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A synthetic diagnostics platform for microwave imaging diagnostics in tokamaks
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作者 李子涵 杨尚川 +5 位作者 徐新航 张立夫 渠承明 李诚普 庄革 谢锦林 《Plasma Science and Technology》 SCIE EI CAS CSCD 2024年第3期38-45,共8页
Interpreting experimental diagnostics data in tokamaks,while considering non-ideal effects,is challenging due to the complexity of plasmas.To address this challenge,a general synthetic diagnostics(GSD)platform has bee... Interpreting experimental diagnostics data in tokamaks,while considering non-ideal effects,is challenging due to the complexity of plasmas.To address this challenge,a general synthetic diagnostics(GSD)platform has been established that facilitates microwave imaging reflectometry and electron cyclotron emission imaging.This platform utilizes plasma profiles as input and incorporates the finite-difference time domain,ray tracing and the radiative transfer equation to calculate the propagation of plasma spontaneous radiation and the external electromagnetic field in plasmas.Benchmark tests for classical cases have been conducted to verify the accuracy of every core module in the GSD platform.Finally,2D imaging of a typical electron temperature distribution is reproduced by this platform and the results are consistent with the given real experimental data.This platform also has the potential to be extended to 3D electromagnetic field simulations and other microwave diagnostics such as cross-polarization scattering. 展开更多
关键词 synthetic diagnostics tokamak plasmas microwave imaging diagnostics microwave imaging reflectometer electron cyclotron emission imaging
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Trends in dentomaxillofacial radiology
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作者 KıvançKamburoğlu 《World Journal of Radiology》 2025年第1期19-31,共13页
Oral and maxillofacial diagnostic imaging is of paramount importance in dental clinical diagnosis,treatment planning,and follow-up procedures.Periapical ra-diographic examination and numerous panoramic systems are use... Oral and maxillofacial diagnostic imaging is of paramount importance in dental clinical diagnosis,treatment planning,and follow-up procedures.Periapical ra-diographic examination and numerous panoramic systems are used in routine clinical dental practice.Cone beam CT is widely used and currently the method of choice in oral and maxillofacial implantology,endodontics,maxillofacial surgery,periodontics,degenerative temporomandibular joint disease,orthodontics,airway studies,sleep disorders,and forensic dentistry.Another innovative laboratory re-search tool that offers three-dimensional(3D)detailed high-resolution images of in vitro teeth and neighboring structures with submicrometric accuracy is micro-computed tomography.Ultra-high radiation doses,long scanning times,and high costs preclude its routine clinical use.In response to the high demand for a te-chnique that could provide real-time images using a cost-effective,rapid,user-friendly,and portable technique without ionizing radiation,some authors pro-posed ultrasound imaging methods as an alternative to X-ray imaging techniques.Ultrasonography can be used in the dentomaxillofacial region for various diagno-stic purposes such as salivary gland and superficial tissue examination.Recently,dedicated dental magnetic resonance imaging with appropriate software,hard-ware,sequences,and field of view tailored to fit dentomaxillofacial anatomy was introduced.Lately,3D printing technologies and their application in dentistry has attracted attention.During 3D printing a given material is added in successive layers to create a 3D object.The application of this technology has the potential to decrease operation time and minimize operator bias and the possibility of proce-dural errors.Another hot topic regarding dentomaxillofacial radiology is artificial intelligence,which is a field related to computer science dedicated to developing systems or machines that can perform tasks traditionally associated with human intelligence.It is obvious that further investigation and research in the field of dentomaxillofacial radiology will make great contributions to diagnostic imaging for various dental specialties. 展开更多
关键词 Dentomaxillofacial radiology Diagnostic imaging Cone beam CT ULTRASONOGRAPHY Microcomputed tomography Dental microcomputed tomography Three-dimensional printing Artificial intelligence
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Portal hypertension: Imaging of portosystemic collateral pathways and associated image-guided therapy 被引量:18
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作者 Murad Feroz Bandali Anirudh Mirakhur +4 位作者 Edward Wolfgang Lee Mollie Clarke Ferris David James Sadler Robin Ritchie Gray Jason Kam Wong 《World Journal of Gastroenterology》 SCIE CAS 2017年第10期1735-1746,共12页
Portal hypertension is a common clinical syndrome, defined by a pathologic increase in the portal venous pressure. Increased resistance to portal blood flow, the primary factor in the pathophysiology of portal hyperte... Portal hypertension is a common clinical syndrome, defined by a pathologic increase in the portal venous pressure. Increased resistance to portal blood flow, the primary factor in the pathophysiology of portal hypertension, is in part due to morphological changes occurring in chronic liver diseases. This results in rerouting of blood flow away from the liver through collateral pathways to low-pressure systemic veins. Through a variety of computed tomographic, sonographic, magnetic resonance imaging and angiographic examples, this article discusses the appearances and prevalence of both common and less common portosystemic collateral channels in the thorax and abdomen. A brief overview of established interventional radiologic techniques for treatment of portal hypertension will also be provided. Awareness of the various imaging manifestations of portal hypertension can be helpful for assessing overall prognosis and planning proper management. 展开更多
关键词 Portal hypertension Diagnostic imaging Portosystemic collaterals Image-guided therapy
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Imaging features of intraductal papillary mucinous neoplasms of the pancreas in multi-detector row computed tomography 被引量:6
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作者 Ling Tan Ya-E Zhao +4 位作者 Deng-Bin Wang Qing-Bing Wang Jing Hu Ke-Min Chen Xia-Xing Deng 《World Journal of Gastroenterology》 SCIE CAS CSCD 2009年第32期4037-4043,共7页
AIM:To retrospectively evaluate the imaging features of pancreatic intraductal papillary mucinous neoplasms (IPMNs) in multi-detector row computed tomography (MDCT).METHODS: A total of 20 patients with pathologically-... AIM:To retrospectively evaluate the imaging features of pancreatic intraductal papillary mucinous neoplasms (IPMNs) in multi-detector row computed tomography (MDCT).METHODS: A total of 20 patients with pathologically-confirmed intraductal papillary mucinous neoplasms (IPMNs) were included in this study. Axial MDCT images combined with CT angiography (CTA) and multiplanar volume reformations (MPVR) or curved reformations (CR) were preoperatively acquired. Two radiologists (Tan L and Wang DB) reviewed all the images in consensus using an interactive picture archiving and communication system. The disputes in readings were resolved through consultation with a third experienced radiologist (Chen KM). Finally, the findings and diagnoses were compared with the pathologic results.RESULTS: The pathological study revealed 12 malignant IPMNs and eight benign IPMNs. The diameters of the cystic lesions and main pancreatic ducts (MPDs) were significantly larger in malignant IPMNs compared with those of the benign IPMNs (P<0.05). The combined-type IPMNs had a higher rate of malignancy than the other two types of IPMNs (P<0.05). Tumors with mural nodules and thick septa had a significantly higher incidence of malignancy than tumors without these features (P<0.05). Communication of side-branch IPMNs with the MPD was present in nine cases at pathologic examination. Seven of them were identified from CTA and MPVR or CR images. From comparison with the pathological diagnosis, the sensitivity, specificity, and accuracy of MDCT in characterizing the malignancy of IPMN of the pancreas were determined to be 100%, 87.5% and 95%, respectively.CONCLUSION: MDCT with CTA and MPVR or CR techniques can elucidate the imaging features of IPMNs and help predict the malignancy of these tumors. 展开更多
关键词 Computed tomography Diagnostic imaging Intraductal papillary mucinous neoplasm PANCREATICNEOPLASMS
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Comparison of imaging-based and pathological dimensions in pancreatic neuroendocrine tumors 被引量:5
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作者 Salvatore Paiella Harmony Impellizzeri +14 位作者 Elisabetta Zanolin Giovanni Marchegiani Marco Miotto Anna Malpaga Riccardo De Robertis Mirko D'Onofrio Borislav Rusev Paola Capelli Sara Cingarlini Giovanni Butturini Maria Vittoria Davì Antonio Amodio Claudio BassiAldo Scarpa Roberto Salvia Luca Landoni 《World Journal of Gastroenterology》 SCIE CAS 2017年第17期3092-3098,共7页
AIM To establish the ability of magnetic resonance(MR) and computer tomography(CT) to predict pathologic dimensions of pancreatic neuroendocrine tumors(Pan NET) in a caseload of a tertiary referral center.METHODS Pati... AIM To establish the ability of magnetic resonance(MR) and computer tomography(CT) to predict pathologic dimensions of pancreatic neuroendocrine tumors(Pan NET) in a caseload of a tertiary referral center.METHODS Patients submitted to surgery for Pan NET at the Surgical Unit of the Pancreas Institute with at least 1 preoperative imaging examination(MR or CT scan) from January 2005 to December 2015 were included and data retrospectively collected. Exclusion criteria were: multifocal lesions, genetic syndromes, microadenomas or mixed tumors, metastatic disease and neoadjuvant therapy. Bland-Altman(BA) and Mountain-Plot(MP) statistics were used to compare size measured by each modality with the pathology size. Passing-Bablok(PB) regression analysis was used to check the agreement between MR and CT.RESULTS Our study population consisted of 292 patients. Seventy-nine(27.1%) were functioning Pan NET. The mean biases were 0.17 ± 7.99 mm, 1 ± 8.51 mm and 0.23 ± 9 mm, 1.2 ± 9.8 mm for MR and CT, considering the overall population and the subgroup of non-functioning-Pan NET, respectively. Limits of agreement(LOA) included the vast majority of observations, indicating a good agreement between imaging and pathology. The MP further confirmed this finding and showed that the two methods are unbiased with respect to each other. Considering ≤ 2 cm non-functioning-Pan NET, no statistical significance was found in the size estimation rate of MR and CT(P = 0.433). PBR analysis did not reveal significant differences between MR, CT and pathology.CONCLUSION MR and CT scan are accurate and interchangeable imaging techniques in predicting pathologic dimensions of Pan NET. 展开更多
关键词 Pancreatic neoplasms Neuroendocrine tumors Magnetic resonance imaging Diagnostic imaging Pathological dimensions
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Potential role of imaging in assessing harmful effects on spermatogenesis in adult testes with varicocele 被引量:5
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作者 Athina C Tsili Olga N Xiropotamou +3 位作者 Anastasios Sylakos Vasilios Maliakas Nikolaos Sofikitis Maria I Argyropoulou 《World Journal of Radiology》 CAS 2017年第2期34-45,共12页
Varicocele is characterized by an abnormal dilatation and retrograde blood flow in the spermatic veins. Varicocele is the leading correctable cause of male infertility. Although it is highly prevalent in infertile men... Varicocele is characterized by an abnormal dilatation and retrograde blood flow in the spermatic veins. Varicocele is the leading correctable cause of male infertility. Although it is highly prevalent in infertile men, it is also observed in individuals with normal fertility. Determining which men are negatively affected by varicocele would enable clinicians to better select those men who will benefit from treatment. To assess the functional status of the testes in men with varicocele, color Doppler sonographic parameters were evaluated. Testicular arterial blood flow was significantly reduced in men with varicocele, reflecting an impairment of spermatogenesis. An improvement in the testicular blood supply was found after varicocelectomy on spectral Doppler analysis. Testicular contrast harmonic imaging and elastography might improve our knowledge about the influence of varicocele on intratesticular microcirculation and tissue stiffness, respectively, providing possible information on the early damage of testicular structure by varicocele. Magnetic resonance imaging(MRI), with measurement of apparent diffusion coefficient has been used to assess the degree of testicular dysfunction and to evaluate the effectiveness of varicocele repair. Large prospective studies are needed to validate the possible role of functional sonography and MRI in the assessment of early defects of spermatogenesis in testes with varicocele. 展开更多
关键词 VARICOCELE SPERMATOGENESIS Diagnostic imaging ULTRASONOGRAPHY Doppler ultrasound imaging Magnetic resonance imaging Functional
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Reversible lesions in the brain parenchyma in Wilson's disease confirmed by magnetic resonance imaging:earlier administration of chelating therapy can reduce the damage to the brain 被引量:2
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作者 Dusko B.Kozic Igor Petrovic +3 位作者 Marina Svetel Tatjana Pekmezovic Aleksandar Ragaji Vladimir S.Kostic 《Neural Regeneration Research》 SCIE CAS CSCD 2014年第21期1912-1916,共5页
The aim of this study was to evaluate the resolution of brain lesions in patients with Wilson’s disease during the long-term chelating therapy using magnetic resonance imaging and a possible signiifcance of the time ... The aim of this study was to evaluate the resolution of brain lesions in patients with Wilson’s disease during the long-term chelating therapy using magnetic resonance imaging and a possible signiifcance of the time latency between the initial symptoms of the disease and the introduction of this therapy. Initial magnetic resonance examination was performed in 37 patients with proven neurological form of Wilson’s disease with cerebellar, parkinsonian and dystonic presentation. Magnetic resonance reexamination was done 5.7 ± 1.3 years later in 14 patients. Patients were divided into: group A, where chelating therapy was initiated 〈 24 months from the ifrst symp-toms and group B, where the therapy started≥ 24 months after the initial symptoms. Symmetry of the lesions was seen in 100% of patients. There was a signiifcant difference between groups A and B regarding complete resolution of brain stem and putaminal lesions (P= 0.005 andP=0.024, respectively). If the correct diagnosis and adequate treatment are not established less than 24 months after onset of the symptoms, irreversible lesions in the brain parenchyma could be ex-pected. Signal abnormalities on magnetic resonance imaging might therefore, at least in the early stages, represent reversible myelinolisis or cytotoxic edema associated with copper toxicity. 展开更多
关键词 nerve regeneration Wilson’s disease diagnostic imaging chelating therapy magnetic resonance imaging delayed diagnosis metabolic disorders copper toxicity hepatic encephalopathy pontine myelinolysis cirrhosis neural regeneration
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Prognostic value of preoperative enhanced computed tomography as a quantitative imaging biomarker in pancreatic cancer 被引量:1
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作者 Jian-Feng Gao Yu Pan +4 位作者 Xian-Chao Lin Feng-Chun Lu Ding-Shen Qiu Jun-Jun Liu He-Guang Huang 《World Journal of Gastroenterology》 SCIE CAS 2022年第22期2468-2481,共14页
BACKGROUND Pancreatic ductal adenocarcinoma(PDAC)is one of the most lethal malignancies with high mortality and short survival time.Computed tomography(CT)plays an important role in the diagnosis,staging and treatment... BACKGROUND Pancreatic ductal adenocarcinoma(PDAC)is one of the most lethal malignancies with high mortality and short survival time.Computed tomography(CT)plays an important role in the diagnosis,staging and treatment of pancreatic tumour.Pancreatic cancer generally shows a low enhancement pattern compared with normal pancreatic tissue.AIM To analyse whether preoperative enhanced CT could be used to predict postoperative overall survival in patients with PDAC.METHODS Sixty-seven patients with PDAC undergoing pancreatic resection were enrolled retrospectively.All patients underwent preoperative unenhanced and enhanced CT examination,the CT values of which were measured.The ratio of the preoperative CT value increase from the nonenhancement phase to the portal venous phase between pancreatic tumour and normal pancreatic tissue was calculated.The cut-off value of ratios was obtained by the receiver operating characteristic(ROC)curve of the tumour relative enhancement ratio(TRER),according to which patients were divided into low-and high-enhancement groups.Univariate and multivariate analyses were performed using Cox regression based on TRER grouping.Finally,the correlation between TRER and clinicopathological characteristics was analysed.RESULTS The area under the curve of the ROC curve was 0.768(P<0.05),and the cut-off value of the ROC curve was calculated as 0.7.TRER≤0.7 was defined as the low-enhancement group,and TRER>0.7 was defined as the high-enhancement group.According to the TRER grouping,the Kaplan-Meier survival curve analysis results showed that the median survival(10.0 mo)with TRER≤0.7 was significantly shorter than that(22.0 mo)with TRER>0.7(P<0.05).In the univariate and multivariate analyses,the prognosis of patients with TRER≤0.7 was significantly worse than that of patients with TRER>0.7(P<0.05).Our results demonstrated that patients in the low TRER group were more likely to have higher American Joint Committee on Cancer stage,tumour stage and lymph node stage(all P<0.05),and TRER was significantly negatively correlated with tumour size(P<0.05).CONCLUSION TRER≤0.7 in patients with PDAC may represent a tumour with higher clinical stage and result in a shorter overall survival. 展开更多
关键词 Pancreatic cancer Computed tomography Diagnostic imaging Kaplan-Meier curve PROGNOSIS Survival analysis
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Surgical complications after pancreatic transplantation:A computed tomography imaging pictorial review 被引量:1
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作者 Carlo D'Alessandro Matteo Todisco +4 位作者 Caterina Di Bella Filippo Crimì Lucrezia Furian Emilio Quaia Federica Vernuccio 《World Journal of Gastroenterology》 SCIE CAS 2023年第46期6049-6059,共11页
Pancreatic transplantation is considered by the American Diabetes Association and the European Association for the Study of Diabetes an acceptable surgical procedure in patients with type 1 diabetes also undergoing ki... Pancreatic transplantation is considered by the American Diabetes Association and the European Association for the Study of Diabetes an acceptable surgical procedure in patients with type 1 diabetes also undergoing kidney transplantation in pre-final or end-stage renal disease if no contraindications are present.Pancreatic transplantation,however,is a complex surgical procedure and may lead to a range of postoperative complications that can significantly impact graft function and patient outcomes.Postoperative computed tomography(CT)is often adopted to evaluate perfusion of the transplanted pancreas,identify complications and as a guide for interventional radiology procedures.CT assessment after pancreatic transplantation should start with the evaluation of the arterial Y-graft,the venous anastomosis and the duodenojejunostomy.With regard to complications,CT allows for the identification of vascular complications,such as thrombosis or stenosis of blood vessels supplying the graft,the detection of pancreatic fluid collections,including pseudocysts,abscesses,or leaks,the assessment of bowel complications(anastomotic leaks,ileus or obstruction),and the identification of bleeding.The aim of this pictorial review is to illustrate CT findings of surgical-related complications after pancreatic transplantation.The knowledge of surgical techniques is of key importance to understand postoperative anatomic changes and imaging evaluation.Therefore,we first provide a short summary of the main techniques of pancreatic transplantation.Then,we provide a practical imaging approach to pancreatic transplantation and its complications providing tips and tricks for the prompt imaging diagnosis on CT. 展开更多
关键词 Diabetes mellitus Type 1 Pancreas transplantation COMPLICATIONS Computed tomography Diagnostic imaging
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Multi-Mode Guided Waves Based Reference-Free Damage Diagnostic Imaging in Plates 被引量:1
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作者 Jiaqi Zhang Kehai Liu +3 位作者 Chang Gao Zhanjun Wu Yuebin Zheng Dongyue Gao 《Structural Durability & Health Monitoring》 EI 2019年第1期41-59,共19页
Probability-based diagnostic imaging(PDI)is one of the most well-known damage identification methods using guided waves.It is usually applied to diagnose damage in plates.The previous studies were dependent on the cer... Probability-based diagnostic imaging(PDI)is one of the most well-known damage identification methods using guided waves.It is usually applied to diagnose damage in plates.The previous studies were dependent on the certain damage index(DI)which is always calculated from the guided wave signals.In conventional methods,DI is simply defined by comparing the real-time data with the baseline data as reference.However,the baseline signal is easily affected by varying environmental conditions of structures.In this paper,a reference-free diagnostic imaging method is developed to avoid the influence of environmental factors,such as temperature and load conditions.The DI is defined based on the mode conversion of multi-mode guided waves with realtime signals without baseline signals.To improve the accuracy of diagnosis,two terms are included in the reference-free DI.One is called energy DI,which is defined based on the feature of signal energy.The other is called correlation DI and is defined based on the correlation coefficient.Then the PDI algorithm can be carried out instantaneously according to the reference-free DI.The real-time signals which are used to calculate DI are collected by the piezoelectric lead zirconate titanate(PZT)transducers placed on both sides of a plate.The numerical simulations by the finite element(FE)method on aluminum plates with PZT arrays are performed to validate the effectiveness of the reference-free damage diagnostic imaging.The approach is validated by two different arrays:a circle network and a square network.The results of diagnostic imaging are demonstrated and discussed in this paper.Furthermore,the advantage of reference-free DI is investigated by comparing the accuracy of defined reference-free DI and energy DI. 展开更多
关键词 Multi-mode guided waves probability-based diagnostic imaging referencefree mode conversion
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Imaging presentation of adrenal glands in female pseudohermaphroditism 被引量:1
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作者 王俭 蒋涛 +1 位作者 韩希年 刘光华 《Journal of Medical Colleges of PLA(China)》 CAS 2006年第4期249-253,共5页
Objective: To discuss imaging features of the adrenal glands in female pseudo-hermaphroditism. Methods: 11 cases of female pseudohermaphroditism (8-27 years old) were analyzed retrospectively. Results: In 9 of the 11 ... Objective: To discuss imaging features of the adrenal glands in female pseudo-hermaphroditism. Methods: 11 cases of female pseudohermaphroditism (8-27 years old) were analyzed retrospectively. Results: In 9 of the 11 patients with female pseudohermaphroditism who did no receive hormone replacement therapy, both internal and external branches of bilateral adrenal glands were found to be thickened, prolonged and twisted, and in 2 of the 9 patients they were found to be macronodularly hyperplasic. In one of the remaining two patients who had received long-term hormone replacement therapy, the adrenal glands were not thickened or twisted, though prolonged; and in the other patient imaging presentation of the adrenal glands was the same as that of those who did not receive hormone replacement therapy, but with co-existence of adrenal myelolipoma. Among the 11 patients agenesis of the uterus and the vagina was found in 4 cases. Conclusion: Female pseudohermaphroditism is a hereditary disease, where hyperplasia of the adrenal glands and agenesis of the uterus and the vagina were secondary. Early detection of these abnormalities by imageology would prove to be helpful in early detection and treatment of the condition. 展开更多
关键词 female pseudohermaphroditism adrenal hyperplasia congenital diagnostic imaging
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Advances in application of novel magnetic resonance imaging technologies in liver disease diagnosis
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作者 Yi-Ming Qi En-Hua Xiao 《World Journal of Gastroenterology》 SCIE CAS 2023年第28期4384-4396,共13页
Liver disease is a major health concern globally,with high morbidity and mortality rates.Precise diagnosis and assessment are vital for guiding treatment approaches,predicting outcomes,and improving patient prognosis.... Liver disease is a major health concern globally,with high morbidity and mortality rates.Precise diagnosis and assessment are vital for guiding treatment approaches,predicting outcomes,and improving patient prognosis.Magnetic resonance imaging(MRI)is a non-invasive diagnostic technique that has been widely used for detecting liver disease.Recent advancements in MRI technology,such as diffusion weighted imaging,intravoxel incoherent motion,magnetic resonance elastography,chemical exchange saturation transfer,magnetic resonance spectroscopy,hyperpolarized MR,contrast-enhanced MRI,and radiomics,have significantly improved the accuracy and effectiveness of liver disease diagnosis.This review aims to discuss the progress in new MRI technologies for liver diagnosis.By summarizing current research findings,we aim to provide a comprehensive reference for researchers and clinicians to optimize the use of MRI in liver disease diagnosis and improve patient prognosis. 展开更多
关键词 Diagnostic imaging Liver diseases Fatty liver Liver fibrosis Hepatocellular carcinoma Magnetic resonance imaging
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Case of victims of modern imaging technology:Increased information noise concealing the diagnosis
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作者 Abhishek Mahajan G V Santhoshkumar +4 位作者 Ameya Shirish Kawthalkar Richa Vaish Nilesh Sable Supreeta Arya Subhash Desai 《World Journal of Radiology》 CAS 2017年第12期454-458,共5页
We present a case of tubercular arthritis who underwent numerous unnecessary investigations what is known as "victims of modern imaging technology" or VOMIT. Today there is an exponential rise in the volume ... We present a case of tubercular arthritis who underwent numerous unnecessary investigations what is known as "victims of modern imaging technology" or VOMIT. Today there is an exponential rise in the volume of the medical imaging, part of which is contributed by unnecessary and unjustified indications. We discuss about the untoward effects of the uninhibited and careless use of modern imaging modalities and possible ways to avoid. Skeletal manifestation of the tuberculosis is still common in the endemic countries like India. Although the final diagnosis of the skeletal tuberculosis like tubercular arthritis is made by bacteriological and histological studies, few demographic, clinical and radiological features might help making early diagnosis. 展开更多
关键词 RADIOLOGY Modern imaging Patient care Healthcare costs Tubercular arthritis Diagnostic imaging overuse
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Hepatobiliary phases in magnetic resonance imaging using liverspecific contrast for focal lesions in clinical practice
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作者 Daniel Alvarenga Fernandes Eduardo Andreazza Dal Lago +10 位作者 Felipe Aguera Oliver Bruna Melo Coelho Loureiro Daniel Lahan Martins Thiago José Penachim Ricardo Hoelz de Oliveira Barros José de ArimatéiaBatista Araújo Filho Larissa Bastos Eloy da Costa Áurea Maria Oliveira da Silva Elaine Cristina de Ataíde Ilka de Fátima Santana Ferreira Boin Nelson Marcio Gomes Caserta 《World Journal of Hepatology》 2022年第7期1459-1469,共11页
BACKGROUND Challenging lesions,difficult to diagnose through non-invasive methods,constitute an important emotional burden for each patient regarding a still uncertain diagnosis(malignant x benign).In addition,from a ... BACKGROUND Challenging lesions,difficult to diagnose through non-invasive methods,constitute an important emotional burden for each patient regarding a still uncertain diagnosis(malignant x benign).In addition,from a therapeutic and prognostic point of view,delay in a definitive diagnosis can lead to worse outcomes.One of the main innovative trends currently is the use of molecular and functional methods to diagnosis.Numerous liver-specific contrast agents havebeen developed and studied in recent years to improve the performance of liver magnetic resonance imaging(MRI).More recently,one of the contrast agents introduced in clinical practice is gadoxetic acid(gadoxetate disodium).AIM To demonstrate the value of the hepatobiliary phases using gadoxetic acid in MRI for the characterization of focal liver lesions(FLL)in clinical practice.METHODS Overall,302 Lesions were studied in 136 patients who underwent MRI exams using gadoxetic acid for the assessment of FLL.Two radiologists independently reviewed the MRI exams using four stages,and categorized them on a 6-point scale,from 0(lesion not detected)to 5(definitely malignant).The stages were:stage 1-images without contrast,stage 2-addition of dynamic phases after contrast(analogous to usual extracellular contrasts),stage 3-addition of hepatobiliary phase after 10 min(HBP 10’),stage 4-hepatobiliary phase after 20 min(HBP 20’)in addition to stage 2.RESULTS The interobserver agreement was high(weighted Kappa coefficient:0.81-1)at all stages in the characterization of benign and malignant FLL.The diagnostic weighted accuracy(Az)was 0.80 in stage 1 and was increased to 0.90 in stage 2.Addition of the hepatobiliary phase increased Az to 0.98 in stage 3,which was also 0.98 in stage 4.CONCLUSION The hepatobiliary sequences improve diagnostic accuracy.With growing potential in the era of precision medicine,the improvement and dissemination of the method among medical specialties can bring benefits in the management of patients with FLL that are difficult to diagnose. 展开更多
关键词 LIVER Liver neoplasms Liver transplantation Medical oncology Diagnostic imaging Magnetic resonance imaging
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COVID-19 imaging:Diagnostic approaches,challenges,and evolving advances
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作者 Dante L Pezzutti Vibhor Wadhwa Mina S Makary 《World Journal of Radiology》 2021年第6期171-191,共21页
The role of radiology and the radiologist have evolved throughout the coronavirus disease-2019(COVID-19)pandemic.Early on,chest computed tomography was used for screening and diagnosis of COVID-19;however,it is now in... The role of radiology and the radiologist have evolved throughout the coronavirus disease-2019(COVID-19)pandemic.Early on,chest computed tomography was used for screening and diagnosis of COVID-19;however,it is now indicated for high-risk patients,those with severe disease,or in areas where polymerase chain reaction testing is sparsely available.Chest radiography is now utilized mainly for monitoring disease progression in hospitalized patients showing signs of worsening clinical status.Additionally,many challenges at the operational level have been overcome within the field of radiology throughout the COVID-19 pandemic.The use of teleradiology and virtual care clinics greatly enhanced our ability to socially distance and both are likely to remain important mediums for diagnostic imaging delivery and patient care.Opportunities to better utilize of imaging for detection of extrapulmonary manifestations and complications of COVID-19 disease will continue to arise as a more detailed understanding of the pathophysiology of the virus continues to be uncovered and identification of predisposing risk factors for complication development continue to be better understood.Furthermore,unidentified advancements in areas such as standardized imaging reporting,point-of-care ultrasound,and artificial intelligence offer exciting discovery pathways that will inevitably lead to improved care for patients with COVID-19. 展开更多
关键词 COVID-19 CORONAVIRUS PANDEMIC Diagnostic imaging RADIOGRAPHY Computed tomography OUTCOMES Future trends
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Imaging in the COVID-19 era:Lessons learned during a pandemic
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作者 Georgios Antonios Sideris Melina Nikolakea +3 位作者 Aikaterini-Eleftheria Karanikola Sofia Konstantinopoulou Dimitrios Giannis Lucy Modahl 《World Journal of Radiology》 2021年第6期192-222,共31页
The first year of the coronavirus disease 2019(COVID-19)pandemic has been a year of unprecedented changes,scientific breakthroughs,and controversies.The radiology community has not been spared from the challenges impo... The first year of the coronavirus disease 2019(COVID-19)pandemic has been a year of unprecedented changes,scientific breakthroughs,and controversies.The radiology community has not been spared from the challenges imposed on global healthcare systems.Radiology has played a crucial part in tackling this pandemic,either by demonstrating the manifestations of the virus and guiding patient management,or by safely handling the patients and mitigating transmission within the hospital.Major modifications involving all aspects of daily radiology practice have occurred as a result of the pandemic,including workflow alterations,volume reductions,and strict infection control strategies.Despite the ongoing challenges,considerable knowledge has been gained that will guide future innovations.The aim of this review is to provide the latest evidence on the role of imaging in the diagnosis of the multifaceted manifestations of COVID-19,and to discuss the implications of the pandemic on radiology departments globally,including infection control strategies and delays in cancer screening.Lastly,the promising contribution of artificial intelligence in the COVID-19 pandemic is explored. 展开更多
关键词 COVID-19 Infectious diseases Diagnostic imaging RADIOGRAPHY Computed tomography Artificial intelligence
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Imaging of paraduodenal pancreatitis:A systematic review
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作者 Matteo Bonatti NicolòDe Pretis +6 位作者 Giulia A Zamboni Alessandro Brillo Stefano Francesco Crinò Riccardo Valletta Fabio Lombardo Giancarlo Mansueto Luca Frulloni 《World Journal of Radiology》 2023年第2期42-55,共14页
BACKGROUND Paraduodenal pancreatitis(PP)represents a diagnostic challenge,especially in non-referral centers,given its potential imaging overlap with pancreatic cancer.There are two main histological variants of PP,th... BACKGROUND Paraduodenal pancreatitis(PP)represents a diagnostic challenge,especially in non-referral centers,given its potential imaging overlap with pancreatic cancer.There are two main histological variants of PP,the cystic and the solid,with slightly different imaging appearances.Moreover,imaging findings in PP may change over time because of disease progression and/or as an effect of its risk factors exposition,namely alcohol intake and smoking.AIM To describe multimodality imaging findings in patients affected by PP to help clinicians in the differential diagnosis with pancreatic cancer.METHODS The systematic review was conducted according to the Preferred Reporting Items for Systematic reviews and Meta-analyses 2009 guidelines.A Literature search was performed on PubMed,Embase and Cochrane Library using(groove pancreatitis[Title/Abstract])OR(PP[Title/Abstract])as key words.A total of 593 articles were considered for inclusion.After eliminating duplicates,and title and abstract screening,53 full-text articles were assessed for eligibility.Eligibility criteria were:Original studies including 8 or more patients,fully written in English,describing imaging findings in PP,with pathological confirmation or clinical-radiological follow-up as the gold standard.Finally,14 studies were included in our systematic review.RESULTS Computed tomography(CT)findings were described in 292 patients,magnetic resonance imaging(MRI)findings in 231 and endoscopic ultrasound(EUS)findings in 115.Duodenal wall thickening was observed in 88.8%of the cases:Detection rate was 96.5%at EUS,91.0%at MRI and 84.1%at CT.Second duodenal portion increased enhancement was recognizable in 76.3%of the cases:Detection rate was 84.4%at MRI and 72.1%at CT.Cysts within the duodenal wall were detected in 82.6%of the cases:Detection rate was 94.4%at EUS,81.9%at MRI and 75.7%at CT.A solid mass in the groove region was described in 40.9%of the cases;in 78.3%of the cases,it showed patchy enhancement in the portal venous phase,and in 100%appeared iso/hyperintense during delayed phase imaging.Only 3.6%of the lesions showed restricted diffusion.The prevalence of radiological signs of chronic obstructive pancreatitis,namely main pancreatic duct dilatation,pancreatic calcifications,and pancreatic cysts,was extremely variable in the different articles.CONCLUSION PP has peculiar imaging findings.MRI is the best radiological imaging modality for diagnosing PP,but EUS is more accurate than MRI in depicting duodenal wall alterations. 展开更多
关键词 PANCREATITIS Paraduodenal pancreatitis Diagnostic imaging Computed tomography Magnetic resonance imaging Endoscopic ultrasound
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Liver volumetric and anatomic assessment in living donor liver transplantation: The role of modern imaging and artificial intelligence
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作者 Mayara Machry Luis Fernando Ferreira +2 位作者 Angelica Maria Lucchese Antonio Nocchi Kalil Flavia Heinz Feier 《World Journal of Transplantation》 2023年第6期290-298,共9页
The shortage of deceased donor organs has prompted the development of alternative liver grafts for transplantation.Living-donor liver transplantation(LDLT)has emerged as a viable option,expanding the donor pool and en... The shortage of deceased donor organs has prompted the development of alternative liver grafts for transplantation.Living-donor liver transplantation(LDLT)has emerged as a viable option,expanding the donor pool and enabling timely transplantation with favorable graft function and improved long-term outcomes.An accurate evaluation of the donor liver’s volumetry(LV)and anatomical study is crucial to ensure adequate future liver remnant,graft volume and precise liver resection.Thus,ensuring donor safety and an appropriate graftto-recipient weight ratio.Manual LV(MLV)using computed tomography has traditionally been considered the gold standard for assessing liver volume.However,the method has been limited by cost,subjectivity,and variability.Automated LV techniques employing advanced segmentation algorithms offer improved reproducibility,reduced variability,and enhanced efficiency compared to manual measurements.However,the accuracy of automated LV requires further investigation.The study provides a comprehensive review of traditional and emerging LV methods,including semi-automated image processing,automated LV techniques,and machine learning-based approaches.Additionally,the study discusses the respective strengths and weaknesses of each of the aforementioned techniques.The use of artificial intelligence(AI)technologies,including machine learning and deep learning,is expected to become a routine part of surgical planning in the near future.The implementation of AI is expected to enable faster and more accurate image study interpretations,improve workflow efficiency,and enhance the safety,speed,and cost-effectiveness of the procedures.Accurate preoperative assessment of the liver plays a crucial role in ensuring safe donor selection and improved outcomes in LDLT.MLV has inherent limitations that have led to the adoption of semi-automated and automated software solutions.Moreover,AI has tremendous potential for LV and segmentation;however,its widespread use is hindered by cost and availability.Therefore,the integration of multiple specialties is necessary to embrace technology and explore its possibilities,ranging from patient counseling to intraoperative decision-making through automation and AI. 展开更多
关键词 Liver transplantation Living-donor Diagnostic imaging Artificial intelligence Machine learning Deep learning
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Progresses of Functional Magnetic Resonance Imaging Diagnosis in Breast Cancer
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作者 Qianfei Hu Sibin Liu 《Yangtze Medicine》 2020年第2期85-96,共12页
Breast cancer is the most common malignant tumor that threatens women’s health. Breast magnetic resonance imaging (MRI) is a commonly used method recommended for the diagnosis of breast cancer. Diffusion weighted ima... Breast cancer is the most common malignant tumor that threatens women’s health. Breast magnetic resonance imaging (MRI) is a commonly used method recommended for the diagnosis of breast cancer. Diffusion weighted imaging (DWI) and dynamic enhanced magnetic resonance imaging (DCE-MRI) are now widely used. At present, with the continuous advancement of magnetic resonance technology, Magnetic resonance spectroscopy (MRS), Perfusion weighted imaging (PWI), Positron emission tomography-magnetic resonance imaging (PET-MRI) and so on are gradually being used in clinical practice. Mammography imaging and imaging genomics are hot topics. This article will briefly introduce several functional magnetic resonance techniques and their latest applications. 展开更多
关键词 Breast Cancer Functional Magnetic Resonance Techniques Diagnostic imaging
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Standard diagnostic report of medical imaging
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作者 Sanawar Abbas Radhi Mohammed LIU Wenya 《新疆医科大学学报》 CAS 2013年第5期710-714,共5页
1 BackgroundIt is well known that the radiology diagnostic report as the essential component of the patient′s permanent health record,which radiography is an indispensable diagnostic tool.Our duties are observe the i... 1 BackgroundIt is well known that the radiology diagnostic report as the essential component of the patient′s permanent health record,which radiography is an indispensable diagnostic tool.Our duties are observe the imaging carefully and write a 展开更多
关键词 Standard diagnostic report of medical imaging
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