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Application of CD34 expression combined with three-phase dynamic contrast-enhanced computed tomography scanning in preoperative staging of gastric cancer 被引量:1
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作者 Hua Liu Kang-Yan Zhao 《World Journal of Gastrointestinal Surgery》 SCIE 2023年第11期2513-2524,共12页
BACKGROUND Accurate preoperative staging of gastric cancer(GC),a common malignant tumor worldwide,is critical for appropriate treatment plans and prognosis.Dynamic three-phase enhanced computed tomography(CT)scanning ... BACKGROUND Accurate preoperative staging of gastric cancer(GC),a common malignant tumor worldwide,is critical for appropriate treatment plans and prognosis.Dynamic three-phase enhanced computed tomography(CT)scanning for preoperative staging of GC has limitations in evaluating tumor angiogenesis.CD34,a marker on vascular endothelial cell surfaces,is promising in evaluating tumor angiogenesis.We explored the value of their combination for preoperative staging of GC to improve the efficacy and prognosis of patients with GC.Medical records of 106 patients with GC treated at the First People's Hospital of Lianyungang between February 2021 and January 2023 were retrospectively studied.All patients underwent three-phase dynamic contrast-enhanced CT scanning before surgery,and CD34 was detected in gastroscopic biopsy specimens.Using surgical and pathological results as the gold standard,the diagnostic results of three-phase dynamic contrast-enhanced CT scanning at different T and N stages were analyzed,and the expression of CD34-marked microvessel density(MVD)at different T and N stages was determined.The specificity and sensitivity of three-phase dynamic contrast-enhanced CT and CD34 in T and N staging were calculated;those of the combined diagnosis of the two were evaluated in parallel.Independent factors affecting lymph node metastasis were analyzed using multiple logistic regression.RESULTS The accuracy of three-phase dynamic contrast-enhanced CT scanning in diagnosing stages T1,T2,T3 and T4 were 68.00%,75.00%,79.41%,and 73.68%,respectively,and for diagnosing stages N0,N1,N2,and N3 were 75.68%,74.07%,85.00%,and 77.27%,respectively.CD34-marked MVD expression increased with increasing T and N stages.Specificity and sensitivity of three-phase dynamic contrast-enhanced CT in T staging were 86.79%and 88.68%;for N staging,89.06%and 92.86%;for CD34 in T staging,64.15%and 88.68%;and for CD34 in N staging,84.38%and 78.57%,respectively.Specificity and sensitivity of joint diagnosis in T staging were 55.68%and 98.72%,and N staging were 75.15%and 98.47%,respectively,with the area under the curve for diagnosis improving accordingly.According to multivariate analysis,a longer tumor diameter,higher pathological T stage,lower differ-entiation degree,and higher expression of CD34-marked MVD were independent risk factors for lymph node metastasis in patients with GC.CONCLUSION With high accuracy in preoperatively determining the invasion depth and lymph node metastasis of GC,CD34 expression and three-phase dynamic contrast-enhanced CT can provide a reliable basis for surgical resection. 展开更多
关键词 CD34 three-phase dynamic contrast-enhanced computed tomography scanning Gastric cancer Preoperative staging INVASION Lymph node metastasis
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Effect of confinement on the three-phase equilibrium of water-oil-CO_(2)mixtures in nanopores 被引量:3
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作者 Yi-Lei Song Shao-Hua Gu +3 位作者 Zhao-Jie Song Zhuo-Ya Zhang Xu-Ya Chang Jia Guo 《Petroleum Science》 SCIE CAS CSCD 2022年第1期203-210,共8页
Accurate characterization of fluid phase behavior is an important aspect of CO_(2) enhanced shale oil recovery.So far,however,there has been little discussion about the nanopore confinement effect,including adsorption... Accurate characterization of fluid phase behavior is an important aspect of CO_(2) enhanced shale oil recovery.So far,however,there has been little discussion about the nanopore confinement effect,including adsorption and capillarity on the phase equilibrium of water-oil-CO_(2) mixtures.In this study,an improved three-phase flash algorithm is proposed for calculating the phase behavior of water-oil-gas mixture on the basis of an extended Young-Laplace equation and a newly developed fugacity calculation model.The fugacity model can consider the effect of water-oil-gas adsorption on phase equilibrium.A water-Bakken oil-CO_(2) mixture is utilized to verify the accuracy of the flash algorithm and investigate the confinement effect.Results show that the confinement effect promotes the transfer of all components in the vapor phase to other phases,while the transfer of water,CO_(2),and lighter hydrocarbons is more significant.This leads to a large decrease,a large increase,and a small increase in the mole fraction of the vapor,oleic,and aqueous phases,respectively.When the confinement effect is considered,the density difference of vaporoleic phases decreases,and the interfacial tension of vapor-oleic phases decreases;however,the density difference of vapor-aqueous phases increases,the interfacial tension of vapor-aqueous phases still decreases. 展开更多
关键词 three-phase behavior Water-oil-CO_(2)mixtures Nanopore confinement CO_(2)enhanced oil recovery Shale reservoirs
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A Text Image Watermarking Algorithm Based on Image Enhancement 被引量:1
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作者 Baowei Wang Luyao Shen +2 位作者 Junhao Zhang Zenghui Xu Neng Wang 《Computers, Materials & Continua》 SCIE EI 2023年第10期1183-1207,共25页
Digital watermarking technology is adequate for copyright protection and content authentication.There needs to be more research on the watermarking algorithm after printing and scanning.Aiming at the problem that exis... Digital watermarking technology is adequate for copyright protection and content authentication.There needs to be more research on the watermarking algorithm after printing and scanning.Aiming at the problem that existing anti-print scanning text image watermarking algorithms cannot take into account the invisibility and robustness of the watermark,an anti-print scanning watermarking algorithm suitable for text images is proposed.This algorithm first performs a series of image enhancement preprocessing operations on the printed scanned image to eliminate the interference of incorrect bit information on watermark embedding and then uses a combination of Discrete Wavelet Transform(DWT)-Singular Value Decomposition(SVD)to embed the watermark.Experiments show that the average Normalized Correlation(NC)of the watermark extracted by this algorithm against attacks such as Joint Photographic Experts Group(JPEG)compression,JPEG2000 compression,and print scanning is above 0.93.Especially,the average NC of the watermark extracted after print scanning attacks is greater than 0.964,and the average Bit Error Ratio(BER)is 5.15%.This indicates that this algorithm has strong resistance to various attacks and print scanning attacks and can better take into account the invisibility of the watermark. 展开更多
关键词 Print-resistant scanning image enhancement DWT SVD embedding intensity
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Study of Scanning Dose Optimization on Chest and Abdomen Enhanced CT Imaging
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作者 Zhiwei Huang Lisha Zhong +1 位作者 Bo Xiao Gaofei Cao 《Journal of Signal and Information Processing》 2013年第2期145-148,共4页
Objective: To investigate the correlation between radiation dose and radiation risk when patients are scanned by 64-slice spiral CT. Materials and Methods: SPSS 17.0 is used statistically for analyzing the patient’s ... Objective: To investigate the correlation between radiation dose and radiation risk when patients are scanned by 64-slice spiral CT. Materials and Methods: SPSS 17.0 is used statistically for analyzing the patient’s scanning parameters, radiation dose of monitoring and examining the patients who are scanning of their abdomen, chest and pelvic in our affiliated hospital. Results: SPSS statistical analysis shows that the factor related to radiation dose is scanning layer;the basic characteristics such as height and heart rate don’t affect the patient’s scan dose directly. Conclusion: Increasing the delay time after injection can reduce the scan numbers and monitoring layers of the machine, thus reduce the patient’s radiation dose and tube’s exposure time. 展开更多
关键词 enhancED CT scan scanNING Technology Parameters DOSE Monitoring Radiation DOSE
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Correlation between CT dynamic enhanced scanning parameters and serum tumor markers before and after radiofrequency ablation in patients with lung cancer
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作者 Yi Wang Xu Liang Rui-Yu Zhan 《Journal of Hainan Medical University》 2020年第22期19-23,共5页
Objective:To study the correlation between CT dynamic enhanced scanning parameters and serum tumor markers before and after radiofrequency ablation in patients with lung cancer.Methods:60 patients with advanced non-sm... Objective:To study the correlation between CT dynamic enhanced scanning parameters and serum tumor markers before and after radiofrequency ablation in patients with lung cancer.Methods:60 patients with advanced non-small cell lung cancer who were treated in this hospital between January 2015 and January 2017 were divided into control group(n=30)and observation group(n=30)by random number table method.Control group received conventional intravenous chemotherapy,and observation group received intravenous chemotherapy combined with radiofrequency ablation.The differences in CT dynamic enhanced scanning parameter levels and serum tumor marker contents were compared between the two groups of patients before and after treatment.Pearson test was used to evaluate the correlation between CT dynamic enhanced scanning parameters and serum tumor marker contents in patients with advanced non-small cell lung cancer.Results:Before treatment,the differences in CT dynamic enhanced scanning parameter levels,non-organ-specific tumor marker contents and vascular tumor marker contents were not statistically significant between the two groups of patients(P>0.05).After treatment,CT dynamic enhanced scanning parameters PH and perfusion value levels of observation group were lower than those of control group(P<0.05);serum non-organ specific tumor markers CA125,CA153,CEA and CYFRA21-1 contents of observation group were lower than those of control group;serum vascular tumor markers VEGF,Ang-2,HIF-1 and MMP-9 contents were lower than those of control group(P<0.05).Pearson test showed that CT dynamic enhanced scanning parameters PH and perfusion value levels in patients with non-small cell lung cancer were positively correlated with serum non-organ specific tumor marker and vascular tumor marker contents.Conclusion:Adjuvant radiofrequency ablation can significantly reduce the tumor malignancy of patients with advanced non-small cell lung cancer. 展开更多
关键词 Lung cancer Radiofrequency ablation CT dynamic enhanced scanning Tumor marker
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Diagnostic value of MSCT plain scan and dual-phase enhanced scan in thymic adenocarcinoma
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作者 Bing Liu Xiao-Feng Yang +5 位作者 Ting Sun Shui-Xiang Di Jiang-Hua Su Xiu-Zhong Wang Ning Song Yu-Fang He 《Journal of Hainan Medical University》 2019年第7期65-68,共4页
Objective: To evaluate the value of MSCT plain scan and enhanced CT in the diagnosis of thymic adenocarcinoma. Methods: From May 2013 to June 2018, 37 cases of MSCT plain scan and dual-phase enhanced scan of thymic ad... Objective: To evaluate the value of MSCT plain scan and enhanced CT in the diagnosis of thymic adenocarcinoma. Methods: From May 2013 to June 2018, 37 cases of MSCT plain scan and dual-phase enhanced scan of thymic adenocarcinoma were retrospectively analyzed. The location, shape, size, density (CT value), enhanced features, peripheral invasion and mediastinal lymph node metastasis of the lesions were observed. Results: All 37 cases of thymic adenocarcinoma were diagnosed by CT before operation, and all cases were diagnosed by pathology after operation as malignant tumors,including 28 cases of thoracic adenocarcinoma and 9 cases of invasive thymoma. All 28 cases of thymic adenocarcinoma were single lesion of anterior superior mediastinum. The maximum cross-section was located in the midline in 7 cases and on the mediastinal side in 21 cases with significant difference (P<0.05). All lesions were irregular lobulated. The minimum diameter of lesions was 2.1 cm and the maximum diameter was 8.6 cm. Soft tissue density was dominant in the solid part. All cases of thymic adenocarcinoma showed inhomogeneous, moderate and severe enhancement in the arterial and venous phase after enhancement. The degree of enhancement in the venous phase was higher than that in the arterial phase, and there was no enhancement in the irregular liquefied necrosis area. 26 cases had necrotic lesions, 21 cases had mediastinal lymph node metastasis, and 8 cases had invasion of adjacent pleura. 19 cases had mediastinal vessels and 0 cases had distant pleural metastases. Conclusion: MSCT plain scan combined with dual-phase enhanced CT is helpful to display the details and metastasis of thymic adenocarcinoma, improve the coincidence rate of CT diagnosis and pathological diagnosis, and reduce the misdiagnosis rate. To provide help for clinical diagnosis and treatment of thymic adenocarcinoma. 展开更多
关键词 THYMIC cancer COMPUTED tomography PLAIN and DUAL-PHASE enhanced scanning COMPUTER-ASSISTED imaging
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Observations on the Diagnostic Effects of CT Examination(Enhanced Scan)on Hemorrhage Corpus Luteum Cyst
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作者 Xiang Gao Heng Tang +3 位作者 Lianglong Wu Zou Mei Liangjin Liu Junying Bi 《Proceedings of Anticancer Research》 2020年第6期49-52,共4页
Objective:To investigate the diagnostic effects of enhanced CT scan on hemorrhage corpus luteum cyst(HCLC).Methods:The clinical data of 24 patients with hemorrhage corpus luteum cyst diagnosed by surgery and pathology... Objective:To investigate the diagnostic effects of enhanced CT scan on hemorrhage corpus luteum cyst(HCLC).Methods:The clinical data of 24 patients with hemorrhage corpus luteum cyst diagnosed by surgery and pathology in our hospital were collected.All patients received enhanced CT scan to evaluate the diagnostic value of CT.Results:The average diameter of the cysts in this group of patients was 5.1cm by CT.Further detection of the ruptured cyst wall showed that there was a liquid lowdensity shadow.Some of the cysts were accompanied by signs of increased density,indicating the presence of blood clots;all patients received surgical treatment.Intraoperative ultrasound examination of the cysts had an average diameter of 5.2cm and a wall of 0.2~0.4mm.Among them,19 cases of cysts contained"coffee-colored"liquid with varying degrees of blood clots,and 5 cases had no blood clots in the cysts but there were a lot of blood clots beside the cysts.Conclusion:The application of enhanced CT scan in patients with hemorrhage corpus luteum cyst is of great value.It can provide accurate data reference for clinical treatment and is worthy of promoting its clinical application. 展开更多
关键词 enhanced CT scan Hemorrhage corpus luteum cyst Diagnostic effects
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Diagnostic Value of Spiral CT Chest Enhanced Scan in Adult with Active Pulmonary Tuberculosis
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作者 Ruishu Wang 《Journal of Clinical and Nursing Research》 2020年第3期1-4,共4页
Aim:To explore the diagnostic value of spiral CT chest enhanced scan for adults with active pulmonary tuberculosis.Methods:The clinical data of 60 adult patients with active pulmonary tuberculosis who were treated in ... Aim:To explore the diagnostic value of spiral CT chest enhanced scan for adults with active pulmonary tuberculosis.Methods:The clinical data of 60 adult patients with active pulmonary tuberculosis who were treated in our hospital from January 2018 to November 2019 were retrospectively analyzed.All patients underwent conventional chest radiography and spiral CT chest enhanced scan.The number of tuberculosis diagnosis,the detection rate of special site lesions,and the detection rate of active pulmonary tuberculosis signs by the two methods were compared.Results:In 60 patients,the pathological results confirmed the existence of 75 tuberculosis lesions.The detection rate of spiral CT was 98.67%,which was not statistically significant compared with the detection rate of 92.00%(P>0.05)in the conventional chest X-ray.The detection rate of spiral CT enhanced scans for tuberculosis lesions in special sites was 100.00%,which was significantly higher than that of conventional chest X-ray of 7.69%,and the accuracy rate of active pulmonary tuberculosis signs was 98.85%higher than that of conventional chest X-ray of 79.31%.P<0.05).The difference was statistically significant(P<0.05).Conclusion:Spiral CT chest enhanced scan can not only find special tuberculosis lesions that cannot be detected by conventional chest radiography,but also accurately determine active pulmonary tuberculosis in adults,which is of high diagnostic value. 展开更多
关键词 Active pulmonary tuberculosis ADULT Spiral CT enhanced scan Signs of active pulmonary tuberculosis
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肺栓塞诊断中多层螺旋CT双期动态增强扫描技术的应用研究
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作者 柴清华 杨瑞 +1 位作者 刘继伟 弓莉 《临床研究》 2025年第1期133-135,共3页
目的 分析研究肺栓塞诊断中应用多层螺旋CT双期动态增强扫描技术的应用价值。方法 选取河南省胸科医院2020年2月至2022年6月收治的50例疑似肺栓塞患者,选择SOMATOM Definition Flash双源CT扫描机开展胸部平扫和肺动脉期、肺静脉期双期... 目的 分析研究肺栓塞诊断中应用多层螺旋CT双期动态增强扫描技术的应用价值。方法 选取河南省胸科医院2020年2月至2022年6月收治的50例疑似肺栓塞患者,选择SOMATOM Definition Flash双源CT扫描机开展胸部平扫和肺动脉期、肺静脉期双期动态增强CT扫描,分析双期动态增强扫描图像;以综合评定结果为金标准,计算双期动态增强CT扫描检查结果。结果 分析多层螺旋CT双期动态增强扫描图像发现,41例患者诊断为肺栓塞,能精确发现145处栓子,其中13处为左右肺动脉主干,57处为叶动脉,55处为段动脉,18处为亚段动脉,2处为亚亚段动脉。50例患者经综合评估,结果为阳性48例,阴性2例,双期动态增强CT扫描检查结果为阳性46例,阴性4例。双期动态增强CT扫描检查敏感度为95.83%(46/48),特异度为100.00(2/2),准确度为96.00%(48/50)。结论 临床诊断肺栓塞时采用多层螺旋CT双期动态增强扫描技术具有显著的检测和诊断效果,准确性、特异性及敏感度均较高,值得应用。 展开更多
关键词 肺栓塞 多层螺旋CT 双期 动态增强扫描技术 应用价值
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MRI动态增强扫描联合DWI检查在原发性肝癌诊断中的效能
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作者 王苗苗 胡爱民 《中国民康医学》 2025年第2期109-111,共3页
目的:观察磁共振成像(MRI)动态增强扫描联合弥散加权成像(DWI)检查在原发性肝癌诊断中的效能。方法:回顾性分析2022年1月至2023年1月于该院就诊的143例疑似原发性肝癌患者的临床资料,均进行MRI动态增强扫描、DWI和病理检查,以病理检查... 目的:观察磁共振成像(MRI)动态增强扫描联合弥散加权成像(DWI)检查在原发性肝癌诊断中的效能。方法:回顾性分析2022年1月至2023年1月于该院就诊的143例疑似原发性肝癌患者的临床资料,均进行MRI动态增强扫描、DWI和病理检查,以病理检查结果为金标准,统计MRI动态增强扫描、DWI单项及联合检查诊断原发性肝癌的结果,并分析其与病理检查结果的一致性,比较MRI动态增强扫描、DWI单项及联合检查在原发性肝癌诊断中的效能。结果:病理检查结果显示,143例疑似原发性肝癌患者中,阳性96例,阴性47例;MRI动态增强扫描检查检出阳性83例,阴性60例,与病理检查诊断原发性肝癌的一致性一般(Kappa=0.689);DWI检查检出阳性86例,阴性57例,与病理检查诊断原发性肝癌的一致性一般(Kappa=0.669);联合检查检出阳性99例,阴性44例,与病理检查诊断原发性肝癌的一致性较高(Kappa=0.855);MRI动态增强扫描联合DWI检查诊断原发性肝癌的灵敏度、准确度、阴性预测值均高于二者单项检查,差异有统计学意义(P<0.05);MRI动态增强扫描、DWI单项及联合检查诊断原发性肝癌的特异度、阳性预测值比较,差异均无统计学意义(P>0.05)。结论:MRI动态增强扫描联合DWI检查在原发性肝癌诊断中的效能高于二者单项检查。 展开更多
关键词 原发性肝癌 磁共振成像 动态增强扫描 弥散加权成像 诊断
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呼吸训练联合共情沟通模式在肝脏MRI增强扫描患者中的应用
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作者 陈柳聪 《中国医学创新》 2025年第2期72-76,共5页
目的:探讨呼吸训练联合共情沟通模式在肝脏磁共振成像(MRI)增强扫描患者中的应用效果。方法:选取2022年9月—2023年8月泉州市第一医院收治的98例行肝脏MRI增强扫描检查患者,以随机数字表法分成干预组(n=49)与对照组(n=49),对照组给予常... 目的:探讨呼吸训练联合共情沟通模式在肝脏磁共振成像(MRI)增强扫描患者中的应用效果。方法:选取2022年9月—2023年8月泉州市第一医院收治的98例行肝脏MRI增强扫描检查患者,以随机数字表法分成干预组(n=49)与对照组(n=49),对照组给予常规干预,干预组给予呼吸训练联合共情沟通模式干预。比较两组检查依从性、检查时间、一次性检查成功率、图像质量、心理状态、护理满意度。结果:干预组检查总依从率、一次性检查成功率、图像合格率均高于对照组,检查时间短于对照组,差异均有统计学意义(P<0.05)。干预后,两组贝克焦虑量表(BAI)、贝克抑郁量表(BDI-Ⅱ)评分均低于干预前,且干预组均低于对照组,差异均有统计学意义(P<0.05)。干预组护理满意度高于对照组,差异有统计学意义(P<0.05)。结论:呼吸训练联合共情沟通模式应用于肝脏MRI增强扫描患者干预中,可缩短检查时间,提高检查依从性、一次性检查成功率及图像质量,改善心理状态,促进护理满意度提升。 展开更多
关键词 肝脏磁共振成像增强扫描 呼吸训练 依从性 图像质量
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基于深度算法的肝外胆管癌术前MRI动态增强扫描自动分期系统的构建及验证
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作者 时金凤 王志芳 《齐齐哈尔医学院学报》 2025年第2期141-146,共6页
目的基于深度学习算法构建肝外胆管癌(ECC)术前磁共振成像(MRI)动态增强扫描自动分期系统,并验证其效能。方法回顾性分析2020年1月-2022年12月本院收治的270例ECC患者的临床资料,作为训练集,收集其经MRI动态增强扫描获得的肿瘤位置、侵... 目的基于深度学习算法构建肝外胆管癌(ECC)术前磁共振成像(MRI)动态增强扫描自动分期系统,并验证其效能。方法回顾性分析2020年1月-2022年12月本院收治的270例ECC患者的临床资料,作为训练集,收集其经MRI动态增强扫描获得的肿瘤位置、侵犯范围、淋巴结转移等特征,基于深度学习算法对不同临床分期的ECC进行分类建模,构建ECC术前MRI动态增强扫描自动分期系统。另回顾性分析2023年1-12月本院收治的94例ECC患者临床资料作为验证集,以病理学诊断的临床分期结果作为金标准,分析基于深度算法的ECC术前MRI动态增强扫描自动分期系统对患者临床分期的诊断效能。结果基于深度学习算法的ECC术前MRI动态增强扫描自动分期系统对临床分期Ⅰ期、Ⅱ期、Ⅲ期、Ⅳ期的诊断灵敏度(100.00%、93.33%、97.78%、100.00%)、特异度(100.00%、98.44%、95.92%、100.00%)和准确度(100%、96.81%、96.81%、100.00%)高于MRI动态增强扫描检查方式(灵敏度:91.67%、86.67%、88.89%、85.71%,特异度:97.56%、90.63%、93.88%、100.00%,准确度:96.81%、89.36%、91.49%、98.94%),且与病理学结果的一致性高(Kappa=0.885,P<0.001),MRI动态增强扫描检查方式与病理学结果也存在一致性(Kappa=0.691,P<0.001)。结论基于深度学习算法构建的ECC术前MRI动态增强扫描自动分期系统可提高对ECC术前分期的诊断敏感度、特异度和准确度。 展开更多
关键词 深度学习算法 肝外胆管癌 磁共振成像 动态增强扫描
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强化多期动态CT增强扫描应用在孤立性肺结节诊断中的效能分析
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作者 崔松伟 《临床研究》 2025年第2期151-153,共3页
目的分析强化多期动态CT增强扫描应用在孤立性肺结节(SPN)诊断中的效能。方法选取洛阳市孟津区吉利人民医院2020年1月至2024年10月收治的81例SPN患者为对象,所有患者均行常规CT及多期动态CT增强扫描,以手术病理诊断为金标准,分析其相关... 目的分析强化多期动态CT增强扫描应用在孤立性肺结节(SPN)诊断中的效能。方法选取洛阳市孟津区吉利人民医院2020年1月至2024年10月收治的81例SPN患者为对象,所有患者均行常规CT及多期动态CT增强扫描,以手术病理诊断为金标准,分析其相关数据。结果81例SPN患者中,恶性55例,良性26例。其中恶性患者包括鳞癌20例,类癌2例,小细胞癌6例,腺癌19例,支气管肺泡癌6例,大细胞癌2例。良性患者包括炎性结节15例,结核球6例,腺瘤2例,炎性肌纤维母细胞瘤2例,硬化型血管瘤1例。常规CT诊断结果为阳性47例,阴性34例,与病理诊断一致性较差(Kappa=0.068);多期动态CT增强诊断结果为阳性53例,阴性34例,与病理诊断的一致性较好(Kappa=0.897)。多期动态CT增强检查的敏感度、准确性、特异性、阳性预测值、阴性预测值均高于常规CT,差异有统计学意义(P<0.05)。多期动态CT增强扫描圆形/类圆形、不规则形、分叶、毛刺、清晰、模糊、血管集束征、胸膜凹陷征均高于常规CT,差异有统计学意义(P<0.05)。结论多期动态CT增强扫描在SPN的诊断中优于常规CT,恶性肿瘤的识别和准确性较高。临床评估SPN时,建议优先采用多期动态CT增强扫描,以提高诊断的准确性,并为后续治疗决策提供可靠依据。 展开更多
关键词 强化多期动态CT增强扫描 孤立性肺结节 诊断 效能分析
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A case of occult insulinoma localized by pancreatic dynamic enhanced spiral CT 被引量:3
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作者 Bao, Zhao-Kang Huang, Xin-Yu +3 位作者 Zhao, Jun-Gong Zheng, Qi Wang, Xiao-Feng Wang, Hong-Cheng 《World Journal of Gastroenterology》 SCIE CAS CSCD 2010年第11期1418-1421,共4页
Insulinomas are the most common category of pancreatic endocrine tumors,with an annual incidence of 1-4 cases per million people.Most are intrapancreatic,benign and solitary.Therefore,they have an excellent prognosis ... Insulinomas are the most common category of pancreatic endocrine tumors,with an annual incidence of 1-4 cases per million people.Most are intrapancreatic,benign and solitary.Therefore,they have an excellent prognosis after surgical resection.However,the localization diagnosis of insulinomas still poses a challenge to surgeons and radiologists.In this case,the tumor was occult and could not be found by either abdominal enhanced spiral computed tomography(CT)or ultrasonography.Therefore,we tried a new method of CT scanning and localized the tumor. 展开更多
关键词 INSULINOMA Computed tomography Localization diagnosis Dynamic enhanced scan enhancement value
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Low overhead design-for-testability for scan-based delay fault testing 被引量:3
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作者 Yang Decai Chen Guangju Xie Yongle 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2007年第1期40-44,共5页
An efficient design-for-testability (DFT) technique is proposed to achieve low overhead for scan-based delay fault testing. Existing techniques for delay test such as skewed-load or broadside make the test generatio... An efficient design-for-testability (DFT) technique is proposed to achieve low overhead for scan-based delay fault testing. Existing techniques for delay test such as skewed-load or broadside make the test generation process complex and produce lower coverage for scan-based designs as compared with non-scan designs, whereas techniques such as enhanced-scan test can make the test easy but need an extra holding latch to add substantial hardware overhead. A new tri-state holding logic is presented to replace the common holding latch in enhanced-scan test to get a substantial low hardware overhead. This scheme can achieve low delay overhead by avoiding the holding latch on the critical timing scan path. What's more, this method can also keep the state and signal activity in the combinational circuit from the scan during data scan-in operation to reduce the power dissipation. Experiment results on a set of ISCAS89 benchmarks show the efficiency of the proposed scheme. 展开更多
关键词 Delay fault testing Design for testability enhanced scan
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Sixty-four MDCT achieves higher contrast in pancreas with optimization of scan time delay 被引量:1
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作者 Tina Stuber Hans-Jürgen Brambs +1 位作者 Wolfgang Freund Markus S Juchems 《World Journal of Radiology》 CAS 2012年第7期324-327,共4页
AIM: To compare different multidetector computed tomography (MDCT) protocols to optimize pancreatic contrast enhancement. METHODS: Forty consecutive patients underwent contrast-enhanced biphasic MDCT (arterial and por... AIM: To compare different multidetector computed tomography (MDCT) protocols to optimize pancreatic contrast enhancement. METHODS: Forty consecutive patients underwent contrast-enhanced biphasic MDCT (arterial and portalvenous phase) using a 64-slice MDCT. In 20 patients, the scan protocol was adapted from a previously used 40-channel MDCT scanner with arterial phase scanning initiated 11.1 s after a threshold of 150 HU was reached in the descending aorta, using automatic bolus tracking (Protocol 1). The 11.1-s delay was changed to 15 s in the other 20 patients to reflect the shorter scanning times on the 64-channel MDCT compared to the previous 40-channel system (Protocol 2). HU values were measured in the head and tail of the pancreas in the arterial and portal-venous phase. RESULTS: Using an 11.1-s delay, 74.2 HU (head) were measured on average in the arterial phase and 111.2 HU (head) were measured using a 15-s delay (P <0.0001). For the pancreatic tail, the average attenuation level was 76.73 HU (11.1 s) and 99.89 HU (15 s) respectively (P = 0.0002). HU values were also significantly higher in the portal-venous phase [pancreatic head: 70.5 HU (11.1 s) vs 84.0 HU (15 s) (P = 0.0014); pancreatic tail: 67.45 HU (11.1 s) and 77.18 HU (15 s) using Protocol 2 (P = 0.0071)]. CONCLUSION: Sixty-four MDCT may yield a higher contrast in pancreatic study with (appropriate) optimization of scan delay time. 展开更多
关键词 COMPUTED tomography PANCREAS scan delay Protocol CONTRAST enhancement
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Orientation-enhanced nonlinear optical properties and phase-conjugate reflective system of a novel Azobenzene doped polymer film 被引量:1
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作者 谢茹胜 范文彬 +1 位作者 陆明 赵有源 《Chinese Physics B》 SCIE EI CAS CSCD 2007年第9期2725-2730,共6页
This paper reports that the nonlinear refractive index of a novel organic optical storage film doped azodiphenylamine polymer is measured by using the Z-scan technique. The nonlinear refractive index up to 3.7× 1... This paper reports that the nonlinear refractive index of a novel organic optical storage film doped azodiphenylamine polymer is measured by using the Z-scan technique. The nonlinear refractive index up to 3.7× 10^-6 cm^2/W induced by thermo-optical effect is obtained. It indicates that the sample has excellent optical non- linear properties. The physical mechanism of the great nonlinear optical effect is analysed and the optical conjugate characteristic is also discussed with degenerate four-wave-mixing. The phase conjugate wave diffracted from the formative refractive index grating in the sample is acquired and its equivalent reflectivity reaches about 22%. On this basis, the reflective wave phase-conjugated mirror system was designed, and the image aberration experienced in propagation in the storage experiment is corrected by using the system. 展开更多
关键词 phase conjugated mirror azo-diphenylamine nonlinear refractive index orientation-enhanced Z-scan
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The Distribution and Morphology Alterations of Microfilaments and Microtubules in Mesophyll Cells and Root-Tip Cells of Wheat Seedlings under Enhanced Ultraviolet-B Radiation
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作者 Limei Gao Yongfeng Li +2 位作者 Aihua Guo Jingru Zhai Rong Han 《American Journal of Plant Sciences》 2014年第22期3423-3431,共9页
The distribution and morphology alterations of microfilaments and microtubules in the mesophyll cells and root-tip cells of wheat seedlings, which had been radiated by enhanced ultraviolet-B (10.08 KJ·m-2·d-... The distribution and morphology alterations of microfilaments and microtubules in the mesophyll cells and root-tip cells of wheat seedlings, which had been radiated by enhanced ultraviolet-B (10.08 KJ·m-2·d-1), were examined through the confocal laser scanning microscope (Model FV1000, Olympus, Japan). Microtubule was labeled with an indirect immunofluorescence staining method, and microfilament was labeled with fluorescein isothiocyanate-phalloidin (FITC-Ph) as probes. The results indicated that microtubules in mesophyll cells, compared with the controls, would be depolymerized significantly, and dispersed randomly showing some spots or short rods in the cytoplasm, under the enhanced UV-B radiation condition. The microtubule bundles tended to be diffused, and the fluorescence intensity of that significantly decreased. The distribution pattern of microfilaments, which usually arranged parallelly in control cells, was broken up by enhanced UV-B radiation. We further investigated the distribution and morphology of microtubules in root-tip cells during every stage of cell division, and found that these aberrant phenomena of microtubules were often associated with abnormal cell division. Our findings suggested that the distribution, morphology and structure of cytoskeleton in mesophyll cells and root-tip cells of wheat seedlings would be affected by enhanced UV-B radiation, which might be related to abnormal cell division caused by enhanced UV-B radiation as an extracellular signal. 展开更多
关键词 Wheat MICROFILAMENT MICROTUBULE enhancED UV-B Radiation Confocal Laser scanning Microscope
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Utility of positron emission tomography-computed tomography scan in detecting residual hepatocellular carcinoma post treatment:Series of case reports 被引量:2
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作者 Jason T Cheng Nelly E Tan Michael L Volk 《World Journal of Gastrointestinal Oncology》 SCIE CAS 2020年第3期358-364,共7页
BACKGROUND Multi-phase computed tomography(CT)or magnetic resonance imaging(MRI)has been the standard of care for hepatocellular carcinoma(HCC)diagnosis for years.CASE SUMMARY We report a case series of four patients ... BACKGROUND Multi-phase computed tomography(CT)or magnetic resonance imaging(MRI)has been the standard of care for hepatocellular carcinoma(HCC)diagnosis for years.CASE SUMMARY We report a case series of four patients in whom positron emission tomographycomputed tomography(PET-CT)scan complemented the conventional CT/MRI scans in evaluating treatment response.In these four cases the conventional multi-phase CT and MRI failed to identify residual HCC disease post-treatment,while PET-CT complemented and aided in treatment response evaluation.In each case,the addition of PET-CT identified and located residual HCC disease,allowed retreatment,and altered medical management.CONCLUSION This case series suggests that PET-CT should perhaps play a role in the HCC management algorithm,in addition to the conventional contrast-enhanced multiphase scans. 展开更多
关键词 Hepatocellular carcinoma Positron emission tomography Contrast-enhanced multiphase scan CIRRHOSIS Residual cancer Treatment response evaluation Case series
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Different Doses of the Enhanced UV-B Radiation Effects on Wheat Somatic Cell Division
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作者 Feifeng Liu Huize Chen Rong Han 《CellBio》 2015年第2期30-36,共7页
Being sessile, plants are continuously exposed to DNA-damaging agents presenting in the environment such as ultraviolet (UV). Sunlight acts as an energy source for photosynthetic plants;hence, avoidance of UV radiatio... Being sessile, plants are continuously exposed to DNA-damaging agents presenting in the environment such as ultraviolet (UV). Sunlight acts as an energy source for photosynthetic plants;hence, avoidance of UV radiations (namely, UV-A, 315 - 400 nm;UV-B, 280 - 315 nm;and UV-C, 1 group: 4.05 kJ&#8226m-2&#8226d-1, B2 group: 10.08 kJ&#8226m-2&#8226d-1, B3 group: 7.05 kJ&#8226m-2&#8226d-1, B4 group: 23.02 kJ&#8226m-2&#8226d-1) treatment wheat, then, explored on the growth of wheat root and wheat root tip cell of chromosome aberration effect. In wheat, root-tip cells were observed with confocal laser scanning microscopy (CLSM), the results showed that low doses of B1 group (4.05 kJ&#8226m-2&#8226d-1) promoted the growth of wheat root and cell mitosis frequency. But high dose of B2 group (10.08 kJ&#8226m-2&#8226d-1), B3 group (17.05 kJ&#8226m-2&#8226d-1), B4 group (23.02 kJ&#8226m-2&#8226d-1) inhibited the growth of wheat root tip, and made crooked growth of wheat root, and inhibited the wheat root tip cell mitotic frequency and processed that induce root tip cells of wheat produce all kinds of aberration of chromosome in the interphase containing “multiple nucleoli nuclei”, “incomplete nuclei”, “long round nuclei”, “bean sprouts nucleus”. In mitosis M period contains “dissociative chromosome”, “chromosome bridge”, “adhesion chromosome”, “multi-bundle divide”, “nuclear anomalies”. After, high doses of enhanced UV-B radiation treatment, most of the cell cycle anomaly concentrated in mitosis interphase. In mitosis M period, with UV-B radiation dose enhanced chromosome aberration rate was on the rise and the aberration types also increasing. 展开更多
关键词 WHEAT enhanced UV-B Radiation CHROMOSOME ABERRATION CONFOCAL Laser scanning Microscopy (CLSM)
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