Imaging Effect and Accuracy Analysis of 64-Slice Spiral CT in the Diagnosis of Coronary Artery Stenosis

Objective:To analyze the imaging effect and accuracy of 64-slice spiral CT in the diagnosis of coronary artery stenosis.Methods:30 patients with suspected coronary heart disease admitted to our hospital from March 2022 to March 2023 were selected.All patients underwent both 64-slice spiral CT and digital subtraction angiography(DSA).DSA is considered the gold standard for diagnosis,so it was used to analyze the diagnostic performance of 64-slice spiral CT.Results:(1)The diagnostic results of digital subtraction angiography and 64-slice spiral CT was analyzed and compared with each other.The 64-slice spiral CT had an accuracy of 96.67%(29/30),a sensitivity 96.55%(28/29),and a specificity of 100.00%(1/1)in diagnosing coronary artery stenosis.(2)There was no significant difference between 64-slice spiral CT and digital subtraction angiography in the positive detection rate of anterior descending artery lesion,the positive detection rate of left main lesion,the positive detection rate of left circumflex artery lesion and the positive detection rate of right coronary artery lesion(P>0.05).(3)There was no significant difference between 64-slice spiral CT examination and DSA examination in identifying mild stenosis,moderate stenosis,and severe stenosis of coronary arteries(P>0.05).Conclusion:64-slice spiral CT examination can accurately determine the degree of occlusion of coronary arteries,which allows for the accurate diagnosis of coronary artery stenosis.

Relation between Epicardial Adipose Tissue Thickness Assessed by Multidetector Computed Tomography and Significance of Coronary Artery Disease

Objective: To evaluate the relation between epicardial adipose tissue (EAT) thickness and also pericoronary fat assessed by Multidetector Computed Tomography (MDCT) with both calcium score and significance of coronary artery disease. Background: Epicardial adipose tissue (the visceral fat of the heart present under the visceral layer of the pericardium) has the same origin of abdominal visceral fat, which is known to be strongly related to the development of coronary artery atherosclerosis. Multidetector CT (MDCT) provides an accurate and reproducible quantification of EAT due to its high spatial and temporal resolution. Patients and Methods: The current study included 70 patients with low-intermediate probability of coronary artery disease. All patients were subjected to 256 Multidetectors CT to assess EAT thickness, the mean thickness of the pericoronary fat surrounding the three coronary arteries and coronary calcium score. Also coronary CT angiography was done and patients were then divided into 3 groups according to significance of coronary atherosclerosis: Group 1: No atherosclerosis (20 patients), Group 2: Non obstructive atherosclerosis (luminal narrowing less than 50% in diameter) (25 patients), Group3: Obstructive atherosclerosis (luminal narrowing ≥ 50%) (25 patients). Results: The mean EAT thickness and the mean pericoronary fat thickness were significantly higher in patients with obstructive coronary artery disease (CAD) with stenosis > 50% (group 3) compared to other groups with normal coronaries or non obstructive (CAD). ROC curve was used to define the best cut off value of the thickness of both EAT and pericoronary fat in predicting the obstructive CAD group which was ≥7.2 and 12.6 mm for epicardial and pericoronary fat respectively. Also there is a positive correlation between both epicardial adipose tissue and pericoronary fat thickness and the coronary calcium score. Conclusion: EAT thickness and pericoronary fat thickness can be used in predicting the significance of coronary artery disease.

Application of Dual-Source CT TurboFlash Coarse Pitch Scanning in Coronary Artery Imaging

Objective: To compare and analyze the image quality and radiation dose of three scanning modes of dual-source CT coronary artery retrospectively, and to discuss the application value of TurboFlash coarse pitch scanning mode. Methods: The imaging data of 100 patients who underwent CT coronary angiography (CCTA) using Siemens force CT retrospective gated triggering spiral scan (RES-SPIRAL), adaptive prospective gated triggering sequence scan (SEQ) and prospective coarse pitch scan (TurboFlash) retrospectively was collected. The image quality was evaluated by objective and subjective methods. The effective radiation dose of patients was compared and analyzed, and the indications of the three scanning modes were analyzed. The application value of dual-source CT TurboFlash coarse pitch scanning in coronary artery imaging was evaluated. Results: The results showed that the left main coronary artery, the right coronary artery and their tertiary branches could be clearly displayed in the three groups of images: the left anterior descending branch, the left circumflex branch, and their three-level branches. There was no statistical difference in subjective image quality among the three groups of pictures (P > 0.05). There was no statistical difference in objective evaluation indexes, such as CT value, SNR, CNR and Noise among the three groups (P > 0.05). The patient radiation dose results showed that the effective radiation dose ED of RES-SPIRA scan was (9.22 ± 1.33) mSv. The dose of SEQ was (2.88 ± 2.47) mSv, and the dose of TurboFlash was (0.51 ± 0.16) mSv. There was significant difference in comparison of the three groups (P 0.05). RES-spiral scanning had the highest radiation dose and TurboFlash coarse pitch scanning (TurboFlash) had the lowest radiation dose. Conclusion: TurboFlash coarse pitch scanning is low in dosage, fast in speed and wide in adaptability. It is especially suitable for the elderly, children, coma and other patients who cannot cooperate with breath-holding examination, as well as for the screening and examination of coronary artery diseases in asymptomatic population. Undoubtedly, it is a worthy method of heart coronary artery examination.

Using receiver operating characteristic curves to evaluate the diagnostic value of the combination of multislice spiral CT and alpha-fetoprotein levels for small hepatocellular carcinoma in cirrhotic patients

BACKGROUND： The various combination of multiphase enhancement multislice spiral CT （MSCT） makes the diagno- sis of a small hepatocellular carcinoma （sHCC） on the back- ground of liver cirrhosis possible. This study was to explore whether the combination of MSCT enhancement scan and alpha-fetoprotein （AFP） level ficiency for sHCC. could increase the diagnostic ef- METHODS： This study included 35 sHCC patients and 52 cir- rhotic patients without image evidence of HCC as a control group. The diagnoses were made by three radiologists em- ploying a 5-point rating scale, with postoperative pathologic results as the gold standard. Receiver operating characteristic （ROC） curve analysis was performed to evaluate the diag- nostic value of the three MSCT combination modes （arterial phase＋portal-venous phase, arterial phase＋delayed phase, arterial phase＋portal-venous phase＋delayed phase） and AFP levels for sHCC on the background of liver cirrhosis. RESULTS： The area under ROC curve （AUC）, sensitivity, and specificity of the combination of arterial phase＋portal- venous phase＋delayed phase were 0.93, 93%, and 82%, respectively. The average AUC of the arterial phase＋portal- venous phase＋delayed phase combination was significantly greater than that of the arterial phase＋portal-venous phase （AUC=0.84, P=0.01） and arterial phase＋delayed phase （AUC=0.85, P=0.03）. Arterial phase＋portal-venous phase had a smaller AUC （0.84） than arterial phase＋delayed phase （0.85）, but the difference was insignificant （P=0.15）. After combining MSCT enhancement scan with AFP, the AUC, sensitivity, and specificity were 0.95, 94%, and 83%, respectively, indicating a greatly increased diagnostic efficiency for sHCC. CONCLUSIONS： The combination of AFP and 3 phases MSCT enhancement scan could increase the diagnostic efficiency for sHCC on the background of liver cirrhosis. The application of ROC curve analysis has provided a new method and reference in HCC diagnosis.

Coronary Artery Fistula and Its Imaging Modalities—A Review Article

Coronary artery fistula (CAF) is known be a rare defect of coronary artery. When there is an abnormal pre-capillary communication between single or multiple branches of the coronary artery and any of the cardiac chambers or great vessels, it is designated as CAF. It can be found in both congenital and acquired form. Congenital origin of fistula occupies higher percentage compared to the acquired one. A wide variety of imaging modalities have been lunched to provide the best possible way to access and treat the defect. With regard to the assessment of the coronary artery fistula, trans-thoracic Doppler echocardiography and multi-slice CT (MSCT) angiography have commendable role, however, MSCTA comes in the leading position.

基于人工智能的“三低”冠状动脉CTA影像质量和辐射剂量研究

目的探讨基于人工智能(AI)影像后处理的“三低”(低剂量对比剂、对比剂低流率及低辐射剂量)冠状动脉CTA(CCTA)技术的影像质量和辐射剂量。方法前瞻性纳入疑似冠心病病人60例,平均年龄(56.3±3.9)岁。将病人随机分为行“三低”CCTA检查的研究组(30例)和行常规CCTA检查的对照组(30例)。根据Likert分级评分法对冠状动脉主支血管[包括左主干(LM)、左前降支(LAD)、左回旋支(LCX)及右冠状动脉(RCA)]进行影像质量主观评分。测量升主动脉(AA)、LM、LAD中段(mLAD)、LCX近端(pLCX)、RCA中段(mRCA)、右冠状动脉远段(dRCA)管腔及邻近脂肪CT值和噪声(SD)值,以及右心室(RV)及右侧心膈角区脂肪的CT值和SD值,并计算信噪比(SNR)和对比噪声比(CNR)。采用卡方检验或独立样本t检验比较2组病人一般资料、影像质量主观评分和评价指标,以及辐射剂量的差异。结果2组间LM、LAD、LCX、RCA影像质量主观评分的差异均无统计学意义(均P>0.05)。相比对照组,研究组AA、LM、mLAD、pLCX、mRCA、dRCA管腔CT值分别提高了32.5%、8.6%、11.7%、11.2%、9.2%和2.1%;2组RV的CT值、SNR、CNR的差异均无统计学意义(均P>0.05)。研究组的容积CT剂量指数(CTDIvol)、剂量长度乘积(DLP)、有效辐射剂量(ED)均低于对照组(均P<0.05)。结论基于AI影像后处理的“三低”CCTA可保证冠状动脉影像质量,且降低了辐射剂量,用于冠心病筛查具有很好的临床可行性。

采用MSCT灌注成像检查评估周围型非小细胞肺癌分化程度的可行性分析

目的分析多层螺旋CT(MSCT)灌注成像检查评估周围型非小细胞肺癌(NSCLC)分化程度的可行性。方法选取本院2017年7月至2018年10月本院收治确诊的52例周围型NSCLC患者作为研究对象,比较不同分化级别患者的MSCT灌注成像参数;分析灌注参数与分化程度的相关性。结果高分化、中分化周围型NSCLC患者BF、BV、PS、MTT及PH数值均高于低分化周围型NSCLC,以高分化周围型NSCLC的BF、BV、PS、MTT及PH数值最高。各个灌注参数值,其中高分化、中分化周围型NSCLC的BF、PH与低分化周围型NSCLC比较差异显著(P<0.05),三者BV、PS及MTT数值比较,均为明显差异(P>0.05)。周围型NSCLC患者灌注参数BF、PH与其分化程度成负相关,且相关性显著(P<0.05)。结论MSCT灌注成像检查可有效反映周围型NSCLC的分化程度,其灌注参数中BF、PH对评估其分化程度有一定帮助,与周围型NSCLC分化程度具有一定相关性。

多层螺旋CT血管造影(MSCTA)诊断颅内动脉瘤的影像学特征及诊断效能研究

分析多层螺旋CT血管造影(multislice CT angiography,MSCTA)诊断颅内动脉瘤的影像学特征及诊断效能。选取河北省衡水市第五人民医院2019年1月—2022年12月收治的80例颅内动脉瘤患者为研究对象,根据随机数表法将所有患者分为对照组与观察组,每组各40例。对照组接受数字减影血管造影技术(digital subtraction angiography,DSA)诊断,观察组接受MSCTA诊断。对比两组患者不同部位的脑动脉瘤检出率、两种检测方法下的图像质量分级情况及诊断效能。研究发现,针对颅内动脉瘤的临床诊断,可为患者实施MSCTA检查,此检查与DSA检查相比同样具有理想的诊断价值,动脉瘤检出率与图像质量较高,但与DSA此类有创检查项目相比,MSCTA对患者的影响更小,具有便捷、实惠等优势,可应用于临床诊断中。

MSCTA在颈动脉血管支架植入术前后颈动脉狭窄程度评估中的应用

目的评价多层螺旋CT血管造影(MSCTA)在颈动脉血管支架植入术(CAS)前后颈动脉狭窄程度评估中的应用价值。方法回顾性分析2020年2月至2023年11月在我院行CAS治疗的82例患者临床资料,所有患者均在术前、术后进行MSCTA检查评估颈动脉狭窄程度,比较患者术前、术后颈动脉狭窄程度变化,以数字减影血管造影(DSA)为金标准评估MSCTA在不同颈动脉狭窄程度患者颈动脉狭窄程度评估中的诊断价值。结果82例颈动脉狭窄患者,其中左、右侧颈内动脉狭窄29例、41例,双侧颈内动脉狭窄12例,CAS治疗血管共94支,手术均成功;MSCTA结果显示,CAS术前94支血管以中、重度为主,占比82.98%,部分血管闭塞,占比13.83%,CAS术后以轻度狭窄为主,占比92.55%,部分患者为中度狭窄,占比7.45%,无重度狭窄和闭塞患者,82例患者CAS治疗前后颈动脉狭窄程度分布差异有统计学意义(P<0.05);CAS术前,MSCTA评估轻、中、重度颈动脉狭窄和颈动脉闭塞的灵敏度分别为0.00%、77.08%、90.62%、85.71%,特异度分别为96.80%、90.38%、88.701%、98.75%,准确率分别为96.80%、84.00%、89.36%、96.80%,与DAS结果比较,kappa值分别为0、0.678、0.770、0.870;CAS术后,MSCTA评估轻、中度颈动脉狭窄和颈动脉闭塞的灵敏度分别为92.55%、0.00%,特异度分别为0.00%、92.55%,准确率均为92.55%,与DAS结果比较,kappa值均为0,MSCTA评估重度颈动脉狭窄和颈动脉闭塞结果均与DAS结果一致。结论MSCTA在CAS术前后颈动脉狭窄程度的评估中具有较好的应用价值。

MSCT和MRI在膝关节半月板、关节软骨损伤诊断及分期评估中的应用

目的:探讨多层螺旋CT(MSCT)与磁共振成像(MRI)在膝关节半月板及关节软骨损伤(MACI)诊断及分期评估中的价值。方法:对97例均接受MSCT、MRI检查的MACI患者的临床资料进行回顾性分析,金标准为关节镜诊断结果,分析MSCT、MRI的诊断效能。结果:关节镜诊断结果显示,97例患者的194个半月板中,损伤103个,未损伤91个;97例患者存在582个关节软骨面,其中损伤284个,未损伤298个;MSCT诊断结果显示,97例患者存在194个半月板,损伤106个,未损伤88个;MRI诊断结果显示,97例患者存在194个半月板,损伤109个,未损伤85个。MRI诊断膝关节半月板损伤和软骨关节损伤的准确度、特异度及敏感度均高于MSCT(P<0.05);MRI对半月板损伤分级和软骨关节损伤分期的诊断准确率高于MSCT。结论:MRI在MACI诊断中的价值优于MSCT,能准确反映损伤严重程度。

IQon光谱CT冠状动脉CTA多参数成像对冠心病的诊断价值

目的探讨IQon光谱计算机断层扫描(CT)冠状动脉CT血管造影(CTA)多参数成像对冠心病的诊断价值,包括斑块性质、心肌缺血、心肌纤维化等方面。方法于2021年1—12月采用IQon光谱CT多参数成像对福建中医药大学附属第二人民医院的100例患者进行检查,其中50例健康体验者为正常组,50例为疑似冠心病组。对所有受试者行光谱冠状动脉平扫检查,并进行钙化评分。对疑似冠心病组受试者注入对比剂,行冠状动脉CTA检查,并通过后处理软件获得虚拟平扫图像、有效原子序数图、碘密度图、多期相心肌碘密度图和延迟扫描心肌图像。对各种图像进行分析,评价其对冠心病诊断的价值,并计算最佳碘密度阈值。结果普通平扫和虚拟平扫所得钙化评分具有良好的一致性(Kappa=0.871)。有效原子序数图能够区分钙化和非钙化斑块,碘密度图能够反映斑块内碘分布。多期相心肌碘密度图能够显示心肌灌注情况,受试者工作特征曲线分析显示,碘密度阈值为30 HU时,对心肌缺血的诊断敏感度为90%,特异度为94%。结论IQon光谱CT冠状动脉CTA多参数成像对冠心病具有较高的诊断价值,能够提供综合的解剖和功能信息,为临床诊断和治疗提供依据。

全身磁共振弥散加权成像联合多层螺旋CT对多发性骨髓瘤的诊断价值

目的 探究全身磁共振弥散加权成像(WB-DWI)联合多层螺旋CT对多发性骨髓瘤的诊断价值。方法 选取2019年6月~2023年1月于我院收治的80例多发性骨髓瘤患者为研究对象,并按照检测方式将其分为WB-DWI组(n=25)、多层螺旋CT组(n=25)、联合组(n=30)。分析WB-DWI、多层螺旋CT单一及联合对患者累及部位的检出率,分析两种检查方式单一及联合对多发性骨髓瘤的检出情况,通过ROC曲线分析WB-DWI、多层螺旋CT联合诊断多发性骨髓瘤的临床价值。结果 检测结果主要与Durie-Salmon分期、国际骨髓瘤分期相关(P<0.05)。与WB-DWI、多层螺旋CT单一检测对比,联合检测患者累及部位的检出率较高(P<0.05)。在多发性骨髓瘤诊断中WB-DWI、多层螺旋CT联合检测高于单一检测(P<0.05)。与WB-DWI、多层螺旋CT单项诊断对比,两项联合诊断多发性骨髓瘤的敏感度、特异性、准确性均较高(P<0.05)。结论 相较于WB-DWI、多层螺旋CT单项检测,联合检测可有效提升患者病理检出情况,提高对多发性骨髓瘤的诊断价值。

多层螺旋CT与数字化X线摄影对多发肋骨骨折患者的诊断效果分析

目的:探讨多层螺旋CT三维成像(MSCT)与数字化X线摄影(DR)检查对多发肋骨骨折患者的诊断价值。方法:选择2022年1月-2023年11月苏州市中医医院100例疑似多发肋骨骨折患者为研究对象,均实施MSCT、DR检查,以临床诊断结果为对照,分析MSCT、DR的诊断效能。结果:100例疑似患者通过临床综合诊断,其中88例证实为多发肋骨骨折,以此结果作为对照,DR检查真阳、真阴、假阳、假阴例数分别为78、7、5、10例;MSCT检查分别为86、11、1、2例。MSCT的诊断敏感度、准确度分别为97.73%、97.00%,均高于DR的88.64%、85.00%,差异均有统计学意义(P<0.05);两种检查方式的特异度分别为58.33%、91.67%,差异无统计学意义(P>0.05)。结论:多发性肋骨骨折诊断中应用MSCT技术,诊断准确率较高,可得到清晰的影像学图像,且无创安全,方便快捷,为疾病诊治提供可靠依据。

64排螺旋CT冠状动脉成像诊断老年冠状动脉狭窄的应用价值

目的:探讨64排螺旋CT冠状动脉(以下简称冠脉)成像诊断老年冠状动脉狭窄的应用价值。方法:选择2020年1月—2023年6月收治的老年冠心病患者50例,均接受64排128层螺旋CT(64-SCTA)及冠状动脉造影(CAG)检查,以CAG检查结果作为冠脉狭窄诊断的“金标准”,计算64-SCTA检查的诊断价值指标,包括灵敏度、特异度和准确度。结果:64-SCTA诊断冠状动脉狭窄的灵敏度、特异度及准确度分别为64.82%,94.35%和70.80%;进一步去除钙化节段,64-SCTA诊断冠状动脉狭窄的灵敏度、特异度及准确度分别为84.09%,97.33%和84.09%,其中诊断灵敏度和准确度较前显著提高,差异有统计学意义(P<0.05),特异度较前提高,但是差异无统计学意义(P>0.05)。结论:64排螺旋CT冠状动脉成像检查诊断老年冠状动脉狭窄的灵敏度和准确度较高。

颈动脉超声评估颈动脉硬化程度与MSCTA评估冠脉狭窄程度的相关性及联合预测价值

目的研究分析颈动脉超声评估颈动脉硬化程度与MSCTA评估冠脉狭窄程度的相关性与联合预测价值。方法选取我院心内科在2017年1月-2019年12月收治的确诊及疑似冠心病的300例患者,所有患者均进行多层螺旋CT血管造影(MSCTA)、颈动脉彩超和冠状动脉造影(CAG)检查,以CAG检查为金标准,计算上述两种诊断方法对冠心病检出率、阳性率、敏感性、特异性、预测准确性等诊断学指标,并研究分析超声评估与MSCTA评估之间的相关性。结果超声与CAG检查结果一致性为Kappa=0.588,MSCTA与CAG检查结果一致性为Kappa=0.503(P<0.05);超声评估颈动脉硬化程度准确度、敏感度、特异度、阳性预测值及阴性预测值分别为80.33%、80.95%、79.28%、86.93%、70.97%;MSCTA评估冠脉狭窄程度的准确度为81.07%,其中轻度狭窄的准确度、敏感度、特异度、阳性预测值及阴性预测值分别为83.54%、83.72%、83.33%、85.04%、81.90%;中度狭窄的分别为84.36%、65.28%、92.40%、78.33%、86.34%;重度狭窄的分别为86.83%、78.57%、88.56%、58.93%、95.19%;颈动脉超声评估颈动脉硬化程度与MSCTA评估冠脉狭窄程度呈正相关性(r=0.852,P<0.05)。结论颈动脉超声评估与MSCTA评估在诊断冠心病冠脉硬化程度与狭窄程度时与CAG金标准有较好的一致性,有助于提高冠心病的诊断价值,且其具有无创、简单便捷、重复性高等优点,值得临床推广使用。

Use of various CT imaging methods for diagnosis of acute ischemic cerebrovascular disease

Thirty-four patients with cerebral infarction and 18 patients with transient ischemic attack were examined by multi-slice spiral CT scan, CT perfusion imaging, and CT angiography within 6 hours after onset. By CT perfusion imaging, 29 cases in the cerebral infarction group and 10 cases in the transient ischemic attack group presented with abnormal blood flow perfusion, which corresponded to the clinical symptoms. By CT angiography, various degrees of vascular stenosis could be detected in 41 patients, including 33 in the cerebral infarction group and eight in the transient ischemic attack group. The incidence of intracranial artery stenosis was higher than that of extracranial artery stenosis. The intracranial artery stenosis was located predominantly in the middle cerebral artery and carotid artery siphon, while the extracranial artery stenosis occurred mainly in the bifurcation of the common carotid artery and the opening of the vertebral artery. There were 34 cases （83%） with convict vascular stenosis and perfusion abnormalities, and five cases （45%） with perfusion abnormalities but without convict vascular stenosis. The incidence of cerebral infarction in patients with National Institutes of Health Stroke Scale scores 〉 5 points during onset was significantly higher than that in patients with National Institutes of Health Stroke Scale scores 〈 5 points. These experimental findings indicate that the combined application of various CT imaging methods allows early diagnosis of acute ischemic cerebrovascular disease, which can comprehensively analyze the pathogenesis and severity of acute ischemic cerebrovascular disease at the morphological and functional levels.

肝总动脉起源变异的MSCTA和超声表现

目的 利用MSCTA和CDFI观察肝总动脉起源变异的发生率及影像表现,为临床腹部疾病的诊治提供参考依据。方法 选取287例患者腹部MSCTA及部分CDFI影像资料,观察肝总动脉起源情况,记录相关数据并分析。结果 符合纳入标准的230例患者中肝总动脉起源变异共计15例,占总体的6.50%。肝总动脉变异分为六种类型:Ⅰ型(肝总动脉起自肠系膜上动脉)9例;Ⅱ型(肝总动脉起自腹主动脉)2例;Ⅲ型(肝总动脉、胃左动脉和脾动脉均起自腹主动脉)1例;Ⅳ型(腹腔干与肠系膜上动脉共干)1例;Ⅴ型(肝总动脉和脾动脉共干起自肠系膜上动脉,)1例;Ⅵ型(肝总动脉缺失)1例。结论 肝总动脉变异影像学表现具有特征性,MSCTA结合超声可多角度反映血管变异情况,对临床诊断有重要指导意义。

CTA技术在心肌桥-壁冠脉血管形态学诊断中的应用价值

目的探讨螺旋CT血管造影(CTA)诊断心肌桥-壁冠状动脉(MB-MCA)血管形态学的价值。方法200例疑似MB-MCA患者均进行CTA和冠状动脉造影(CAG)检查,分析CTA技术对MB-MCA的诊断价值,对比CTA与CAG对浅在型、深在型MB-MCA心肌桥长度、壁冠脉狭窄程度的检查结果。结果CTA诊断MB-MCA的灵敏度为98.14%,特异度为89.74%,准确率为96.50%。CTA显示的浅在型与深在型MB-MCA患者的心肌桥长度均高于CAG(P<0.05),但CTA和CAG的壁冠脉狭窄程度比较,差异均无统计学意义(P>0.05)。结论CTA诊断MB-MCA的灵敏度、特异度及准确率均较高,能够从多个角度对壁冠脉血管、管腔形态以及结构进行观察,明确心肌桥长度、壁冠脉狭窄程度等指标。

不同病理类型孤立性肺癌患者的多层螺旋CT影像学特征分析

目的 分析不同病理类型孤立性肺癌患者的多层螺旋CT(MSCT)影像学特征。方法 选取52例孤立性肺癌患者,根据病理类型的不同分为腺癌组(n=34)、鳞状细胞癌组(n=12)和小细胞癌组(n=6)。所有患者均进行MSCT检查,比较3组患者的CT值、强化情况、强化方式、相对廓清值及廓清率。结果 MSCT增强扫描30、60 s时,腺癌组患者CT值均高于鳞状细胞癌组和小细胞癌组,差异均有统计学意义(P﹤0.05);MSCT增强扫描120 s时,腺癌组和鳞状细胞癌组患者CT值均高于小细胞癌组,差异均有统计学意义(P﹤0.05)。腺癌组、鳞状细胞癌组患者的强化净增值均高于小细胞癌组,差异均有统计学意义(P﹤0.05)。腺癌组患者均匀强化率高于鳞状细胞癌组和小细胞癌组,差异均有统计学意义(P﹤0.05)。MSCT延迟扫描180 s时,小细胞癌组患者相对廓清值、廓清率均高于腺癌组和鳞状细胞癌组,差异均有统计学意义(P﹤0.05);MSCT延迟扫描600 s时,腺癌组患者相对廓清值、廓清率均低于鳞状细胞癌组和小细胞癌组,差异均有统计学意义(P﹤0.05)。结论 不同病理类型孤立性肺癌患者的MSCT影像学特征存在明显差异,临床可综合评估不同扫描时间CT值、强化情况等多种影像学特征,为孤立性肺癌患者病理类型的诊断提供参考依据。

多层螺旋CT与磁共振扩散加权成像在胰腺神经内分泌肿瘤中的应用价值

目的分析多层螺旋CT(multisliecs spiral CT,MSCT)与磁共振扩散加权成像(diffusionweighted imaging,DWI)对胰腺神经内分泌肿瘤(pancreatic neuroendo crineneoplasms,pNEN)的应用价值。方法对我院2021年7月~2022年11月收治的pN EN患者80例临床资料为观察组,患者均进行MSCT与DWI检测,分析两种检查手段对该病的应用价值。结果对不同病理分级患者MSCT各项检查参数对比显示:肿瘤边缘、形状、囊变坏死、主胰管扩张、远处转移肿瘤最大径以及CT绝对强化的动脉、门脉期值存在明显差异(P<0.05)。经单因素方差分析显示:不同病理分级患者DWI检查的ADC值存在统计学差异,其中G1、G2级患者明显高于G3级,G2级又明显高于G3级(P均<0.05)。将两项检查参数指标纳入Logistic回归模型中得出联合预测数值,随后进行ROC曲线分析显示:将G3患者设定为检测变量,剩余分级患者作为参照变量,联合预测AUC达0.927;预测敏感度92.3%、特异度81.2%。结论MSCT与DWI对pNEN患者的预测诊断均具有一定价值,但为避免单一检测手段的局限性,建议临床中结合其他检查手段进行判定。