Analysis of The Value of Multi-Slice Spiral CT and Magnetic Resonance Imaging in The Diagnosis of Carpal Joint Injury

Objective:To analyze the value of multi-slice spiral computed tomography(CT)and magnetic resonance imaging(MRI)in the diagnosis of carpal joint injury.Methods:A total of 130 patients with suspected wrist injuries admitted to the Department of Orthopedics of our hospital from January 2023 to January 2024 were selected and randomly divided into a single group(n=65)and a joint group(n=65).The single group was diagnosed using multi-slice spiral CT,and the joint group was diagnosed using multi-slice spiral CT and magnetic resonance imaging,with pathological diagnosis as the gold standard.The diagnostic results of both groups were compared to the gold standard,and the diagnostic energy efficiency of both groups was compared.Results:The diagnostic results of the single group compared with the gold standard were significant(P<0.05).The diagnostic results of the joint group compared with the gold standard were not significant(P>0.05).The sensitivity and accuracy of diagnosis in the joint group were significantly higher than that in the single group(P<0.05).The specificity of diagnosis in the joint group was higher as compared to that in the single group(P>0.05).Conclusion:The combination of multi-slice spiral CT and MRI was highly accurate in diagnosing wrist injuries,and the misdiagnosis rate and leakage rate were relatively low.Hence,this diagnostic program is recommended to be popularized.

Three-dimensional Imaging of Multi-slice Spiral CT in Bronchial Artery Correlative Study on Blood Supply of Central Lung Cancer and Its Clinical Significance

Objective: To evaluate three-dimensional bronchial artery imaging charactersin central lung cancer and applied values with multi-slice spiral CT (MSCT) to provide theoreticalevidence on blood supply and intervention therapy. Methods: Eighteen patients with central lungcancer underwent MSCT with real time helical thin-slice CT scanning. Three-dimensional bronchialartery reconstruction was done at the console work-station. The space anatomical characters ofbronchial artery were observed through different rotations. Results: For 6 cases, thethree-dimensional images of bronchial artery (33.33%) could exactly show the origins, the routes(lung inner segment and mediatism segment) and the diameters of bronchial arteries. Vision rate ofbronchial arteries was the highest in pulmonary artery stricture and truncation groups, and thevessels' diameter became larger apparently. These characters demonstrated blood supply of this kindof central lung cancer come from bronchial artery. Volume rendering images were the best ones amongthree-dimensional images. Conclusion: Three-dimensional imaging with MSCT in bronchial artery canreveal the anatomical characters of bronchial artery and provide theoretical evidence on bloodsupply and intervention therapy of central lung cancer.

Comparison of the Imaging Manifestations and Diagnostic Values of Multi-slice Spiral CT and Enhanced MRI Scans of Primary Liver Cancer(PLC)Intrahepatic Lesions

Objective:To compare and analyze the clinical diagnostic value of multi-slice spiral CT and enhanced MRI for primary liver cancer(PLC),and to summarize the imaging findings.Methods:The research subjects in this article were 50 patients with PLC who were admitted to our hospital from 2017 April to 2018 September.After the patients were admitted,they were examined by multi-slice spiral CT and enhanced MRI scanning,and the pathological diagnosis results were followed up.Relevant information was reviewed and analyzed.Results:The detection rate of multi-slice spiral CT was higher than that of MRI in the portal venous phase lesion detection.The difference was statistically significant(P<0.05).The detection rate of lesions in the arterial phase and delayed phase was not statistically significant(P>0.05);the diagnostic accuracy of multi-slice spiral CT was 85.96%,and the diagnostic accuracy of enhanced MRI scanning was 91.11%,which was not statistically significant(P>0.05).MRI scans showed the capsules of primary liver cancer better than CT,but the difference was not statistically significant(P>0.05).Conclusion:In conclusion,both multi-slice spiral CT and enhanced MRI can be used for the effective diagnosis of primary liver cancer intrahepatic lesions.The diagnostic value of the two is equivalent,but enhanced MRI has a slightly higher diagnostic accuracy and can be used as the preferred method.

Multi-slice Spiral CT Three-dimensional Portography in Portal Vein Tumor Thrombus of Hepatic Cancer

Objective: To study the clinical significance of multi-slice spiral CT 3-dimensional (3D) portography in portal vein tumor thrombosis of hepatocellular cacinoma.Methods: 57 cases undergoing 3D portography were collected, of which 6 cases were normal, 5 cases were subjected to cirrhosis and hypertension of portal vein, 42 cases had portal tumor thrombus of hepatic cancer, and the remaining 4 cases showed lymph node enlargment in hilar of liver. All data of the patients came from conventional multi-slice spiral CT double phase of liver. Contrast media was 1.5–2 ml/kg with the injection rate being 2.5–3 ml/s. Axis and 3D portography was analyzed and compared in 42 cases of portal tumor thrombus of hepatic cancer.Results: According to portal tumor thrombus position, 42 cases were fallen into three categories: left (13 cases), right (20 cases), main (9 cases) of potal vein. There was no difference between axis and 3D portography in displaying portal tumor thrombus of hepatic cancer (P>0.05), but 3D portography showing collateral branches was better than axis portography after main portal vein thrombus.Conclusion: Multi-slice spiral CT 3D portography can display the position and types of portal tumor thrombus of hepatic cancer. 3D combined with axis portography can better evaluate the portal tumor thrombus of hepatic cancer and guide to select the therapies. Key words portal vein - tumor thrombus - multi-slice CT - 3 dimension imaging

Multi-slice spiral CT angiography in evaluating donors of living-related liver transplantation

BACKGROUND: During the past years, the number of liver transplantation has increased greatly, but the number of available organs has not increased. In view of the critical shortage of organs, the indications for living-related liver transplantation (LRLT) have broadened since experience with the procedure has been achieved. This study was undertaken to assess the value of multi-slice spiral CT (MSCT) angiography in evaluating the hepatic arterial and veinous anatomy of potential donors for LRLT. METHODS: MSCT was performed after intravenous injection of contrast material at 3 ml/s. The total dose was calculated as 2 ml/kg. Twenty LRLT donors (2 men and 18 women) were subjected to MSCT angiography of hepatic blood vessels. These were generated by volume rendering and maximum intensity projection, while curved planar reformation was added in 5 patients. RESULTS: We identified 10 important hepatic vascular variants in 9 of the 20 donors (4 arterial, 4 venous, and 2 portal venous variants). In hepatic arterial variants, two had a replaced right hepatic artery arising from the superior mesenteric artery, an accessory right hepatic artery from the superior mesenteric artery and a replaced left hepatic artery arising from the left gastric artery. In hepatic venous variants, three had an accessory inferior right hepatic vein and one had two accessory inferior right hepatic veins. In hepatic portal venous variants, two had trifurcation of the main portal vein. CONCLUSIONS: As a non-invasive and reliable method, MSCT angiography is of value in the clinical evaluation of LRLT donors. MSCT angiography should be recommended as a routine preoperative examination for potential LRLT donors.

Study on the combined value of multi-slice spiral CT in the diagnosis of elderly colorectal cancer colorectal cancer tumor markers

Objective:To investigate the value of tumor markers in colorectal cancer with multi-slice spiral CT in the diagnosis of elderly colorectal cancer.Methods:From January 2016 to September 2017 year period, 73 elderly patients with colorectal cancer treated in our hospital were selected as observation group;64 elderly patients with intestinal benign lesions were selected as control group during the same period. Serum samples were collected to detect contents of CEA, CA72-4, CA19-9 and CYFRA21-1 by Roche luminous immunoassay analyzer, and multi slice spiral CT was used.Results:Serum levels of CEA, CA72-4, CA19-9 and CYFRA21-1 levels of the observation group were significantly higher than that of the control group;the positive rate of CEA, CA72-4, CA19-9, CYFRA21-1 and their combined detection were all significantly higher than that of the control group;positive rate of MSCT in the observation group was higher than the control group;positive rates of tumor markers combining with MSCT examination of colorectal cancer were higher than that of combined detection of tumor markers and MSCT examination;but there was no significant difference in positive rate of combined detection of tumor markers and the positive rate of MSCT detection of colorectal cancer.Conclusion:Colorectal cancer tumor markers combined with multi-slice spiral CT in the diagnosis of colorectal cancer in elderly has important research value, can significantly improve the positive rate of diagnosis.

Contour reconstruction of three-dimensional spiral CT damage image

In order to improve the diagnosis and analysis ability of 3D spiral CT and to reconstruct the contour of 3D spiral CT damage image,a contour reconstruction method based on sharpening template enhancement for 3D spiral CT damage image is proposed.This method uses the active contour LasSO model to extract the contour feature of the 3D spiral CT damage image and enhances the information by sharpening the template en.hancement technique and makes the noise separation of the 3D spiral CT damage image.The spiral CT image was procesed with ENT,and the statistical shape model of 3D spiral CT damage image was established.The.gradient algorithm is used to decompose the feature to realize the analysis and reconstruction of the contour feature of the 3D spiral CT damage image,so as to improve the adaptive feature matching ability and the ability to locate the abnormal feature points.The simulation results show that in the 3D spiral CT damage image contour reconstruction,the proposed method performs well in the feature matching of the output pixels,shortens the contour reconstruction time by 20/ms,and provides a strong ability to express the image information.The normalized reconstruction error of CES is 30%,which improves the recognition ability of 3D spiral CT damage image,and increases the signal-to noise ratio of peak output by 40 dB over other methods.

Value of Multi-slice Spiral CT in the Diagnosis and Resectability of Pancreatic Cancer

Objective:To analyze the value of multislice spiral CT in the diagnosis and resectability of pancreatic cancer.Method:56 patients with pancreatic cancer treated in our hospital from January 2018 to October 2019 were selected as the research subjects.All patients underwent multi-phase scanning by multislice spiral CT.According to the results of the images,observe whether the pancreatic cancer has affected the blood vessels surrounding the pancreas,evaluate the resectability based on the results of the examination,and analyze the final results of the operation which was taken as the standard.Results:all the 56 cases presented slightly low density or equal density,and 28 cases had complete outline.Multi-slice spiral assessment of patients’vascular invasion types found that 192 branches can be resected with 70 branches cannot;Multi-slice spiral assessment of the main arterial and venous invasion grades around the pancreas of the patients found that 212 branches can be resected with 50 branches cannot;Multi-slice spiral CT was used to evaluate the resectability of pancreatic cancer compared with surgical results.The accuracy of resectable types of vascular invasion was 72.52%;the accuracy of resectable vascular invasion grades was 79.39%.Conclusion:the application of multi-slice spiral CT in the diagnosis of pancreatic cancer can provide a clear understanding of the condition of vascular invasion and distant metastasis,and the accuracy of assessing resection can reach more than 70.00%,which provides a reference for clinical application.

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。

256层螺旋CT与MRI对膝关节隐性创伤骨折的诊断价值观察

目的 分析256层螺旋CT与磁共振成像(MRI)对膝关节隐性创伤骨折的诊断价值。方法选取2019年11月~2023年11月期间收治的膝关节骨折患者86例,回顾性分析其临床资料。所有患者均实施手术治疗,术前实施256层螺旋CT与MRI检查。分析256层螺旋CT与MRI检查对膝关节隐性创伤骨折的诊断价值。结果86例患者中,共79例患者发生膝关节隐性创伤骨折,其中以胫骨近端、腓骨近端、髌骨、股骨远端出现隐性创伤骨折为主。256层螺旋CT检查诊断中,诊断准确度为93.02%,敏感度为93.67%,特异度为85.71%,Kappa值为0.630。MRI检查诊断中,诊断准确度为94.19%,敏感度为94.94%,特异度为85.71%,Kappa值为0.675。结论256层螺旋CT检查与MRI检查诊断膝关节隐性创伤骨折的诊断价值均较高。

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。

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。

踝关节骨折的低剂量螺旋CT影像检查效果

目的 探讨踝关节骨折的低剂量螺旋CT影像检查效果。方法 研究中60例踝关节骨折患者均在2020年1月—2023年7月随机抽选自我院;临床对所有踝关节骨折患者合理展开常规剂量螺旋CT扫描操作以及低剂量螺旋CT扫描操作,对两种方法的辐射剂量、诊断符合率、客观性图像质量指标以及图像清晰度分级展开比较。结果 与常规剂量CT诊断剂量长度乘积(DLP)以及CT容积剂量指数(CTDIvol)展开比较,低剂量CT测定结果均更低(均P <0.05);低剂量CT与常规剂量CT对于总诊断符合率、CT值、噪声值(SD)、图像信噪比(SNR)以及图像清晰度展开比较,结果均未呈现出统计学差异(P> 0.05)。结论 临床对踝关节骨折患者在实施CT诊断期间,发现低剂量CT以及常规剂量CT的诊断效果均较为明显,对于踝关节的损伤位置均可以明确诊断,但低剂量螺旋CT扫描运用,可将辐射剂量显著降低,所以安全性更高。

螺旋CT扫描结核分枝杆菌肺病影像学特点及诊断价值研究

目的研究螺旋CT扫描应用于结核分枝杆菌肺病患者影像学特点和临床诊断价值。方法选取2021年10月—2023年2月本院结核分枝杆菌肺病患者155例作为本次研究对象,采用回顾性分析资料的方式进行研究。所有患者均进行螺旋CT扫描检查,并以病理学、细菌学以及纤维支气管镜诊断作为金标准,分析患者影像学特点、诊断价值。结果分析影像学特点,经螺旋CT扫描检查155例,显示存在斑片浸润征象、散播病灶、条索节结征象、胸膜增厚、多发空洞、肺不张、胸腔积液,其中斑片浸润征象(89.03%)、散播病灶(69.68%)、条索节结征象(63.23%)占比较高。分析诊断价值,经金标准检查出阳性120例,阴性35例。采用螺旋CT扫描后,检查出阳性117例,阴性32例。经螺旋CT扫描诊断,阳性检出率(77.42%)、灵敏度(97.50%)、特异度(91.43%)、阳性预测值(97.50%)、阴性预测值(91.43%),其与金标准对比,差异无统计学意义(P>0.05)。诊断符合率(96.13%)虽然与金标准对比,差异无统计学意义(P>0.05)。结论针对结核分枝杆菌肺病患者,实施螺旋CT扫描能够尽早较为精确诊断,诊断效果较高,可较为清晰观察影像学特点,具有重要参考价值,有利于为患者尽快制定治疗方案,在临床诊断方案中值得大力实施以及推广。

IVIM-DWI及多层螺旋CT与肝细胞肝癌微血管侵犯的相关性分析

目的探究体素内不相干运动扩散加权成像(IVIM-DWI)多层螺旋CT(MSCT)与肝细胞肝癌(HCC)微血管侵犯(MVI)的相关性分析。方法选取2019年12月至2022年12月本院收治HCC患者100例临床资料开展回顾性分析。所有患者均经过病理检查、VIM-DWI检查与MSCT检查。100例患者经手术病理确诊为MVI阳性38例,MVI阴性62例。比较两组IVIM-DWI、MSCT定性、定量参数分析的差异,并通过ROC曲线分析IVIM-DWI定量参数、MSCT定量参数及联合数据对HCC存在MVI的诊断价值。结果MVI阳性组边缘毛糙、瘤周低信号、瘤周强化、存在晕征高于MVI阴性组(P<0.05),肿瘤包膜低于MVI阴性组(P<0.05)。两组D、F比较差异无统计学意义(P>0.05),但MVI阳性组ADC、D低于MVI阴性组(P<0.05)。MVI阳性组动脉期CT值低于MVI阴性组(P<0.05),延迟期CT值、门静脉期CT值、肿瘤大小高于MVI阴性组(P<0.05)。ROC曲线分析显示,ADC、D、D、f、延迟期CT值、门静脉期CT值、动脉期CT值、肿瘤大小诊断HCC存在MVI的AUC分别为0.775、0.856、0.609、0.565、0.708、0.728、0.643、0.705。MSCT参数、IVIM-DWI参数、联合数据诊断HCC存在MVI的AUC分别为0.809、0.832、0.920,均具有较好准确性。结论IVIM-DWI、MSCT定性、定量参数均与HCC患者MVI相关,而IVIMDWI、MSCT诊断MVI均具有一定价值,且联合诊断准确性更高。

CT扫描中非标准定位像对图像质量和辐射剂量影响的模体研究

目的通过模体实验探讨非标准定位像对螺旋CT扫描图像质量和辐射剂量的影响。方法利用包含模体的标准定位像扫描模体并获得基线组图像,利用包含模体、注射器的非标准定位像扫描模体并获得非基线组图像。比较2组图像的质量参数:噪声、CT值线性(3种材料:特氟隆,聚乙烯,空气)、密度分辨率和空间分辨率;比较2组扫描协议中的剂量相关参数:有效毫安秒(Effective Milliampere Seconds,eff.mAs)、CT容积剂量指数(CT Dose Index Volume,CTDIvol)。结果噪声方面,基线组显示低于非基线组(P<0.05);CT值线性方面,基线组较非基线组更接近标准CT值(P<0.05);密度分辨率方面,基线组可识别的最小孔阵直径显著小于非基线组(P<0.05);2组空间分辨率比较差异无统计学意义(P>0.05);eff.mAs和CTDIvol在2组扫描协议的比较中,非基线组均高于基线组(P值均<0.05)。结论螺旋CT扫描中标准定位像的使用可以较低辐射剂量来满足图像质量要求;非标准定位像的使用既提高了辐射剂量,也损害了图像质量。

The diagnostic value of 3D spiral CT imaging of cholangiopancreatic ducts on obstructive jaundice

Objective: Computerized tomography (CT) plays an important role in the diagnosis of diseases of biliary tract. Recently, three dimensions (3D) spiral CT imaging has been used in surgical diseases gradually. This study was designed to evaluate the diagnostic value of 3D spiral CT imaging of cholangiopancreatic ducts on obstructive jaundice. Methods: Thirty patients with obstructive jaundice had received B-mode ultrasonography, CT, percutaneous transhepatic cholangiography (PTC) or endoscopic retrograde cholangiopancreatography (ERCP), and 3D spiral CT imaging of cholangiopancreatic ducts preoperatively. Then the diagnose accordance rate of these examinational methods were compared after operations. Results: The diagnose accordance rate of 3D spiral CT imaging of cholangiopancreatic ducts was higher than those of B-mode ultrasonography, CT, or single PTC or ERCP, which showed clear images of bile duct tree and pathological changes. As to malignant obstructive jaundice, this examinational technique could clearly display the adjacent relationship between tumor and liver tissue, biliary ducts, blood vessels, and intrahepatic metastases. Conclusion: 3D spiral CT imaging of cholangiopancreatic ducts has significant value for obstructive diseases of biliary ducts, which provides effective evidence for the feasibility of tumor-resection and surgical options.

对比分析MRI与MSCT对膝关节隐匿性骨折的诊断价值

目的对比膝关节隐匿性骨折采用磁共振成像(MRI)、多层螺旋CT(MSCT)的诊断价值。方法选取医院2021年1月~2023年1月收治的疑似膝关节隐匿性骨折患者78例,且经关节镜检查,统计所有患者关节镜检查结果,以关节镜检查结果为金标准,分析膝关节隐匿性骨折采取MSCT与MRI诊断的价值。结果78例患者经关节镜检查,发现有60例确诊为膝关节隐匿性骨折,包括胫骨外侧平台骨折8例,股骨远端骨折26例,胫骨内侧平台骨折13例,髌骨骨折13例;18例膝关节周围软组织损伤;膝关节隐匿性骨折采取MRI诊断的特异度、准确性、阴性预测值、灵敏度及阳性预测值均比MSCT高(P<0.05);MSCT诊断膝关节隐匿性骨折与关节镜检查结果一致性K值为0.474,较为理想;MRI诊断膝关节隐匿性骨折与关节镜检查结果一致性K值为0.816,一致性极好。结论与MSCT相比较,膝关节隐匿性骨折使用MRI诊断的有较高的一致性、特异度、准确性、阴性预测值、灵敏度及阳性预测值。

不同剂量的多层螺旋CT尿路造影在输尿管结石中的诊断价值

目的:分析不同剂量多层螺旋CT尿路造影(MSCTU)在输尿管结石中的诊断价值。方法:回顾性分析2019年6月至2021年6月我院确诊的91例输尿管结石患者,均接受低剂量和常规剂量MSCTU诊断,以手术病理为金标准,对低剂量和常规剂量MSCTU诊断输尿管结石的诊断效能进行分析,并分析低剂量和常规剂量MSCTU的图像质量和扫描参数。结果:低剂量MSCTU诊断输尿管结石的准确率、灵敏度和漏诊率分别为95.60%(87/91)、95.60%(87/91)和4.40%(4/91),常规剂量MSCTU诊断输尿管结石的准确率、灵敏度和漏诊率分别为97.82%(89/91)、97.82%(89/91)和2.20%(2/91),组间差异无统计学意义(χ^(2)=0.689、0.689、0.689,P=0.406、0.406、0.406,P>0.05);低剂量和常规剂量MSCTU诊断输尿管结石图像质量的优良率分别为87.91%(80/91)和93.41%(85/91),组间差异无统计学意义(χ^(2)=1.622,P=0.203,P>0.05);低剂量MSCTU扫描的CT剂量指数、CT辐射剂量和剂量长度乘积[(34.38±6.18)mGy、(20.46±4.87)mGy和(42.34±8.92)mGy·cm]均小于常规剂量MSCTU扫描[(39.65±7.69)mGy、(29.68±5.24)mGy和(75.39±10.26)mGy·cm],组间差异具有统计学意义(t=5.096、12.295、23.190,P=0.000、0.000、0.000,P<0.05)。结论:在输尿管结石诊断中应用低剂量MSCTU的临床价值良好,诊断效能和图像质量良好,且可有效减轻CT辐射对人体的影响。