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.

Predictive Factors of the Presence and Number of Noncalcified Coronary Plaque in Japanese Patients with Zero Coronary Artery Calcium Score Using 64-Slice Multi-Detector Computed Tomography

Background: Factors that can predict the presence and number of noncalcified coronary plaques (NCP) in Japanese patients with zero coronary artery calcium scores (CACS) essentially remain undefined. Methods and Results: We assessed independent predictors of the presence and number of segments with NCP in 111 Japanese patients with zero CACS who underwent 64-slice multi-detector computed tomography at our hospital. Thirty five patients (32%) had NCP, and 24 patients (22%) had ≥ 2 NCPs. Multiple logistic regression analysis revealed that significant predictors for the presence of NCP were age (odds ratio [OR]: 1.06, 95% confidence interval [CI] 1.01 - 1.11, p = 0.021), male (OR: 3.61, 95% CI 1.40 - 9.35, p = 0.008) and diabetes mellitus (OR: 3.10, 95% CI 1.02 - 9.45, p = 0.046), and those for the presence of ≥ 2 NCPs were age (OR: 1.08, 95% CI 1.02 - 1.15, p = 0.007) and a current smoking habit (OR: 5.09, 95% CI 1.00 - 25.74, p = 0.049). Multiple linear regression analysis identified advanced age, male gender and diabetes mellitus as independent predictors of the number of NCPs. A novel score calculated from the above four predictors showed moderate accuracy for a diagnosis of NCP and ≥ 2 NCPs, with areas under receiver operating curves of 0.738 and 0.736, respectively. Conclusions: Male Japanese patients with zero CACS, advanced age, diabetes mellitus and a current smoking habit might have NCPs.

Clinical Effect of Magnetic Resonance Imaging and 64-slice Spiral CT in the Diagnosis of Ischemic Heart Disease Patients

Objective:To explore the clinical methods and clinical effects of applying magnetic resonance imaging(MRI)and 64・slice spiral computed tomography(CT)in the diagnosis of patients with ischemic heart disease.Methods:100 patients with ischemic heart disease were selected as the research objects.Selecting the patients from May 2020 to May 2021 as a sample,the patients were divided into two groups,and different diagnostic methods were used to compare the clinical diagnosis effects.Results:In terms of the diagnostic accuracy of the two groups of patients,the maximum value was 92.00%(experimental group)and the minimum value was 80.00%(control group).There was a big difference in data between the two groups,P<0.05,which was statistically significant.The patient9s(experimental group)diagnosis accuracy rate is highe Conclusion:In the process of research work for patients with ischemic heart disease,it is particularly important to diagnose the patients.The combined application of and 64-slice spiral CT can improve the clinical diagnosis efficiency and achieve significant results.

64排CT双期增强联合MPR对T3和T4期直肠癌的诊断意义

目的探讨64排螺旋CT双期增强联合矢状位、冠状位MPR图像对T3和T4期直肠癌的分期诊断价值。方法两名评价者分别应用CT横断位图像及CT横断位联合MPR图像评价直肠癌T3期27例,T4期15例。对比两种评价方法的差异。结果两名评价者联合MPR图像评价T3、4期直肠癌的ROC曲线下面积、敏感性、特异性及两名评价者一致性分析均明显增加,显著降低不确定分期病例数。两评价方案评价阴道及子宫受侵之间的差异统计学意义。结论双期增强CT横断位联合MPR图像能够更加准确地区分T3期、T4期直肠癌,有助于预测邻近器官受侵及侵犯范围,特别是有助于阴道及子宫受侵的诊断。

Sensation 64 CT探测器隐性故障的检测及排除

文章分析了Sensation64CT机探测器故障的检测及维修软件的使用方法。介绍了利用软件分析手段诊断出探测器隐性故障并加以排除,保障了设备的正常使用的实例。文章最后提出了维修工程师的工作思路转变问题。

64排CT双期增强联合MPR对T3和T4期直肠癌的诊断价值

目的探讨64排螺旋CT双期增强联合矢状位、冠状位多平面重建(MPR)图像对T4期与T3期直肠癌的鉴别诊断价值。方法分别应用CT横断位图像及CT横断位联合MPR图像评价直肠癌T3期27例,T4期15例。选择两名固定评价者,对CT横断位图像及CT横断位联合MPR图像进行评价,比较分析两种评价方法的差异,并对两名评价者评价结果的一致性进行比较。结果与CT横断位图像比较,CT横断位联合MPR图像评价T3期、T4期直肠癌的ROC曲线下面积、敏感性、特异性及两名评价者结果一致性均明显增加,显著降低不确定分期病例数(P<0.05)。在直肠癌阴道及子宫受侵情况的评价中,与CT横断位图像比较,CT横断位图像联合MPR图像的的符合率增加(P<0.05)。结论双期增强CT横断位联合MPR图像能够更加准确地区分T3期、T4期直肠癌,有助于预测邻近器官受侵及侵犯范围,特别是有助于阴道及子宫受侵的诊断。

Efficacy of high resolution computed tomography for detection of early healing in scaphoid fractures

Background: While plain radiography is commonly used to assess scaphoid fracture, this imaging modality may not accurately demonstrate early bone healing. This investigation evaluates the utility of 64-slice CT in the detection of early fracture healing compared to plain radiographs and magnetic resonance imaging (MRI). Methods: Outpatients attending follow-up visits for scaphoid fractures at Hamilton General Hospital were included in this investigation. Inclusion criteria included outpatients over age of 18 who consented to attend a follow-up visit for the scaphoid fracture at 6 weeks for X-Ray, 64-slice CT and MRI scan to monitor fracture healing. Assessment of healing was independently interpreted by two radiologists specialized in musculoskeletal imaging. A total of 7 adult outpatients were accrued, with each case classified as healing, not healing, or equivocal for plain radiography and 64-slice CT scan. Results: For plain radiographs, the level of interrater agreement for evidence of healing was 57% (4/7) cases. When comparing this to CT scans, there was no discrepancy between radiologists as 100% (7/7) were found to have evidence of healing. The 64-slice CT scan demonstrated evidence of early trabecular continuity in all cases, including radiographs that were interpreted as equivocal. Conclusion: This study can be considered a pilot project for the efficacy of 64-slice CT in the assessment of early healing of scaphoid fractures. For clinicians, the multiplanar reconstruction images allows for more accurate assessment of fractures than plain radiography. CT scans are able to penetrate through bony callus that may obscure visualization of healing in plain radiography, demonstrate trabecular continuity better than plain radiographs, are readily accessible and provide faster imaging acquisition. The observations from this study may have implications in terms of duration and type of casting applied, timing of strengthening exercises, and avoiding unnecessary surgery which affect patient morbidity and cost of care.

64层螺旋CT低剂量冠状动脉血管成像方案探讨

目的评价64层螺旋CT低剂量冠状动脉血管成像的价值。方法 2009年1 6月157例患者随机分为3组,常规剂量组(A组)管电流量采用1 000mAs,两个低剂量组(B、C组)分别采用800、600mAs。对3组的图像质量、噪声、CT剂量指数(CTDI)、剂量长度乘积(DLP)和有效剂量(ED)进行评估。结果 A、B、C组图像噪声分别为20.50±3.23、23.02±3.05和26.28±2.58,组间差异均无统计学意义(P>0.05);A、B、C组的CTDI分别为(58.7±0.23)、(46.98±2.27)、(35.28±3.56)mGy,DLP分别为(1 050.88±89.63)、(846.21±57.86)、(641.13±32.15)mGy.cm,ED分别为(14.78±2.56)、(11.85±1.87)、(8.98±1.15)mSv,B、C组的CTDI、DLP、ED均明显低于常规剂量A组(P<0.05),C组的CTDI、DLP、ED均为3组中最低值。结论 64层螺旋CT冠状动脉血管检查,采用600mAs管电流量获得的冠脉图像既可满足诊断需要,又可使患者接受的辐射剂量降低。