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目的探讨64层螺旋CT血管成像扫描技术,分析多种图像后处理方法的应用价值。方法应用64层螺旋CT,对45例患者行全身各部位CTA检查,其中胸主动脉4例,腹主动脉15例,肺动脉10例,共29例是通过对比剂智能跟踪兴趣区监测来确定扫描延迟时间;颅脑血管4例,颈部血管6例及双下肢动脉6例,共16例采用对比剂智能跟踪目测观察手动触发确定扫描延迟时间。原始图像应用多平面重组(MPR)、曲面重建(CPR)、最大密度投影(MIP)、表面遮盖法(SSD)及立体容积漫游技术(VRT)进行图像后处理重建。结果依据图像质量评定标准,图像质量为优的有37例,为良的有8例,无图像质量为差的病例,并且应用智能跟踪自动触发和手动触发技术的CTA图像均能满足诊断要求。结论就大血管疾病诊断而言,64层螺旋CTA完全可取代DSA,MIP及VRT是2种非常重要的血管后处理方法。
Objective To explore the technique of 64-slice spiral CT angiography and to analyze the application value of various post-processing methods. Methods CTA was performed on all the patients in 45 cases by 64-slice spiral CT. Among them, 4 cases of thoracic aorta, 15 cases of abdominal aorta and 10 cases of pulmonary artery were detected in 29 cases, which were confirmed by the contrast agent intelligent follow- Delayed time; 4 cases of cranial and cerebral vessels, 6 cases of cervical vessels and 6 cases of double lower extremity arteries, a total of 16 cases using contrast agent intelligent tracking visual observation manual trigger to determine the scan delay time. The original image is reconstructed by MPR, CPR, MIP, SSD and VRT. Results According to the image quality evaluation criteria, 37 cases were excellent in image quality, 8 cases were good and no cases were poor in image quality. The CTA images using both automatic tracking and manual triggering techniques could meet the diagnostic requirements. Conclusion In the diagnosis of macrovascular disease, 64-slice spiral CTA can completely replace DSA. MIP and VRT are two important methods of vascular post-treatment.