Rieker O, Mildenberger P, Neufang A, von Zitzewitz H, Schweden F, Thelen M
Klinik für Radiologie, Johannes Gutenberg-Universität Mainz.
Rofo. 1997 Oct;167(4):361-70. doi: 10.1055/s-2007-1015545.
To evaluate different rendering techniques of CT data for the assessment of long vessel segments in peripheral vascular occlusive disease.
40 CT angiograms (aortoiliac: n = 20, leg arteries: n = 20) were viewed using three different rendering techniques: 1, maximum intensity projection (MIP); 2, volume rendering (VR); 3, shaded surface display (SSD). CT angiograms were obtained in 6 or 8 projections. Axial cross-section images were analysed using an interactive cine mode. Intraarterial DSA was the standard in all cases.
The sensitivities for the diagnosis of occlusive disease were 100% (cross-section images), 94% (MIP), 91% (VR) and 93% (SSD). The specificities were 100%, 99%, 99% and 99%, respectively. For the accurate grading of high-grade (> 75%) stenoses, the sensitivities were 85% (cross-section images), 62% (MIP), 44% (VR) and 35% (SSD). Specificity was 99% for all techniques.
CTA is accurate in occlusive disease. Interactive viewing of cross-section images is the most accurate technique. MIP is superior to VR in the imaging of high-grade stenoses because contrast-to-noise ratio is high and thresholding is not necessary.
评估CT数据的不同渲染技术，用于外周血管闭塞性疾病中长血管段的评估。
使用三种不同的渲染技术查看40例CT血管造影（腹主动脉-髂动脉：n = 20，腿部动脉：n = 20）：1，最大密度投影（MIP）；2，容积再现（VR）；3，表面阴影显示（SSD）。CT血管造影以6或8个投影获得。使用交互式电影模式分析轴向横截面图像。所有病例均以动脉内数字减影血管造影（DSA）为标准。
闭塞性疾病诊断的敏感性分别为100%（横截面图像）、94%（MIP）、91%（VR）和93%（SSD）。特异性分别为100%、99%、99%和99%。对于高级别（>75%）狭窄的准确分级，敏感性分别为85%（横截面图像）、62%（MIP）、44%（VR）和35%（SSD）。所有技术的特异性均为99%。
CT血管造影（CTA）在闭塞性疾病中是准确的。交互式查看横截面图像是最准确的技术。在高级别狭窄的成像中，MIP优于VR，因为对比噪声比高且无需阈值处理。
