title: [CT angiography in arterial occlusive disease: comparison of 3 rendering techniques].
abstract: OBJECTIVE
  To evaluate different rendering techniques of CT data for the assessment of long vessel segments in peripheral vascular occlusive disease.
  
  
  METHODS
  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.
  
  
  RESULTS
  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.
  
  
  CONCLUSIONS
  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.
authors.affiliation: Klinik für Radiologie, Johannes Gutenberg-Universität Mainz.
authors.forename: O
authors.initials: O
authors.lastname: Rieker
authors.forename: P
authors.initials: P
authors.lastname: Mildenberger
authors.forename: A
authors.initials: A
authors.lastname: Neufang
authors.forename: H
authors.initials: H
authors.lastname: von Zitzewitz
authors.forename: F
authors.initials: F
authors.lastname: Schweden
authors.forename: M
authors.initials: M
authors.lastname: Thelen
mesh_terms: D015901:Angiography, Digital Subtraction; D001157:Arterial Occlusive Diseases / Q000000981:diagnostic imaging*; D003937:Diagnosis, Differential; D005069:Evaluation Studies as Topic; D006801:Humans; D007866:Leg / Q000098:blood supply*; D007925:Leriche Syndrome / Q000000981:diagnostic imaging; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed / Q000379:methods*