Virtual CT intravascular endoscopy of the aorta: pierced surface and floating shape thresholding artifacts.
Two types of artifacts may appear in virtual computed tomographic endoscopic views of the aorta rendered at different threshold levels: pierced surface and floating shape artifacts. A positive correlation was found between mean attenuation of the aorta and the threshold levels at which these artifacts appeared. The correlation was statistically significant (0.71 < or = r < or = 0.86) for floating shape. An artifact-free threshold range can be predicted on the basis of aortic enhancement.
Department of Oncology, Diagnostic and Interventional Radiology, University of Pisa, Italy. neri@do.med.unipi.it
E
E
Neri
D
D
Caramella
F
F
Falaschi
P
P
Sbragia
C
C
Vignali
E
E
Laiolo
A
A
Viviani
C
C
Bartolozzi
D000328:Adult; D000368:Aged; D020677:Angioscopes; D001012:Aorta, Abdominal / Q000000981:diagnostic imaging; D001013:Aorta, Thoracic / Q000000981:diagnostic imaging; D001018:Aortic Diseases / Q000000981:diagnostic imaging*; D016477:Artifacts; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000295:instrumentation*; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed / Q000295:instrumentation*; D014584:User-Computer Interface