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Virtual CT Intravascular Endoscopy of the Aorta: Pierced Surface and Floating Shape Thresholding Artifacts¹

¹ From the Department of Oncology, Diagnostic and Interventional Radiology, University of Pisa, Via Roma 67, I-56100 Pisa, Italy. Received December 15, 1997; revision requested March 2, 1998; final revision received November 6; accepted January 19, 1999. Address reprint requests to E.N. (e-mail: neri@do.med.unipi.it).

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 r 0.86) for floating shape. An artifact-free threshold range can be predicted on the basis of aortic enhancement.

Index terms: Aorta, CT, 56.12115, 56.12116, 56.12117 • Aortography, virtual, 56.12117 • Computed tomography (CT), image display and recording, 56.12116, 56.12117 • Computed tomography (CT), three-dimensional, 56.12117

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