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(Radiology. 2001;218:893-898.)
© RSNA, 2001

Technical Developments

CT Angiography of the Circle of Willis and Intracranial Internal Carotid Arteries: Maximum Intensity Projection with Matched Mask Bone Elimination—Feasibility Study1

Henk W. Venema, PhD, Frans Jan H. Hulsmans, MD, PhD and Gerard J. den Heeten, MD, PhD

1 From the Departments of Radiology (H.W.V., F.J.H.H., G.J.d.H.) and Medical Physics (H.W.V.), Academic Medical Center, University of Amsterdam, Meibergdreef 9, 1105 AZ Amsterdam, the Netherlands. From the 1999 RSNA scientific assembly. Received January 11, 2000; revision requested February 12; revision received July 11; accepted August 29. Address correspondence to H.W.V. (e-mail: h.w.venema@amc.uva.nl).

Results are reported of a feasibility study in which bone pixels are eliminated from computed tomographic (CT) angiographic images with a method that enables the construction of maximum intensity projection (MIP) images without interference by bone. The method proved to be successful in six patients. Two observers blinded to the bone elimination method judged the image quality of MIP images to be considerably higher than that of standard subtraction MIP images. This method is an effective means to remove bone from CT angiographic images with only a slight increase in radiation dose.

Index terms: Aneurysms, cerebral, 172.73, 175.73 • Cerebral angiography, technology • Computed tomography (CT), angiography, 172.12116, 175.12116 • Computed tomography (CT), maximum intensity projection • Images, processing




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