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Standardized Evaluation of CT Angiography with Remote Generation of 3D Video Sequences for the Detection of Intracranial Aneurysms

¹ From the Departments of Neuroradiology (B.F.T., N.C.K., M.S., W.J.H.) and Neurosurgery (P.H., C.S., J.R.), University of Erlangen-Nuremberg, Germany; and the Visualization and Interactive Systems Group, University of Stuttgart, Germany (S.I-B., T.E.). Presented as a scientific exhibit at the 2001 RSNA scientific assembly. Received September 18, 2002, revision requested October 22, revision received and accepted October 23. Address correspondence to B.F.T. (e-mail: tomandl@neuroradiologie-erlangen.de).

Computed tomography (CT) angiography is a well-known imaging technique commonly applied to both the detection and therapy planning of intracranial aneurysms. For this purpose, current studies predominantly focus on three-dimensional (3D) representations of CT angiographic volumes obtained with varying visualization approaches on different computers. Interactive manipulation performed by users individually is an important prerequisite for data analysis. However, this leads to inconsistent and barely reproducible 3D visualization results. Furthermore, the quality of any 3D representation depends on the applied visualization strategy (eg, maximum-intensity projection, shaded-surface display, direct volume rendering). To overcome these limitations, the authors present a novel method for standardized visualization of CT angiographic volumes, consisting of three steps: (a) transfer of the image data to a remote high-end graphics workstation, (b) automatic 3D visualization with high-resolution direct volume rendering, and (c) consecutive video generation performed according to a standardized protocol. The recorded video sequences are transferred for evaluation to a local desktop computer. In the experimental setup, high-quality videos based on 3D visualizations were produced in less than 60 minutes per patient. Although aneurysms above the skull base are usually visualized with excellent quality, the analysis of aneurysms at the skull base is still difficult.

© RSNA, 2002

Index Terms: Aneurysm, CT, 17.12112, 17.12115, 17.12116, 17.12117 • Aneurysm, intracranial, 17.73 • Cerebral blood vessels, CT, 17.12112, 17.12115, 17.12116, 17.12117 • Computed tomography (CT), three-dimensional, 17.12117

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