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Computer Applications |
1 From the Departments of Radiology (K.D.H., A.T.I., S.W.W., C.J.K.) and Health Evaluation Sciences (D.T.M.), Milton S. Hershey Medical Center, Pennsylvania State University, 500 University Dr, Hershey, PA 17033; and the Department of Radiology, Geisinger Wyoming Valley Hospital, Wilkes Barre, Pa (J.D.N.). Received January 7, 1998; revision requested April 2; revision received April 13, 1999; accepted June 10. Address reprint requests to K.D.H. (e-mail: khopper@psu.edu).
PURPOSE: To evaluate computed tomographic virtual reality with volumetric versus surface rendering.
MATERIALS AND METHODS: Virtual reality images were reconstructed for 27 normal or pathologic colonic, gastric, or bronchial structures in four ways: the transition zone (a) reconstructed separately from the wall by using volume rendering; (b) with attenuation equal to air; (c) with attenuation equal to wall (soft tissue); (d) with attenuation halfway between air and wall. The four reconstructed images were randomized. Four experienced imagers blinded to the reconstruction graded them from best to worst with predetermined criteria.
RESULTS: All readers rated images with the transition zone as a separate structure as overwhelmingly superior (P < .001): Nineteen cases had complete concurrence among all readers. The best of the surface-rendering reconstructions had the transition zone attenuation equal to the wall attenuation (P < .001). The third best reconstruction had the transition zone attenuation equal to the air attenuation, and the worst had the transition zone attenuation halfway between the air and wall attenuation.
CONCLUSION: Virtual reality is best with volume rendering, with the transition zone (mucosa) between the wall and air reconstructed as a separate structure.
Index terms: Bronchi, CT, 671.12117 • Colon, CT, 75.12117 • Computed tomography (CT), image quality, 671.12117, 72.12117, 75.12117 • Computed tomography (CT), three-dimensional, 671.12117, 72.12117, 75.12117 • Computed tomography (CT), volume rendering, 671.12117, 72.12117, 75.12117 • Images, processing, 671.12117, 72.12117, 75.12117 • Stomach, CT, 72.12117 • Trachea, CT, 671.12117
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