Two-alternative forced choice evaluation of 3-D CT angiograms

Abstract

This study describes the development and evaluation of an appropriate methodology to study observer performance when comparing 2-D and 3-D angiographic techniques. 3D-CT angiograms were obtained from patients with cerebral aneurysms or occlusive carotid artery disease and perspective rendering of this 3-D data was performed to produce maximum intensity projections (MIP) at view angles identical to digital subtraction angiography (DSA) images. Two-alternative-forced-choice methodology (2AFC) was then used to determine the percent correct (Pc), which is equivalent to the area A= under the receiver-operating characteristic (ROC) curve. In a comparison of CRA MIP images and DSA images of the int..