Linearity and image uniformity of the VistaTM optical cone beam scanner

Abstract

Several optical computed tomography (CT) scanner geometries have been demonstrated for application to 3D gel dosimetry. The scanners fall into two classes: single-ray detector and broad beam - array detector. Two broad beam geometries, divergent cone beam and collimated beam are posssible and each geometry has features worth evaluating. This report is an initial evaluation of the VistaTM optical cone beam scanner (Modus Medical Devices, London Canada). Results from this first research model will assist is identifying improvements required to make a system for accurate clinical 3D gel dosimetry.