A MICROCOMPUTER-BASED CT AND DIGITAL FLUOROGRAPHY SYSTEM FOR RADIOTHERAPY SIMULATORS

A low cost system designed to produce low resolution CT images from a radiotherapy treatment simulator is described. The system is based upo n a standard micro-computer and operates using the simulator's image i ntensifier as the CT detector. The resulting images are intended to su pply cross-sectional anatomical information appropriate for the applic ation of inhomogeneity corrections to treatment plans for megavoltage radiotherapy of the thorax. Options for digital fluorography and hold- last-frame fluoroscopy are also described. Examples of clinical images are presented.