General purpose dynamic phantom for gated, computer aided gamma camera evaluation

A dynamic phantom with broad applications in testing computer aided gamma camera imaging systems is directed. The phantom employs a rotating disk which may be used to carry a distribution of absorbers or of radioactive sources. The disk is directly driven by a variable speed DC motor with a coupled tachometer for servo-controlled speed regulation. Data are presented for a variety of absorber and source distributions, including simulated cardiac dynamics. The system can be used to validate hardware and software integrity including computer gating circuits, linearity of intensity response, edge detection, and ejection fraction calculations