Digital image processing plays a more and more important role in the development

of gamma cameras.

• Modern gamma cameras apply real-time, position-dependent digital corrections to com­pensate for various degrading factors, such as differences in signal amplification (energy correction), geometric distortions (linearity correction), and the remaining differences in sensitivity (uniformity correction).

• So-called full digital cameras digitize the output of each PMT directly, and then all the rest of the processing, including the calculation of coordinates and corrections, is done by the computer.