Collimator position and the spatial resolution of a gamma camera.

Multi-parallel hole collimators are generally used with a gamma camera. The purpose of this study is to determine the relationship between the collimator position of the gamma camera and its spatial resolution. When the collimator is attached to the camera head, the smaller the distance between the collimator and the crystal face, the better the spatial resolution will be. But, for a set of source to crystal distance, the distance between the source and the collimator makes minimal changes in the spatial resolution. Therefore, when the source position is far from the collimator face, for example 20 cm, the system spatial resolution is minimally affected by the distance between the collimator and the crystal face.