Collimator characteristics for radioisotope scanning.

For scintigraphic instruments such as scanners and scintillation cameras, collimatore with greatly dif ferent characteristics have become available during recent years. In general little information is given concerning the performance of focused collimatore to the physician or physicist who has to select the proper collimator for a particular application.! Only the number of holes, the focal length and the spatial resolution of the collimator at the focal plane are provided by most manufacturers. The present paper describes briefly the funda mental parameters of collimator-detector systems and their significance. The characteristics of colli matore for some commercial scanners are given and corresponding data for other makes of scanners as well as for scintillation cameras should become avail able shortly.