Patent Number: 043485910
Section: abstract

Gamma cameras have been fitted with pinhole collimators mounted at the top of conical shields for enlarging the scintillation image of radioactive organs. According to the disclosure a generally conical pinhole adapter is substituted for the top of the cone.. A generally cylindrical radiation shielding adapter makes possible the efficient utilization of the gamma camera for uptake studies. Only a small portion of the camera's field of view is utilized, thus increasing the count rate and decreasing the length of the study and the amount of radioactive material required to be absorbed by the organ.. A generally cylindrical adapter, also masking off all but a small field of view of the camera, is provided with a plurality of parallel pinholes through radiation shielding material to provide for gamma camera studies of small organs such as the heart. In an alternative embodiment the pinholes diverge in order to provide an enlarged image.. An alternative flat field of view straight bore masking collimator is provided for uptake studies.