Abstract
The authors studied comparatively the detectabilities of space occupying lesions and resolutions of collimators of scintillation camera and rectilinear scanner. The results are followings : 1) The resolution of the pinhole collimator is better than that of the 1,000 hole and 4,000 hole pararell collimator. 2) The detectability of lesion magnifying scintiphotography using of pinhole collimator decreased according as phantom become thick, neverthless it is better than that of the other collimators. The detected smallest space occupying lesion employing the pinhole collimator is 0.75 cm, at 10 cm distance of collimator to focal lesion that is centered in thick-varying phantom. 3) The detected minimum focal lesions in liver phantom using the 1,000 hole pararell collimator attached to the delay line system scintillation camera, 37 hole focusing collimator of rectilinear scanner and 1,000 hole collimator attached to the resistancematrix scintillation camera were 2.8 cm, 2.8 cm and 3.0 cm. And then the pinhole collimator attached to the delay line system scintillation camera detected the 1.9 cm in similiar manner. 4) The resolution of pinhole collimator for high energy gamma ray decreased a little. 5) The detectability of pinhole collimator attached to the delay line system scintillation camera for the lesion in thyroid phantom is better than that of the other equipments, then the smallest lesion was 4 mm in the same way. It is derverse special emphasis that the significances of pinhole collimator in clinical use for the magnifying scintigraphy of small organ and the hot area scintigraphy. Furthermore, it is significantly employing of pinhole collimator for the purpose of detection of space occupying lesion in large organ.
