A SPECIAL CUTOFFS GAMMA-CAMERA FOR HIGH-RESOLUTION SPECT OF THE HEAD

  • 1 January 1984
    • journal article
    • research article
    • Vol. 25  (9) , 1023-1030
Abstract
A modern system for single photon emission computerized tomography was modified to optimize examinations of the head. By cutting off part of the detector housing and collimators at 1 edge, it is possible to rotate the camera close to the skull while still covering the entire brain and the skull base. The minimum radius of revolution used in 32 patients was thereby reduced from .apprx. 20 cm to 12.7 .+-. 0.8 cm. This, combined with an adjustment of the 64 .times. 64 matrix to a 26- by 26-cm field of view, resulted in an improvement of the spatial resolution from .apprx. 19 mm to 12.6 .+-. 0.3 mm with a low-energy, all-purpose collimator, and to 10.4 .+-. 0.3 mm (FWHM [full width-half maximum]) with a low-energy, high-resolution collimator. The immproved spatial resolution offers several clinical advantages in studies of the brain, the CSF space, and the skull base.