NEW METHOD OF MULTIPLANAR EMISSION TOMOGRAPHY USING A 7 PINHOLE COLLIMATOR AND AN ANGER SCINTILLATION CAMERA

  • 1 January 1978
    • journal article
    • research article
    • Vol. 19  (6) , 648-654
Abstract
A new method of multiplanar emission tomography is described; it uses a wide-field Anger scintillation camera (37.5 cm crystal diameter) and a 7-pinhole collimator. The pinholes (5.5 mm) acquire data simultaneously from the emissing source and project the data onto 7 independent regions of the camera crystal. Multiple planes are reconstructed from the initial 7-view data acquisition through the use of a computerized addition-multiplication algorithm and variation of the superposition relationships among the projected views. These planes are then altered iteratively by a least-error criterion following ray-sum comparison with the original views. Planar resolution (full-width-half-maximum) is 1.0 cm and depth resolution is 1.5 cm. In 42 patients, with angiographically demonstrated coronary-artery disease, studies of myocardial 201Tl perfusion, under exercise, showed improved detection sensitivity in comparison with scintigraphy using parallel-hole collimation.