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American Journal of Roentgenology, Vol 96, 731-736, Copyright © 1966 by American Roentgen Ray Society

DESIGN AND TESTING OF COLLIMATORS FOR EXTERNAL COUNTING OF Co57 B12 IN THE HUMAN LIVER

B. T. MOORE M.A.1 and JANE G. HEGEMAN 1

1 From the Radioisotope Service, Veterans Administration Hospital, Albany, New York

The design and testing of collimators are described and illustrated. The geometric field of the collimator is analyzed in terms of optics. The isoresponse curve is treated as a near parabola and its approximate volume is calculated as a volume of revolution. The count rate obtained during external scintillation counting of organs is shown to be a function of the type of collimator, probe position, probe angle, and bordering and underlying organs. Results show that in long term organ counting studies, data can only be of value when the probe position is geometrically fixed and recorded for subsequent counting. This should be done in the X and Y planes. Results further show that the quantitative comparison of patient data may be unwise.


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Copyright © 1966 by the American Roentgen Ray Society.