[54] PULSE PILE-UP DISCRIMINATION SYSTEM
[75] Inventors: Sing C. Pang; Sebastian Genna, both of Belmont, Mass.
[73] Assignee: Digital Scintigraphics, Inc., Belmont, Mass.
[21] Appl. No.: 442,628
[22] Filed: Nov. 18,1982
[51] Int. O* G01T 1/20
[52] U.S. CI 250/366; 250/363 S;
250/369
[58] Field of Search 250/363 S, 369, 366,
250/370, 336.1, 394; 364/414
[56] , References Cited
U.S. PATENT DOCUMENTS
Re. 30,904 4/1982 Miller et al 250/363 S
3,525,047 8/1970 Schwartz 250/369
3,919,556 11/1975 Berninger 250/366
3,984,689 10/1976 Arseneau 250/369
4,217,496 8/1980 Daniels et al 250/369
Primary Examiner—Alfred E. Smith
Assistant Examiner—Carolyn E. Fields
A pulse pile-up discrimination system for a multicell detector accumulates a charge on each cell to detect its response to a radiant emission impinging on an unknown position of the detector; the position of impingement of the radiant emission is established in accordance with the charge on each cell; a pulse pile-up discriminator provides, associated with each impingement position, lower and upper discrimination levels of a function of the distribution of charge on the cells indicative of a pulse pile-up; a function of the distribution of the charge on the cells is generated in response to the radiant emission impinging on the unknown position of the detector; the function of the distribution of charges on the cells in response to the radiant emission impinging on the unknown position of the detectors is compared to the lower and upper discrimination levels of a function of the distribution of charges provided by the pulse pile-up discriminator to determine whether a pulse pile-up has occurred.
4 Claims, 7 Drawing Figures
