JPS55166065A - Scintillation camera apparatus - Google Patents

Abstract

PURPOSE: To introduce a position to be inspected into an optinum area in a scintillation camera apparatus by subtracting the number of incident radiation of an area to be photographed which is initially set from that in an interested area by utilizing the fact that the RI distribution density in the vicinity of the interesting area becomes large when the interested area approaches the distributed area of the position to be inspected.

CONSTITUTION: A divider 9 receives counted values MO, M from a preset counter 5 and a main counter 8 and calculates preset (MO-M)/MO, and applies the resultant output signal to a third comparator 10. The comparator 10 includes as a reference value a certain threshold value T, and compares the resultant calculated result with the value T, and produces an output signal to an interesting area controlling circuit 6 if (MO-M)/MO<T. The controlling circuit 6 so controls as to reduce the interesting area in the amount preset and to produce the zones of newly interesting areas by signals XL, XH, YL, YH and to apply them to the comparator 7. The comparator 7 feeds the unblanking signal UNB in a signal calculator 2 to the counter 8 when the former is of newly interesting area.

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