Patent ID: 6144876
Filing Date: 2000-11-07
Classification: A61B

Abstract:
A system for detecting and locating sources of radiation at a region of interest, comprising:a probe moveable within said region of interest to provide a pulsed output corresponding with radiation from said source;a readout responsive to a readout input for providing a perceptive output;a signal treatment network responsive to validate said pulsed outputs to provide count signals;a control circuit including circular memory having bins from first to last for retaining memory segment count values, responsive to said count signals during consecutive scan intervals to derive corresponding successive count values for retention as said memory segment count values, responsive with respect to a given said scan interval to compare the count sum value, CS, represented by a predetermined number of said memory segment count values derived over a count period, T, with a window defining upper edge value, UT, said window having a lower edge value, LT, responsive when said count sum, CS, is greater than said upper edge value, UT, to adjust said window in accordance with the expressions: ##EQU5## where RM is reported mean and FWF is a statistically significant floating window factor, responsive when said count sum, CS, is less than said lower edge value, LT, to adjust said window in accordance with the expressions: ##EQU6## and responsive to provide said readout input in correspondence with the expression:RM/T.