Abstract: A gamma camera system having a small field of view that includes a plurality of modules, a module support board on which the modules are mounted, a module interface board, signal amplifier and detection logic mounted on the module support board, a computer interface board mounted in a computer and connected to an internal bus in the computer, and a serial connection between the module support board and the computer interface board. Each module includes a scintillation crystal array, a photodiode array coupled to the scintillation crystal array, a first PETRIC circuit coupled to the array of photodiodes in parallel to determine the crystal of highest peak analog signal and its address in the array and provide an output thereof. A second PETRIC circuit receives the analog outputs of the first PETRIC circuits and determines the crystal of the highest peak analog signal of all the modules and its address in the arrays and provides an output thereof.

Abstract: An ambulatory physiological evaluation system including a main and background gamma radiation detector provided in a vestlike garment worn by a patient for the purpose of monitoring and/or diagnosing the patient's physiological activities during a prescribed period of time. Also included is an apparatus and method for determining the exact location of the left ventricle of the heart, positioning the main radiation detector relative to the left ventricle, and maintaining the position of the main radiation detector relative to the left ventricle during an ambulatory study period. The ambulatory physiological evaluation system also contains electronic circuitry which monitors and processses information obtained from the radiation detectors. Information from the main and auxiliary detectors, as well as ECG electrodes is recorded on a portable cassette recorder.

Abstract: An ambulatory physiological evaluation system including a main and a background gamma radiation detector provided in a vestlike garment worn by a patient for the purpose of monitoring and/or diagnosing the patient's physiological activities during a prescribed period of time. Also included is an apparatus and method for determining the exact location of the left ventricle of the heart, positioning the main radiation detector relative to the left ventricle, and maintaining the position of the main radiation detector relative to the left ventricle during an ambulatory study period. The ambulatory physiological evaluation system also contains electronic circuitry which monitors and processes information obtained from the radiation detectors. Information from the main and auxiliary detectors, as well as ECG electrodes is recorded on a portable cassette recorder.

Abstract: An ambulatory physiological evaluation system including a main and a background gamma radiation detector provided in a vestlike garment worn by a patient for the purpose of monitoring and/or diagnosing the patient's physiological activities during a prescribed period of time. Also included is an apparatus and method for determining the exact location of the left ventricle of the heart, positioning the main radiation detector relative to the left ventricle, and maintaining the position of the main radiation detector relative to the left ventricle during an ambulatory study period. The ambulatory physiological evaluation system also contains electronic circuitry which monitors and processes information obtained from the radiation detectors. Information from the main and auxiliary detectors, as well as ECG electrodes is recorded on a portable cassette recorder.