Abstract: A gamma ray collimator assembly for use in a cardiac inspection system. A collimator has a plurality of collimator elements with the collimator walls absorbing gamma rays. The collimator walls have a base layer of a first material covered by a layer of a second material which preferentially absorbs inelastically scattered gamma rays generated in the first material.

Abstract: A collimator assembly for removing selected radiation output from a specimen. The assembly includes collimator elements with each element having walls comprised of a first material covered by an inner layer of a second material which preferentially absorbs inelastic scattered radiation created in the first material.

Abstract: A method and apparatus for motion correction of image information collected by a cardiology inspection system. The cardiology inspection system collects image information from an exercising patient. The system corrects for the patient motion to provide dynamic time segmented images of radioactive dye flow through the patient's cardiac system, removing anomalous displacements from the images and allowing unambiguous evaluation of heart functionality while under physical stress.

Abstract: A radioactivity detection system including a crystal detector formed of a unitary body and having two sensing heads. Each sensing head defines a specific address location in a sensing array having a plurality of detectors. A number of detectors are superposed on the sensing array such that activity in one sensing head activates two adjacent detectors, one more than the other. The system further includes means for mounting the detectors for relative motion with respect to a subject and processing means coupled to the detectors. Preferably, the mounting means is operatively connected to an exercising means for stress analysis. Preferably, the mounting means is secured on a movable platform and is connected to the exercising means by a quick connect-disconnect mechanism. In a further embodiment, a detector assembly is designed for rotation about the subject.