Abstract: A rechargeable tissue stimulating system with a telemetry controlled power source. A constant current power source acting through an induction coil externally located with respect to a living patient is used to induce current flow in a charging circuit located beneath the skin of the patient. The charging circuit, in turn, recharges a battery which powers an electronic generator used for applying electrical pulses to stimulate living tissue in order to maintain bodily functions in the patient. A telemetry circuit connected to the charging circuit provides a magnetic output signal controlling externally located means associated with the power source.

Abstract: Method and apparatus for analyzing blood or other biological fluids containing cells or particles of interest by passing them sequentially through a narrow flow chamber where a repetitive physical stimulus, such as a plurality of beams of light, is spaced at intervals to form a code along the length of the flow chamber to elicit responses from the particles. These responses are then decoded and used to classify the particles according to type.

Abstract: A scintillation camera for use in radioisotope imaging to determine the concentration of radionuclides in a two-dimensional area in which means is provided for second order positional resolution. The phototubes, which normally provide only a single order of resolution, are modified to provide second order positional resolution of radiation within an object positioned for viewing by the scintillation camera. The phototubes are modified in that multiple anodes are provided to receive signals from the photocathode in a manner such that each anode is particularly responsive to photoemissions from a limited portion of the photocathode. Resolution of radioactive events appearing as an output of this scintillation camera is thereby improved.

Abstract: A gamma ray camera system, such as an Anger-type camera, fitted with a collimator comprising an arrangement of straight and corrugated strips of lead foil. One embodiment comprises a parallel multi-channel collimator employing corrugated strips with regular, parallel corrugations. A second embodiment comprises a focusing multi-channel collimator employing corrugated strips having corrugations which focus substantially to a common point and are generally wider and deeper on the side more remote from said common point.

Abstract: Disclosed is a method for making corrugated collimators for radiation imaging devices. Strips of lead foil are corrugated in a pair of gear-like members, and the corrugated strips are mounted between straight strips to build up a honeycomb-like collimator structure. Specific techniques for producing parallel channel and converging or diverging channel collimators are illustrated.

Abstract: A means for determining counting efficiency in a liquid scintillation system. Pulse amplitudes are accumulated as are the number of pulses contributing thereto. The accumulated pulse amplitude sum is divided by the accumulated number of pulses to produce an average pulse amplitude for the pulses measured. The average pulse amplitude may be correlated to average detection efficiency by an ascertainable function. Through average efficiency of detection the actual rate of radioactive disintegrations may be computed from the count rate measured.