Abstract: A signal processor for use in a system including a gamma camera and a cathode ray tube type display device for displaying the distribution of a radioactive pharmaceutical on X-ray film. The system incorporates a sample-and-hold circuit for extending the duration of each output pulse produced by the camera upon impingement of a radioactive particle. The extended pulses cause the X-ray film to be exposed for a longer period of time by the display apparatus, thereby allowing beam current in the tube to be reduced for smaller spot size and improved resolution in the image.

Abstract: Camera for photographing an oscilloscope screen or a cathode-ray tube including a housing having a lens mounted therein with a first opening on one side of the lens for aligning with the oscilloscope screen and a second opening at the other side of the lens for receiving a film cassette. Magnetic means is provided for mounting the film cassette on the camera housing at the second opening including a strip of flexible or resilient magnet material about the opening and a strip of magnetic material on the film cassette.