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A Hexagonal Bar Positron Camera: Problems and Solutions

As the ability of positron imaging devices to obtain many transverse sections simultaneously with improved spatial resolution has increased, so has the number of scintillation crystals and photomultipliers required. While the PETT III built around 1975 used only 48 crystals and photomultipliers, current state of the art systems under development use 280 or 512 crystals per ring and may have several thousand crystal/photomultiplier assemblies in a complete system. The cost of these complex systems precludes their use in routine diagnostic medicine, restricting their availability to a few research centers. A continuous position-sensitive detector provides a method of avoiding the costly one-resolution element-per-detector design. The authors have investigated position-sensitive one-dimensional scintillation detectors for positron imaging to assess the problems encountered in their use and potential solutions. Special emphasis was placed on avoiding solutions which increased the complexity of the device.