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Gamma camera systems that produce cross-sectional slices of the in vivo distribution of an administered radiopharmaceutical in the body, acquired at various angles around the patient and displayed as a computer-reconstructed tomographic image. These systems typically include a mechanical gantry to support and rotate the camera head and collimators in a circular or elliptical orbit around the body. Systems with multiple camera heads and/or coincidence imaging capabilities are also available. Single photon emission tomography systems are mostly used for whole-body bone imaging, brain perfusion studies, and cardiac imaging.
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