| 摘要 |
A PET scanner includes an orbiting source of positron emissions which is employed in an attenuation scan to collect attenuation data used to correct image data acquired during an emission scan. In addition, the orbiting source is used in a coincidence timing calibration scan to acquire timing information employed to calibrate the scanner electronics. Time-of-flight errors in the calibration timing information due to the use of an off-center emissions source are eliminated by a sorter which separates the timing data as a function of the position of the orbiting source.
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