Data and signal processing techniques in PET
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| To monitor subject movement during PET scans we installed two video cameras which provided a front and profile view of the face during the scan of a Scanditronix PC2048B PET scanner.A video splitter was used to save 1/2 of each image in a TV frame and the image was digitized with a frame grabber. This work was done in the mid 1990's before PET frame grabbers or web-cams were available. | When the subject returned for a follow-up scan, the prior image was displayed in green, and the present image was displayed in red. In this case, the coloured fringes show mis-alignment of the images so the head was moved to provide an uniform image with no coloured fringes. This allowed precise re-positioning for followup scans. The system was also used to track subject movement during long PET scans. | The suject's position was monitored during long dynamic PET scans (which may take an hour to complete). If the subject moved enough to cause the PET image blur, an new data frame was initiated. Later the segments were aligned, corrected for the time spent in each position and decay, then saved as a normal PET image, after compensating for the subject's movment. |