Movable calibration collimator and system and method using same
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United States of America Patent
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Jun 4, 1991
Grant Date -
N/A
app pub date -
Sep 30, 1988
filing date -
Sep 30, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A movable calibration collimator for a radionuclide emission tomography camera, and a calibration system using same, having a wall of material which is opaque to radionuclide emissions and is movable in a first direction relative to the camera. One or more patterns of openings are defined by the wall to pass radionuclide emissions. The openings of each pattern are aligned in a direction transverse to the first direction to provide an array of camera images upon movement of the wall relative to the camera. The number of images generated for the array are greater than the number of openings. A method of using such a calibration collimator to perform linearity correction involves installing the calibration collimator and a line source of radionuclide emissions, acquiring a camera image of the pattern of openings, and incrementing the calibration collimator for a desired number of increments. Each camera image, collected at each position of the collimator, has a position image for each opening. The camera images are combined to produce an array having a greater number of position images than the numbers of openings. Position estimation made by the camera is corrected based on the correlation between the location of the position images and the position of the openings.
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