Gamma camera error correction using multiple point sources
First Claim
1. A method for adjusting the accuracy of detected event locations in a gamma camera system comprising:
- positioning a plurality of point sources in the field-of-view of the camera;
acquiring event data from the point sources from a plurality of detector positions;
processing the event data to produce translational and rotational alignment adjustments; and
producing gamma camera image information adjusted in accordance with the translational and rotational alignment adjustments.
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Accused Products
Abstract
A gamma camera system and method are described which use multiple point sources to detect inaccuracies in detector translational and rotational alignment. In practice of the method of the preferred embodiment, three capillary tubes, each containing a drop of an isotope, are located in different planes and locations with respect to the axis of rotation of the detectors. A SPECT acquisition is performed and the point source projection data is processed to calculate the point source coordinates, from which center-of-rotation correction factors may be calculated. These correction factors are applied by mechanical and software adjustments to the gantry and acquisition systems of the camera to correct for both translational and rotational inaccuracies.
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Citations
16 Claims
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1. A method for adjusting the accuracy of detected event locations in a gamma camera system comprising:
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positioning a plurality of point sources in the field-of-view of the camera;
acquiring event data from the point sources from a plurality of detector positions;
processing the event data to produce translational and rotational alignment adjustments; and
producing gamma camera image information adjusted in accordance with the translational and rotational alignment adjustments. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A gamma camera system which can be compensated for errors in detector head translation and rotation comprising:
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a plurality of detector heads defining a field-of-view;
a plurality of point sources positioned in the field-of-view;
a gantry which acts to move the detector heads to different detector head positions during acquisition of event data from the point sources;
an event data processor which acts to process the event data from the plurality of point sources to produce translational and rotational error information; and
an image processor which acts to produce a gamma camera image compensated by the error information. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification