Apparatus and method for nuclear camera calibration
AssigneeTrionix Research Laboratory, Inc.
InventorsChun B. Lim, Barry D. Kline, Jinghua J. Jiang, Vitaliy Rappoport
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Abstract
A gamma camera is calibrated at different photon energies to provide several different calibration arrays. The calibration arrays are used to correct the camera image according to the energy of the photons detected from the body to be examined. The calibration array obtained from the photons having an energy closest to the photons detected from the body may be used. Another alternative is to form an interpolation array based on two or more calibration arrays obtained with photons having energies bracketing those from the body.
Claims10
A method for operating a gamma camera for detecting photons of a known energy emitted from a radioisotope given to a body to be examined, said camera having a detector, said method comprising:
- illuminating said detector with calibration photons having a first energy;
- determining a first calibration array in response to said first energy photons;
- illuminating said detector with calibration photons having a second energy different from said first energy;
- determining a second calibration array in response to said second energy photons;
- detecting photons from said body with said detector in an imaging array;
- and
- correcting said imaging array in accordance with said calibration arrays.
A gamma camera for detecting photons of a known energy emitted from a radioisotope given to a body to be examined, said camera comprising:
- a detector for detecting photons;
- a first memory for storing a first calibration array;
- a second memory for storing a second calibration array;
- a calibration controller for determining said first and second calibration arrays from detection of calibration photons having a first energy and calibration photons having a second energy, respectively, said first energy being different from said second energy;
- and
- an energy correction processor for correcting an imaging array detected from said body, said imaging array being corrected in accordance with said calibration arrays.
Dependencies are inferred from the claim text.