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Electronic Device Corrects for Motion in Gamma Camera Images

University of California, Santa Barbara, and Cancer Foundation of Santa Barbara, Santa Barbara, California

Correspondence: For reprints contact: V. B. Elings, Dept. of Physics, University of California, Santa Barbara, Calif. 93106.

ABSTRACT

Previous efforts to remove motion artifacts from gamma camera images have required access to a computer, mechanical linkage to the patient, or a high counting rate. An instrument which does not have these limitations has been built and tested.

The device operates by using the Anger camera's x- and y-coordinate signals to hold the cathode-ray tube display stationary regardless of any motion of the source in front of the crystal. As the counting rate is decreased to zero, the device automatically ceases to stabilize the image and it appears as normal. The instrument is straightforward to operate. No external counting rate dependent adjustments are required.

Preliminary phantom studies have shown that the instrument effectively tracks and corrects for motion. Corrected views of a moving phantom appear almost identical to normal views of a stationary phantom. The instrument has been evaluated in two medical centers, and both have found it useful for sharpening liver scintigrams.