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Combined half-cone beam and parallel hole collimation system for SPECT brain imaging

Publication ,  Conference
Stone, CD; Smith, MF; Greer, KL; Jaszczak, RJ
Published in: IEEE Nuclear Science Symposium & Medical Imaging Conference
December 1, 1997

Our research group has recently examined new types of collimator designs with the goal of improving sensitivity and lesion detection for head imaging. One of these collimator designs is a half-cone beam collimator. However, the sensitivity is reduced as objects are removed from the focal line and it does not satisfy Tuy's sufficiency condition. A potential solution to this problem is to use one parallel hole collimator in conjunction with two half-cone beam collimators on a triple camera single photon emission computed tomography (SPECT) system. We acquired projection data with a Defrise disk phantom filled with Tc-99m. A half-cone beam collimator with a focal length of 50 cm was placed on one head of a triple camera SPECT system. A low energy super high resolution (LESR) parallel hole collimator was placed on a second head. Different projection data sets were combined to model acquisition in the three headed gamma camera with three half-cone beam collimators, two half-cone beam and one parallel beam collimators and three parallel beam collimators. Image reconstruction used a modified maximum likelihood maximization-expectation (ML-EM) algorithm. For the reconstruction with three half-cone beam collimators, we observe axial blurring. This is eliminated with two half-cone beam and one parallel beam collimators. There is a lack of a sharp boundary along the axial direction of the three half-cone beam collimator configuration as opposed to other collimation configurations that had a well defined boundary.

Duke Scholars

Published In

IEEE Nuclear Science Symposium & Medical Imaging Conference

Publication Date

December 1, 1997

Volume

2

Start / End Page

1313 / 1317
 

Citation

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Stone, C. D., Smith, M. F., Greer, K. L., & Jaszczak, R. J. (1997). Combined half-cone beam and parallel hole collimation system for SPECT brain imaging. In IEEE Nuclear Science Symposium & Medical Imaging Conference (Vol. 2, pp. 1313–1317).
Stone, C. D., M. F. Smith, K. L. Greer, and R. J. Jaszczak. “Combined half-cone beam and parallel hole collimation system for SPECT brain imaging.” In IEEE Nuclear Science Symposium & Medical Imaging Conference, 2:1313–17, 1997.
Stone CD, Smith MF, Greer KL, Jaszczak RJ. Combined half-cone beam and parallel hole collimation system for SPECT brain imaging. In: IEEE Nuclear Science Symposium & Medical Imaging Conference. 1997. p. 1313–7.
Stone, C. D., et al. “Combined half-cone beam and parallel hole collimation system for SPECT brain imaging.” IEEE Nuclear Science Symposium & Medical Imaging Conference, vol. 2, 1997, pp. 1313–17.
Stone CD, Smith MF, Greer KL, Jaszczak RJ. Combined half-cone beam and parallel hole collimation system for SPECT brain imaging. IEEE Nuclear Science Symposium & Medical Imaging Conference. 1997. p. 1313–1317.

Published In

IEEE Nuclear Science Symposium & Medical Imaging Conference

Publication Date

December 1, 1997

Volume

2

Start / End Page

1313 / 1317