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Spatial resolution of pinhole single photon emission computed tomography imaging

Dai Qiu-Sheng Qi Yu-Jin

Spatial resolution of pinhole single photon emission computed tomography imaging

Dai Qiu-Sheng, Qi Yu-Jin
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  • Abstract views:  3963
  • PDF Downloads:  795
  • Cited By: 0
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  • Received Date:  28 April 2009
  • Accepted Date:  04 June 2009
  • Published Online:  15 February 2010

Spatial resolution of pinhole single photon emission computed tomography imaging

  • 1. 中国科学院上海应用物理研究所,上海 201800

Abstract: The spatial resolution of pinhole single photon emission computed tomography (SPECT) imaging is usually estimated according to Anger’s empirical formula, which could result in a large inaccuracy in experimental measurement. We present a more accurate formula based on the analysis of physical processes of pinhole imaging. The effectiveness of the proposed formula was evaluated by accurate Monte Carlo simulations and experiments of the phantom imaging. The images were reconstructed using three\|dimensional iterative OSEM algorithm. Then the effects of the voxel size, the geometrical mapping of the projection matrix and the ratio of detector size to imaging object size, on the spatial resolution were discussed. The experiment results show that the spatial resolution estimated by the proposed formula is about 10% smaller than the experimental value while the estimation by the Anger’s formula is about 60% larger than the experimental value. Therefore, our proposed formula is more accurate than Anger’s formula for predicting the spatial resolution of pinhole SPECT imaging, and it can be utilized for design and use of pinhole SPECT system.

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