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System Response Matrix Calculation Based on Distance-Driven Model and Solid Angle Model for Dual-Head PET System | IEEE Journals & Magazine | IEEE Xplore

System Response Matrix Calculation Based on Distance-Driven Model and Solid Angle Model for Dual-Head PET System


Abstract:

The dual-head positron emission tomography (PET) systems have an importance role in the preclinical and clinical applications. This paper focuses on developing a simplifi...Show More

Abstract:

The dual-head positron emission tomography (PET) systems have an importance role in the preclinical and clinical applications. This paper focuses on developing a simplified model based on distance-driven (DD) and solid angle method to calculate the system response matrix (SRM) for the dual-head PET system. The subsampling schemes, including the subvoxel scheme and multi-DD scheme were introduced. The full width at half maximum (FWHM), coefficient of variation (COV), and contrast were computed and compared with that of using the Monte Carlo (MC)-based and multiray methods. In this paper, the dual-head PET system is configured with a 5 cm separation and 52 \times 104 mm3 detection area of each head. The size of each crystal is 13\times 1.89\times 1.89 mm3. The results indicate that the rods with 1.0 mm diameter are resolved basically with the 100th iteration when the voxel is virtually divided into 2\times 2\times 2 and 4\times 4\times 4 subvoxels, which is comparable to that with the MC-based SRM. When the voxel is divided into four cuboid-shaped subvoxels, the rods with 1.0 mm diameter are resolved with the 80th iteration and the COV performs well in the simulation experiment. Overall, the proposed SRM model achieves a good compromise between image quality and calculation time.
Published in: IEEE Transactions on Radiation and Plasma Medical Sciences ( Volume: 4, Issue: 1, January 2020)
Page(s): 81 - 90
Date of Publication: 04 July 2019

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