What question did this study set out to answer?

To evaluate the effectiveness of OSEM reconstruction for I-123 FP-CIT SPECT imaging using a ring-type scanner.

Evaluation of Optimal Ordered Subset Expectation Maximization Reconstruction for I-123FP-CIT Single-Photon Emission Computed Tomography Using a Ring-Type Semiconductor Scanner

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Evaluation reveals optimal reconstruction conditions enhance image quality in SPECT using a novel scanner.

To evaluate the effectiveness of OSEM reconstruction for I-123 FP-CIT SPECT imaging using a ring-type scanner.
Utilized a striatum phantom filled with I-123 solution for imaging experiments.
Tested acquisition times of 15, 20, 30, and 120 minutes under various conditions.
Reconstructed images using OSEM with varying numbers of updates and Butterworth filters.
Compared image quality metrics such as %CV and NMSE between ring-type and conventional scanners.
The %CV for the 120 min acquisition was significantly lower when updates reached 100.
The NMSE for 20 and 30 min images plateaued after 120 updates.
Striatal uptake ratio and contrast ratio were notably superior in the ring-type scanner compared to the Anger-type scanner.
Optimal conditions were determined to be 20 min acquisition, 120 OSEM updates, and Butterworth filter cut-offs of 0.4-0.5 cycles/cm.

Yamaguchi et al. (2026) studied this question.

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View Full Paper

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Authors

Evaluation reveals optimal reconstruction conditions enhance image quality in SPECT using a novel scanner.

To evaluate the effectiveness of OSEM reconstruction for I-123 FP-CIT SPECT imaging using a ring-type scanner.
Utilized a striatum phantom filled with I-123 solution for imaging experiments.
Tested acquisition times of 15, 20, 30, and 120 minutes under various conditions.
Reconstructed images using OSEM with varying numbers of updates and Butterworth filters.
Compared image quality metrics such as %CV and NMSE between ring-type and conventional scanners.
The %CV for the 120 min acquisition was significantly lower when updates reached 100.
The NMSE for 20 and 30 min images plateaued after 120 updates.
Striatal uptake ratio and contrast ratio were notably superior in the ring-type scanner compared to the Anger-type scanner.
Optimal conditions were determined to be 20 min acquisition, 120 OSEM updates, and Butterworth filter cut-offs of 0.4-0.5 cycles/cm.

Yamaguchi et al. (2026) studied this question.

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