Geometric Sensitivity of Variable Pinhole SPECT with a Keel-edge Pinhole Model

Hyemi Cha, Young Jun Jung, Kisung Lee, Hakjae Lee, Seungbin Bae, Jaekeon Bae

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


A variable pinhole (VP) collimator is formed by stacking several tungsten plates with different apertures. The configuration of the VP can be optimized for target region-of-interests at different rotation angles. Hence, both the resolution and sensitivity of the system can be improved. However, it is difficult to analytically implement the exact system model that simulates the step shapes between adjacent layers. In this study, we compared the conventional keel-edge and knife-edge pinhole models with the VP model using simulations. The keel-edge and knife-edge models were evaluated based on various specifications to identify the optimum system model. The simulation results showed that the keel-edge model with 80% channel length (keel-edge 80%) elicits the best performance with a fixed acceptance angle and pinhole plate thickness. The results in this study are expected to be applied to full-scale SPECT with a VP collimator which is currently under development.

Original languageEnglish
Pages (from-to)318-323
Number of pages6
JournalJournal of the Korean Physical Society
Issue number3
Publication statusPublished - 2019 Feb 1

Bibliographical note

Funding Information:
This work was supported by a National Research Foundation of Korea (NRF) Grant funded by the Korean Government (MSIP) (NRF-2016R1A2B2007551), the Korean Institute of Energy Technology Evaluation and Planning (KETEP), and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20161520302180).

Publisher Copyright:
© 2019, The Korean Physical Society.


  • Image reconstruction
  • Pinhole SPECT
  • Sensitivity modeling
  • Single photon emission computed tomography
  • Variable pinhole

ASJC Scopus subject areas

  • General Physics and Astronomy


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