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

doi:10.3938/jkps.74.318

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

School of Biomedical Engineering

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

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 language	English
Pages (from-to)	318-323
Number of pages	6
Journal	Journal of the Korean Physical Society
Volume	74
Issue number	3
DOIs	https://doi.org/10.3938/jkps.74.318
Publication status	Published - 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.

Keywords

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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10.3938/jkps.74.318

Cite this

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title = "Geometric Sensitivity of Variable Pinhole SPECT with a Keel-edge Pinhole Model",

abstract = "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.",

keywords = "Image reconstruction, Pinhole SPECT, Sensitivity modeling, Single photon emission computed tomography, Variable pinhole",

author = "Hyemi Cha and Jung, {Young Jun} and Kisung Lee and Hakjae Lee and Seungbin Bae and Jaekeon Bae",

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: {\textcopyright} 2019, The Korean Physical Society.",

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doi = "10.3938/jkps.74.318",

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AU - Lee, Hakjae

AU - Bae, Seungbin

AU - Bae, Jaekeon

N1 - 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.

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N2 - 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.

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

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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