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Mizuta T, Kobayashi T, Yamakawa Y, Hanaoka K, Watanabe S, Morimoto-Ishikawa D, Yamada T, Kaida H, Ishii K. Initial evaluation of a new maximum-likelihood attenuation correction factor-based attenuation correction for time-of-flight brain PET. Ann Nucl Med 2022; 36:420-426. [PMID: 35138565 DOI: 10.1007/s12149-022-01721-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Accepted: 01/17/2022] [Indexed: 11/01/2022]
Abstract
AIM The aim of this study was to evaluate an image reconstruction algorithm, including a new maximum-likelihood attenuation correction factor (ML-ACF) for time of flight (TOF) brain positron emission tomography (PET). METHODS The implemented algorithm combines an ML-ACF method that simultaneously estimates both the emission image and attenuation sinogram from TOF emission data, and a scaling method based on anatomical features. To evaluate the algorithm's quantitative accuracy, three-dimensional brain phantom images were acquired and soft-tissue attenuation coefficients and emission values were analyzed. RESULTS The heterogeneous distributions of attenuation coefficients in soft tissue, skull, and nasal cavity were sufficiently visualized. The attenuation coefficient of soft tissue remained within 5% of theoretical value. Attenuation-corrected emission showed no lateral differences, and significant differences among soft tissue were within the error range. CONCLUSION The ML-ACF-based attenuation correction implemented for TOF brain PET worked well and obtained practical levels of accuracy.
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Affiliation(s)
- Tetsuro Mizuta
- Medical Systems Division, Shimadzu Corporation, 1, Nishinokyo Kuwabara-cho, Nakagyo-ku, Kyoto, 604-8511, Japan.
| | | | - Yoshiyuki Yamakawa
- Medical Systems Division, Shimadzu Corporation, 1, Nishinokyo Kuwabara-cho, Nakagyo-ku, Kyoto, 604-8511, Japan
| | - Kohei Hanaoka
- Division of Positron Emission Tomography, Institute of Advanced Clinical Medicine, Kindai University, Osakasayama, Japan
| | - Shota Watanabe
- Division of Positron Emission Tomography, Institute of Advanced Clinical Medicine, Kindai University, Osakasayama, Japan
| | - Daisuke Morimoto-Ishikawa
- Division of Positron Emission Tomography, Institute of Advanced Clinical Medicine, Kindai University, Osakasayama, Japan
| | - Takahiro Yamada
- Division of Positron Emission Tomography, Institute of Advanced Clinical Medicine, Kindai University, Osakasayama, Japan
| | - Hayato Kaida
- Division of Positron Emission Tomography, Institute of Advanced Clinical Medicine, Kindai University, Osakasayama, Japan.,Department of Radiology, Kindai University Faculty of Medicine, Osakasayama, Japan
| | - Kazunari Ishii
- Division of Positron Emission Tomography, Institute of Advanced Clinical Medicine, Kindai University, Osakasayama, Japan.,Department of Radiology, Kindai University Faculty of Medicine, Osakasayama, Japan
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