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Akamatsu G, Tashima H, Yoshida E, Iwao Y, Takyu S, Wakizaka H, Takahashi M, Yamaya T. [[PET] 3. The World's First Hemispherical Brain PET System: VRAIN]. Nihon Hoshasen Gijutsu Gakkai Zasshi 2023; 79:200-205. [PMID: 36804812 DOI: 10.6009/jjrt.2023-2161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Affiliation(s)
- Go Akamatsu
- National Institutes for Quantum Science and Technology (QST)
| | - Hideaki Tashima
- National Institutes for Quantum Science and Technology (QST)
| | - Eiji Yoshida
- National Institutes for Quantum Science and Technology (QST)
| | - Yuma Iwao
- National Institutes for Quantum Science and Technology (QST)
| | - Sodai Takyu
- National Institutes for Quantum Science and Technology (QST)
| | | | | | - Taiga Yamaya
- National Institutes for Quantum Science and Technology (QST)
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Akamatsu G, Takahashi M, Tashima H, Iwao Y, Yoshida E, Wakizaka H, Kumagai M, Yamashita T, Yamaya T. Performance evaluation of VRAIN: a brain-dedicated PET with a hemispherical detector arrangement. Phys Med Biol 2022; 67. [PMID: 36317319 DOI: 10.1088/1361-6560/ac9e87] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Accepted: 10/28/2022] [Indexed: 11/07/2022]
Abstract
Objective.For PET imaging systems, a smaller detector ring enables less intrinsic spatial resolution loss due to the photon non-collinearity effect as well as better balance between production cost and sensitivity, and a hemispherical detector arrangement is more appropriate for brain imaging than a conventional cylindrical arrangement. Therefore, we have developed a brain-dedicated PET system with a hemispherical detector arrangement, which has been commercialized in Japan under the product name of VRAINTM. In this study, we evaluated imaging performance of VRAIN.Approach.The VRAIN used 54 detectors to form the main hemispherical unit and an additional half-ring behind the neck. Each detector was composed of a 12 × 12 array of lutetium fine silicate crystals (4.1 × 4.1 × 10 mm3) and a 12 × 12 array of silicon photomultipliers (4 × 4 mm2active area) with the one-to-one coupling. We evaluated the physical performance of VRAIN according to the NEMA NU 2-2018 standards. Some measurements were modified so as to fit the hemispherical geometry. In addition, we performed18F-FDG imaging in a healthy volunteer.Main results.In the phantom study, the VRAIN showed high resolution for separating 2.2 mm rods, 229 ps TOF resolution and 19% scatter fraction. With the TOF gain for a 20 cm diameter object (an assumed head diameter), the peak noise-equivalent count rate was 144 kcps at 9.8 kBq ml-1and the sensitivity was 25 kcps MBq-1. Overall, the VRAIN provided excellent image quality in phantom and human studies. In the human FDG images, small brain nuclei and gray matter structures were clearly visualized with high contrast and low noise.Significance.We demonstrated the excellent imaging performance of VRAIN, which supported the advantages of the hemispherical detector arrangement.
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Affiliation(s)
- Go Akamatsu
- Department of Advanced Nuclear Medicine Sciences, Institute for Quantum Medical Sciences, National Institutes for Quantum Science and Technology (QST), Chiba, Japan
| | - Miwako Takahashi
- Department of Advanced Nuclear Medicine Sciences, Institute for Quantum Medical Sciences, National Institutes for Quantum Science and Technology (QST), Chiba, Japan
| | - Hideaki Tashima
- Department of Advanced Nuclear Medicine Sciences, Institute for Quantum Medical Sciences, National Institutes for Quantum Science and Technology (QST), Chiba, Japan
| | - Yuma Iwao
- Department of Advanced Nuclear Medicine Sciences, Institute for Quantum Medical Sciences, National Institutes for Quantum Science and Technology (QST), Chiba, Japan
| | - Eiji Yoshida
- Department of Advanced Nuclear Medicine Sciences, Institute for Quantum Medical Sciences, National Institutes for Quantum Science and Technology (QST), Chiba, Japan
| | - Hidekatsu Wakizaka
- Department of Advanced Nuclear Medicine Sciences, Institute for Quantum Medical Sciences, National Institutes for Quantum Science and Technology (QST), Chiba, Japan
| | | | | | - Taiga Yamaya
- Department of Advanced Nuclear Medicine Sciences, Institute for Quantum Medical Sciences, National Institutes for Quantum Science and Technology (QST), Chiba, Japan
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Akamatsu G, Ikari Y. [[Nuclear Medicine] 2. Brain Phantoms for Nuclear Medicine Imaging]. Nihon Hoshasen Gijutsu Gakkai Zasshi 2022; 78:383-388. [PMID: 35444092 DOI: 10.6009/jjrt.2022-2005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Go Akamatsu
- National Institutes for Quantum Science and Technology (QST)
| | - Yasuhiko Ikari
- Division of Molecular Imaging, Institute of Biomedical Research and Innovation
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Yoshida E, Tashima H, Akamatsu G, Iwao Y, Takahashi M, Yamashita T, Yamaya T. 245 ps-TOF brain-dedicated PET prototype with a hemispherical detector arrangement. ACTA ACUST UNITED AC 2020; 65:145008. [DOI: 10.1088/1361-6560/ab8c91] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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