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MRI compatibility study of a prototype radiofrequency penetrable oval PET insert at 3 T
https://repo.qst.go.jp/records/2000962
https://repo.qst.go.jp/records/2000962803918b4-f0ae-4f12-8066-9ad4e86b2090
| アイテムタイプ | 学術雑誌論文 / Journal Article(1) | |||||||||||||||||
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| 公開日 | 2025-07-14 | |||||||||||||||||
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| タイトル | MRI compatibility study of a prototype radiofrequency penetrable oval PET insert at 3 T | |||||||||||||||||
| 言語 | en | |||||||||||||||||
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| 言語 | eng | |||||||||||||||||
| 資源タイプ | ||||||||||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||||||||||||
| 資源タイプ | journal article | |||||||||||||||||
| 著者 |
Akram Hossain
× Akram Hossain
× Nishikido Fumihiko
× Craig S. Levin
× Takyu Sodai
× Obata Takayuki
× Yamaya Taiga
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| 抄録 | ||||||||||||||||||
| 内容記述タイプ | Abstract | |||||||||||||||||
| 内容記述 | Purpose: To perform an MRI compatibility study of an RF field penetrable oval shaped PET insert that implements an MRI built-in body RF coil both as a transmitter and a receiver. Methods: Twelve electrically floating RF shielded PET detector modules were used to construct the prototype oval PET insert with a major axis of 440 mm, a minor axis of 350 mm and an axial length of 225 mm. The electric floating of the PET detector modules was accomplished by isolating the cable shield from the detector shield using plastic tape. Studies were conducted on the transmit (B1) RF field, the image signal to noise ratio (SNR), and the RF pulse amplitude for a homogeneous cylindrical (diameter: 160 mm and length: 260 mm) phantom (NaCl+NiSO4 solution)) in a 3 T clinical MRI system (Verio, Siemens, Erlangen, Germany). Results: The B1 maps for the oval insert were similar to the MRI only field responses. Compared to the MRI only values, SNR reductions of 51%, 45% and 59% were seen respectively for the spin echo (SE), gradient echo (GE) and echo planar (EPI) images for the case of oval PET insert. Moreover, the required RF pulse amplitudes for the SE, GE and EPI sequences were respectively 1.93, 1.85 and 1.36 times larger. However, a 30% reduction in the average RF reception sensitivity was observed for the oval insert. Conclusions: The prototype floating PET insert was a safety concern for the clinical MRI system, and this compatibility study provided clearance for developing a large body size floating PET insert for the existing MRI system. Because of the RF shield of the insert, relatively large RF powers compared to the MRI-only case were required. Because of this and also due to low RF sensitivity of the body coil, the SNRs reduced largely. |
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| 書誌情報 |
Japanese Journal of Radiology 巻 42, p. 382-390, 発行日 2023-12 |
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| 出版者 | Springer Nature | |||||||||||||||||
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| 収録物識別子タイプ | ISSN | |||||||||||||||||
| 収録物識別子 | 1867-108X | |||||||||||||||||
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| 識別子タイプ | DOI | |||||||||||||||||
| 関連識別子 | 10.1007/s11604-023-01514-y. | |||||||||||||||||
