3T-MR装置におけるSAR低減シーケンスの画像特性
Reduction of the specific absorption ratio (SAR) is essential in MR systems with high magnetic fields. Therefore, a variety of SAR-reduced sequences are available on modern 3T-MR systems, and some sequences can be applied under the same conditions as conventional sequences. The purpose of this study...
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| Published in | 日本放射線技術学会雑誌 Vol. 64; no. 12; pp. 1492 - 1496 |
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| Main Authors | , , , , , |
| Format | Journal Article |
| Language | Japanese |
| Published |
公益社団法人 日本放射線技術学会
2008
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| Subjects | |
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| Abstract | Reduction of the specific absorption ratio (SAR) is essential in MR systems with high magnetic fields. Therefore, a variety of SAR-reduced sequences are available on modern 3T-MR systems, and some sequences can be applied under the same conditions as conventional sequences. The purpose of this study was to compare the imaging properties of a phantom acquired by SAR-reduced sequences with those of conventional sequences. Our data showed that effective relaxation time differed in each of the sequences, because the echo space and RF pulse of the SAR-reduced sequences varied from those of the conventional sequences. Further, the image contrast of the SAR-reduced sequences differed from the image contrast of the conventional ones. |
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| AbstractList | Reduction of the specific absorption ratio (SAR) is essential in MR systems with high magnetic fields. Therefore, a variety of SAR-reduced sequences are available on modern 3T-MR systems, and some sequences can be applied under the same conditions as conventional sequences. The purpose of this study was to compare the imaging properties of a phantom acquired by SAR-reduced sequences with those of conventional sequences. Our data showed that effective relaxation time differed in each of the sequences, because the echo space and RF pulse of the SAR-reduced sequences varied from those of the conventional sequences. Further, the image contrast of the SAR-reduced sequences differed from the image contrast of the conventional ones. |
| Author | 松村, 暁彦 北垣, 一 尾崎, 史郎 内田, 幸司 原, 真司 小松, 明夫 |
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| Copyright | 2008 公益社団法人 日本放射線技術学会 |
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| DOI | 10.6009/jjrt.64.1492 |
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| References | 8）小倉明夫，石黒秋弘，木村哲哉，他．高速SE撮像における撮像パラメータとj-couplingとMT-effectの相対的関係．日放技学誌 2001；57（8）：933-938 1) Nayak KS, Hu BS. Triggered real-time MRI and cardiac applications. Magn Reson Med 2003; 49 (1) : 188-192. 6）日本工業規格．磁気共鳴画像診断装置–安全 JIS Z 4951，2004 10) http://rsb.info.nih.gov/ij/plugins/mri-analysis.html 12）紀ノ定保臣，松島 秀，久保 均，他．交差緩和の原理と応用 Fast spin echo法の定量性に関する基礎的検討 Magnetization transfer効果がもたらす画像の複雑さ．日獨医報 1997；42（1）：7-18 5) Hargreaves BA, Cunningham CH, Nishimura DG, et al. Variable-rate selective excitation for rapid MRI sequences. Magn Reson Med 2004; 52 (3) : 590-597. 9）蘭 悠久，中溝幸夫．盲点補完に及ぼす線分刺激と背景間の色差および輝度差の効果．VISION 2006；18（1）：1-10 4) Ro YM, Cho ZH. A new frontier of blood imaging using susceptibility effect and tailored RF pulses. Magn Reson Med 1992; 28 (2) : 237-248. 11）金澤裕樹，宮地利明，井上雄介，他．高速スピンエコー法を用いた造影ダイナミックT1値計測MRIの最適条件の検討．日放技学誌 2007；63（10）：1127-1132 2) Zhu Y. Parallel excitation with an array of transmit coils. Magn Reson Med 2004; 51 (4) : 775-784. 3) Lin C, Bernstein MA, Gibbs GF, et al. Reduction of RF power for magnetization transfer with optimized application of RF pulses in k-space. Magn Reson Med 2003; 50 (1) : 114-121. 7）日本放射線技術学会 編，放射線撮影分科会．放射線医療技術学叢書（18）MR撮像技術 よりよい画像を得るために．京都：日本放射線技術学会出版委員会，2000 |
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| Title | 3T-MR装置におけるSAR低減シーケンスの画像特性 |
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