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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Bibliographic Details
Published in日本放射線技術学会雑誌 Vol. 64; no. 12; pp. 1492 - 1496
Main Authors 内田, 幸司, 尾崎, 史郎, 原, 真司, 松村, 暁彦, 小松, 明夫, 北垣, 一
Format Journal Article
LanguageJapanese
Published 公益社団法人 日本放射線技術学会 2008
Subjects
3T-MR
MR safety
phantom study
relaxation time
SAR
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Summary: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.
ISSN:0369-4305
1881-4883
DOI:10.6009/jjrt.64.1492