医用画像情報学会雑誌 = Medical Imaging and Information Sciences
巻
27
号
4
ページ
111 - 115
発行年
2010-01-01
ISSN
0910-1543
NCID
AN10156808
DOI
10.11318/mii.27.111
出版者
医用画像情報学会 = MII: Japan Society of Medical Imaging and Information Sciences
抄録
The purpose of our study is to develop and to assess a method to calculate T1 and T2 relaxation times using fast spin-echo (FSE) sequences with two echoes per excitation. On a 1.5-T MRI, dual-echo FSE sequences with different repetition times (TR:TR2=2TR1, i.e., TR1=400ms and TR2=800ms) were performed in MnCl2 phantom. Then, we assessed effects of the echo train length (ETL) , effective echo time (TE) , and T2 correction for T1 measurement, when changed each imaging parameter. Besides, we evaluated with comparison between the dual-echo FSE method and mixed sequence. With optimizing FSE imaging parameters, i.e., effective TE, TR, and low ETL, the measurement values of T1 and T2 revealed significantly higher correlation between the dual FSE method and mixed sequence. Moreover, the T2 correction to calculate T1 value could be omitted by shortening first effective TE. The dual-echo FSE method makes it possible to measure T1 and T2 fast and easily and to obtain more detailed information of organizations in human.
高速スピンエコー法を用いたT1・T2同時計測MRI
ME-PR-MITATI-T-111.pdf
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