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Abstract #4442

Accuracy of T1 and Equilibrium Magnetization Maps Using a Spoiled Gradient-Recalled Echo Sequence with Variable Flip Angles at 4.7 T, 7 T, and 9.4 T: A Gadolinium-Doped Gel Phantom Study.

Hideto Kuribayashi1, Takuya Minowa2, Yoshie Maitani2, Masaki Sekino3, Hiroyuki Ohsaki3, Masayuki Ueda4, Yasuo Katayama4

1Varian Inc., Minato-ku, Tokyo, Japan; 2Hoshi University, Shinagawa-ku, Tokyo, Japan; 3The University of Tokyo, Kashiwa, Chiba, Japan; 4Nippon Medical School, Bunkyo-ku, Tokyo, Japan


T1 calculated using a spoiled gradient-recalled echo sequence with variable flip angles (SPGR-VFA) was underestimated especially at 9.4 T and with a short TR (< 10 ms). T2* wasn't found to be the main reason of the shortened T1 from the SPGR-VFA method at 9.4 T. Variable TR measurements were found to be useful for more accurate T1map measurement. Magnetization equilibrium maps using the SPGR-VFA method were interestingly stable among the variable TRs.