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.