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.