Mitsuharu Miyoshi1, Naoyoki Takei1,
Masaaki Akahane2, Yasushi Watanabe3, Tetsuji Tsukamoto1
1Japan Applied Science Laboratory, GE
Healthcare Japan, Hino, Tokyo, Japan; 2Radiology, University of
Tokyo, Tokyo, Japan; 3Radiological Technology, University of Tokyo
Hospital, Tokyo, Japan
T2-prep
is important for cardiovascular applications. However, because of B1
inhomogeneity on 3T, inhomogeneous signal loss occurs. T2-prep often uses
MLEV-4 type sequence. In this study, B1 insensitive MLEV-4 type preparation
pulse was designed and B1 and flow sensitivity were measured. Flip angle of
MLEV-4 sequence was modified to (90x,140y,-200y,-140y,200y,-90x). Because at
least two of the refocus pulses became near to 180 degree between -20% and
+40% of delta B1, magnetizations were refocused correctly and became
insensitive to B1 inhomogeneity. This preparation pulse suppressed flow
signal and can also be used as flow saturation preparation pulse.