Tokunori Kimura1, Shinichi Kitane2,
Kazuhiro Sueoka3
1MRI Systems Development Department,
Toshiba Medical Systems , Otawara, Tochigi, Japan; 2MRI Systems
Development Department, Toshiba Medical
Enginieering, Otawara, Tochigi, Japan; 3MRI Systems
Development Department, Toshiba Medical Enginieering, Otawara, Tochigi, Japan
In-flow
time-resolved MR angiography technique employing non-subtraction arterial
spin labeling with multiple IR (mIR) technique was proposed. It was, however,
difficult for mIR to suppress background tissue of wide range of T1 values
from fat to CSF. We proposed alternative N-1 subtraction technique further to
suppress background tissue signals while minimizing extra acquisition time.
Volunteer brain study was performed on 1.5T imager with 2 mIR pulses designed
to suppress brain tissues. Resulting background signals of fat and brain
parenchyma were well suppressed only by adding extra acquisition time of 16
sec for base image then subtraction.