Gradient-Modulated PETRA MRI.

ABSTRACT: Image blurring due to off-resonance and fast T ₂^* signal decay is a common issue in radial ultrashort echo time MRI sequences. One solution is to use a higher readout bandwidth, but this may be impractical for some techniques like pointwise encoding time reduction with radial acquisition (PETRA), which is a hybrid method of zero echo time and single point imaging techniques. Specifically, PETRA has severe specific absorption rate (SAR) and radiofrequency (RF) pulse peak power limitations when using higher bandwidths in human measurements. In this study, we introduce gradient modulation (GM) to PETRA to reduce image blurring artifacts while keeping SAR and RF peak power low. Tolerance of GM-PETRA to image blurring was evaluated in simulations and experiments by

SUBMITTER: Kobayashi N 

PROVIDER: S-EPMC4709465 | biostudies-literature | 2015 Dec

REPOSITORIES: biostudies-literature