MR fingerprinting with simultaneous B1 estimation.

ABSTRACT:

Purpose

MR fingerprinting (MRF) can be used for quantitative estimation of physical parameters in MRI. Here, we extend the method to incorporate B1 estimation.

Methods

The acquisition is based on steady state free precession MR fingerprinting with a Cartesian trajectory. To increase the sensitivity to the B1 profile, abrupt changes in flip angle were introduced in the sequence. Slice profile and B1 effects were included in the dictionary and the results from two- and three-dimensional (3D) acquisitions were compared. Acceleration was demonstrated using retrospective undersampling in the phase encode directions of 3D data exploiting redundancy between MRF frames at the edges of k-space.

Results

Without B1 estimation, T2 and B1 were inaccurate by more than 20%. Abrupt c

SUBMITTER: Buonincontri G 

PROVIDER: S-EPMC5061105 | biostudies-literature | 2016 Oct

REPOSITORIES: biostudies-literature