Accuracy and precision of electrical permittivity mapping at 3T: the impact of three B1+ mapping techniques.

ABSTRACT:

Purpose

To investigate the sequence-specific impact of B1+ amplitude mapping on the accuracy and precision of permittivity reconstruction at 3T in the pelvic region.

Methods

B1+ maps obtained with actual flip angle imaging (AFI), Bloch-Siegert (BS), and dual refocusing echo acquisition mode (DREAM) sequences, set to a clinically feasible scan time of 5 minutes, were compared in terms of accuracy and precision with electromagnetic and Bloch simulations and MR measurements. Permittivity maps were reconstructed based on these B1+ maps with Helmholtz-based electrical properties tomography. Accuracy and precision in permittivity were assessed. A 2-compartment phantom with properties and size similar to the human pelvis was used for both simulations and measurements. Measurements

SUBMITTER: Gavazzi S 

PROVIDER: S-EPMC6593818 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature