Radiofrequency phase encoded half-pulses in simultaneous multislice ultrashort echo time imaging.

ABSTRACT:

Purpose

To describe a simultaneous multislice (SMS) ultrashort echo time (UTE) imaging method using radiofrequency phase encoded half-pulses in combination with power independent of number of slices (PINS) inversion recovery (IR) pulses to generate multiple-slice images with short T₂ * contrasts in less than 3 min with close to an eightfold acceleration compared with a standard 2D approach.

Theory and methods

Radiofrequency phase encoding is applied in an SMS (N_SMS = 4) excitation scheme using "sinc" half-pulses. With the use of coil sensitivity encoding (SENSE) and controlled aliasing in parallel imaging (CAIPI) in combination with a gradient echo 2D spiral readout trajectory and IR PINS pulses for contrast enhancement a fast UTE sequence is developed.

SUBMITTER: Rettenmeier C 

PROVIDER: S-EPMC6435423 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature