Multiple-echo steady-state (MESS): Extending DESS for joint T₂ mapping and chemical-shift corrected water-fat separation.

ABSTRACT:

Purpose

To extend the double echo steady-state (DESS) sequence to enable chemical-shift corrected water-fat separation.

Methods

This study proposes multiple-echo steady-state (MESS), a sequence that modifies the readouts of the DESS sequence to acquire two echoes each with bipolar readout gradients with higher readout bandwidth. This enables water-fat separation and eliminates the need for water-selective excitation that is often used in combination with DESS, without increasing scan time. An iterative fitting approach was used to perform joint chemical-shift corrected water-fat separation and T₂ estimation on all four MESS echoes simultaneously. MESS and water-selective DESS images were acquired for five volunteers, and were compared qualitatively as well as quan

SUBMITTER: Zijlstra F 

PROVIDER: S-EPMC8596862 | biostudies-literature | 2021 Dec

REPOSITORIES: biostudies-literature