Fat suppression for ultrashort echo time imaging using a novel soft-hard composite radiofrequency pulse.

ABSTRACT:

Purpose

To design a soft-hard composite pulse for fat suppression and water excitation in ultrashort echo time (UTE) imaging with minimal short T₂ signal attenuation.

Methods

The composite pulse contains a narrow bandwidth soft pulse centered on the fat peak with a small negative flip angle (-α) and a short rectangular pulse with a small positive flip angle (α). The fat magnetization experiences both tipping-down and -back with an identical flip angle and thus returns to the equilibrium state, leaving only the excited water magnetization. Bloch simulations, as well as knee, tibia, and ankle UTE imaging studies, were performed to investigate the effectiveness of fat suppression and corresponding water signal attenuation. A conventional fat saturation (FatSat) modul

SUBMITTER: Ma YJ 

PROVIDER: S-EPMC6717024 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature