Slice-selective adiabatic magnetization T₂ -preparation (SAMPA) for efficient T₂ -weighted imaging at ultrahigh field strengths.

ABSTRACT:

Purpose

At high field, T₂ -weighted (T₂ w) imaging is limited by transmit field inhomogeneity and increased radiofrequency power deposition. In this work, we introduce SAMPA (Slice-selective Adiabatic Magnetization T₂ PrepAration) and demonstrate its use for efficient brain T₂ w imaging at 7 Tesla (T).

Methods

SAMPA was designed by subsampling an optimized B₁ insensitive rotation (BIR4) waveform with small tip angle linear subpulses. To perform T₂ w imaging, SAMPA was inserted before a fast gradient echo acquisition. The off-resonance behavior, B₁ robustness, and slice selectivity of the novel T₂ preparation module were analyzed using Bloch simulations. The performance of SAMPA for T

SUBMITTER: Dyvorne H 

PROVIDER: S-EPMC4887419 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature