Mitigating banding artifacts in balanced steady-state free precession using parallel transmission in a single acquisition.

ABSTRACT:

Purpose

Using parallel transmission (pTx) in ultra-high field MRI allows efficient radiofrequency pulse designs that can produce uniform excitations. Here, we demonstrate that pTx can simultaneously mitigate B1+$$ {\mathrm{B}}_1^{+} $$ non-uniformity and off-resonance artifacts in balanced steady-state free precession sequences at 7 T.

Theory and methods

The standard hard excitation pulses of the balanced steady-state free precession sequence were replaced with two pTx pulses, played out in alternating repetition times. Based on the k_T-point trajectory, each pulse was designed to produce spatially varying phase distributions that compensate for off-resonance phase variations accumulated over one repetition time duration, while also mitigating B1+$$ {\mathrm{B}}_1^

SUBMITTER: Wu CY 

PROVIDER: S-EPMC12681311 | biostudies-literature | 2026 Feb

REPOSITORIES: biostudies-literature