Fully phase-encoded MRI near metallic implants using ultrashort echo times and broadband excitation.

ABSTRACT:

Purpose

To develop a fully phase-encoded MRI method for distortion-free imaging near metallic implants, in clinically feasible acquisition times.

Theory and methods

An accelerated 3D fully phase-encoded acquisition with broadband excitation and ultrashort echo times is presented, which uses a broadband radiofrequency pulse to excite the entire off-resonance induced by the metallic implant. Furthermore, fully phase-encoded imaging is used to prevent distortions caused by frequency encoding, and to obtain ultrashort echo times for rapidly decaying signal.

Results

Phantom and in vivo acquisitions were used to describe the relationship among excitation bandwidth, signal loss near metallic implants, and T₁ weighting. Shorter radiofrequency pulses captured signal

SUBMITTER: Wiens CN 

PROVIDER: S-EPMC5811328 | biostudies-literature | 2018 Apr

REPOSITORIES: biostudies-literature