Distortion-free magnetic resonance imaging near metallic implants

摘要

A method for 3D magnetic resonance imaging (MRI) with slice-direction distortion correction is provided. One or more selective cross-sections with a thickness along a first axis are excited using a RF pulse with a bandwidth, wherein a selective cross-section is either a selective slice or selective slab. A refocusing pulse is applied to form a spin echo. One or more 2D encoded image signals are acquired with readout along a second axis and phase encoding along a third axis, wherein the data long the phase encoded first and third axes is acquired with an under sampling scheme. Slice-direction distortion is corrected by resolving the position by using phase encoding.

主权项

1. A method for 3D magnetic resonance imaging (MRI) with slice-direction distortion correction in an MRI system comprising a magnet system and a controller, comprising:
a) exciting by the magnet system one or more selective cross-sections with a thickness along a first axis using a RF pulse with a bandwidth, wherein a selective cross-section is either a selective slice or selective slab; b) applying by the magnet system a refocusing pulse to form a spin echo; c) acquiring by the magnet system one or more 2D encoded image signals with readout along a second axis and phase encoding along a third axis, wherein data along the phase encoded first and third axes is acquired with reduced sampling; d) imaging by the controller a phase encoded volume by resolving a selective slice or selective slab position of the one or more selective cross-sections by using phase encoding; and e) suppressing by the controller the signal outside an image region along the phase encoded slice or slab in the first and third axes.