Phase relaxed localized excitation pulses for inner volume fast spin echo imaging.

ABSTRACT:

Purpose

To design multidimensional spatially selective radiofrequency (RF) pulses for inner volume imaging (IVI) with three-dimensional (3D) fast spin echo (FSE) sequences. Enhanced background suppression is achieved by exploiting particular signal properties of FSE sequences.

Theory and methods

The CPMG condition dictates that echo amplitudes will rapidly decrease if a 90° phase difference between excitation and refocusing pulses is not present, and refocusing flip angles are not precisely 180°. This mechanism is proposed as a means for generating additional background suppression for spatially selective excitation, by biasing residual excitation errors toward violating the CPMG condition. 3D RF pulses were designed using this method with a 3D spherical spiral trajectory, u

SUBMITTER: Malik SJ 

PROVIDER: S-EPMC4988531 | biostudies-literature | 2016 Sep

REPOSITORIES: biostudies-literature