Reduced field of view imaging using a static second-order gradient for functional MRI applications.

ABSTRACT:

Purpose

Imaging using reduced FOV excitation allows higher resolution or signal-to-noise ratio (SNR) per scan time but often requires long radiofrequency pulses. The goal of this study was to improve a recent reduced field of view (FOV) method that uses a second-order shim gradient to decrease pulse length and evaluate its use in functional MRI (fMRI) applications.

Theory and methods

The method, which was initially limited to excite thin disc-shaped regions at the isocenter, was extended to excite thicker regions off the isocenter and produced accurate excitation profiles on a grid phantom. Visual stimulation fMRI scans were performed with full and reduced FOV. The resolution of the time series images and functional activation maps were assessed using the full-width half-max

SUBMITTER: Islam H 

PROVIDER: S-EPMC4583326 | biostudies-literature | 2016 Feb

REPOSITORIES: biostudies-literature