Volumetric MRI thermometry using a three-dimensional stack-of-stars echo-planar imaging pulse sequence.

ABSTRACT:

Purpose

To measure temperature over a large brain volume with fine spatiotemporal resolution.

Methods

A three-dimensional stack-of-stars echo-planar imaging sequence combining echo-planar imaging and radial sampling with golden angle spacing was implemented at 3T for proton resonance frequency-shift temperature imaging. The sequence acquires a 188x188x43 image matrix with 1.5x1.5x2.75 mm³ spatial resolution. Temperature maps were reconstructed using sensitivity encoding (SENSE) image reconstruction followed by the image domain hybrid method, and using the k-space hybrid method. In vivo temperature maps were acquired without heating to measure temperature precision in the brain, and in a phantom during high-intensity focused ultrasound sonication.

Results

In

SUBMITTER: Jonathan SV 

PROVIDER: S-EPMC5803468 | biostudies-literature | 2018 Apr

REPOSITORIES: biostudies-literature