Reducing temperature errors in transcranial MR-guided focused ultrasound using a reduced-field-of-view sequence.

ABSTRACT:

Purpose

To reduce temperature errors due to water motion in transcranial MR-guided focused ultrasound (tcMRgFUS) ablation.

Theory and methods

In tcMRgFUS, water is circulated in the transducer bowl around the patient's head for acoustic coupling and heat removal. The water moves during sonications that are monitored by MR thermometry, which causes it to alias into the brain and create temperature errors. To reduce these errors, a two-dimensional excitation pulse was implemented in a gradient-recalled echo thermometry sequence. The pulse suppresses water signal by selectively exciting the brain only, which reduces the imaging FOV. Improvements in temperature precision compared to the conventional full-FOV scan were evaluated in healthy subject scans outside the tcMRgFUS syste

SUBMITTER: Grissom WA 

PROVIDER: S-EPMC6903412 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature