Respiratory-gated MRgHIFU in upper abdomen using an MR-compatible in-bore digital camera.

ABSTRACT:

Objective

To demonstrate the technical feasibility and the potential interest of using a digital optical camera inside the MR magnet bore for monitoring the breathing cycle and subsequently gating the PRFS MR thermometry, MR-ARFI measurement, and MRgHIFU sonication in the upper abdomen.

Materials and methods

A digital camera was reengineered to remove its magnetic parts and was further equipped with a 7 m long USB cable. The system was electromagnetically shielded and operated inside the bore of a closed 3T clinical scanner. Suitable triggers were generated based on real-time motion analysis of the images produced by the camera (resolution 640 × 480 pixels, 30 fps). Respiratory-gated MR-ARFI prepared MRgHIFU ablation was performed in the kidney and liver of two sheep in vivo

SUBMITTER: Auboiroux V 

PROVIDER: S-EPMC3925565 | biostudies-literature | 2014

REPOSITORIES: biostudies-literature