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A Hands-Free MR-Compatible Volumetric Ultrasound Probe for Real-Time Motion Management During External Beam Radiotherapy

B Bednarz

B Bednarz1*, W Lee2 , D Mills2 , D Shoudy2 , H Chan2 , J Sabatini2 , E Fiveland2 , B Wang2 , J Mitra2 , R Darrow2 , W Culberson1 , A Shepard1 , C Matrosic1 , A McMillan1 , J Holmes1 , J Zagzebski1 , S Smith2 , T Foo2 , (1) University of Wisconsin, Madison, WI, (2) GE Global Research Center, Niskayuna, NY


MO-DE-708-4 (Monday, July 31, 2017) 1:45 PM - 3:45 PM Room: 708

Purpose: To introduce the first-ever hands-free, MR-compatible volumetric (e4D) ultrasound probe that will be used for real-time motion management during external beam radiotherapy.

Methods: The e4D ultrasound probe prototype consisting of 18,000 acoustic elements was developed and tested in a 3T MRI scanner (GE MR750) to investigate interactions between the ultrasound (GE Vivid VE9) and MR systems. The ultrasound probe and control cable were designed to withstand the presence of RF noise inside of the MR scan room by the removal of metallic components from the beam forming and data acquisition electronics in the probe and extending RF shielding from probe housing to the US console by a custom-made cable.

Results: Initial testing of the probe confirmed that shielding of the ultrasound probe housing and control cable successfully minimized system-to-system interactions between the ultrasound and MR system. Furthermore the resulting MR and ultrasound images were relatively artifact-free.

Conclusion: This work demonstrates progress towards a truly functional e4D imaging system that is able to acquire simultaneous MR and ultrasound images. Coupled with rapid feature identification and tracking algorithms, real-time tumor motion tracking utilizing ultrasound and MR images can be realized.

Funding Support, Disclosures, and Conflict of Interest: This work was partially funded by NIH grant R01CA190298 and GE Global Research Center.

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