Abstract #0857

Improvements in in vivo imaging and temperature mapping using passive “propeller-beanie” antenna in transcranial MR-guided focused ultrasound

Xinqiang Yan^1,2, Steven P. Allen³, Craig H. Meyer³, and William A. Grissom^1,2,4

¹Vanderbilt University Institute of Imaging Science, Nashville, TN, United States, ²Department of Radiology and Radiological Sciences, Vanderbilt University Medical Center, Nashville, TN, United States, ³Department of Biomedical Engineering, University of Virginia, Charlottesville, VA, United States, ⁴Department of Biomedical Engineering, Vanderbilt University, Nashville, TN, United States

Transcranial MR-guided focused ultrasound (tcMRgFUS) neurosurgery is a non-invasive treatment for essential tremor and many emerging applications. In FDA-approved Insightec tcMRgFUS system, however, RF reflections create curved dark bands in brain images. In this work, we reported the first B₁⁺ and temperature maps in a healthy volunteer with passive crossed wires to alleviate B₁⁺ dark bands and inhomogeneity in a tcMRgFUS system. Consistent with simulation results and previous experimental results in phantoms, the “propeller-beanie” antenna can significantly alleviate dark band artifacts in Insightec tcMRgFUS system, which improves temperature precision and may enable the use of diffusion imaging to monitor treatment.

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