Abstract #3611

Phase artifact correction for improved ARFI displacement mapping using a short FID navigator

Tetiana Dadakova¹, Ali Caglar Özen¹, Axel Joachim Krafft^1,2,3, Jan Gerrit Korvink⁴, and Michael Bock¹

¹Dept. of Radiology - Medical Physics, University Medical Center Freiburg, Freiburg, Germany, ²German Cancer Consortium (DKTK), Heidelberg, Germany, ³German Cancer Research Center (DKFZ), Heidelberg, Germany, ⁴Institute of Microstructure Technology, Karlsruhe Institute of Technology, Karlsruhe, Germany

MR-guided acoustic radiation force imaging (ARFI) is used for the focal spot localization during high intensity focused ultrasound (HIFU) therapies. The acoustic radiation force related tissue displacement is measured with help of motion encoding gradients (MEG). While MEGs are sensitive enough to detect micrometer-scale displacement, the images acquired using MR-ARFI pulse sequences are often corrupted with artifacts. The method described uses very short FID navigator readout for correction of ARFI images without any manual interaction. ARFI displacement maps corrected by FID navigator have substantially less artifacts, 2.5 times higher SNR, and clearly visible HIFU focal spot.

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