Improved MRI thermometry with multiple-echo spirals

Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
Michael Marx, Kim Butts Pauly

Abstract

Low-bandwidth PRF shift thermometry is used to guide HIFU ablation treatments. Low sampling bandwidth is needed for high signal-to-noise ratio with short acquisition times, but can lead to off-resonance artifacts. In this work, improved multiple-echo thermometry is presented that allows for high bandwidth and reduced artifacts. It is also demonstrated with spiral sampling, to improve the trade-off between resolution, speed, and measurement precision. Four multiple-echo thermometry sequences were tested in vivo, one using two-dimensional Fourier transform (2DFT) sampling and three using spirals. The spiral sequences were individually optimized for resolution, for speed, and for precision. Multifrequency reconstruction was used to correct for off-resonance spiral artifacts. Additionally, two different multiecho temperature reconstructions were compared. Weighted combination of per-echo phase differences gave significantly better precision than least squares off-resonance estimation. Multiple-echo 2DFT sequence obtained precision similar to single-echo 2DFT, while greatly increasing sampling bandwidth. The multiecho spiral acquisitions achieved 2× better resolution, 2.9× better uncertainty, or 3.4× faster acquisition time, without...Continue Reading

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Citations

Aug 7, 2017·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Sumeeth V Jonathan, William A Grissom
Jun 24, 2017·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Bryant T SvedinDennis L Parker
Jan 16, 2019·Lasers in Surgery and Medicine·Henrik Odéen, Dennis L Parker
Jun 27, 2020·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Shenyan ZongBruno Madore
Oct 5, 2016·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Michael MarxKim Butts Pauly
Nov 21, 2020·Journal of Magnetic Resonance Imaging : JMRI·James BlackwellNiall Colgan
Feb 26, 2019·Progress in Nuclear Magnetic Resonance Spectroscopy·Henrik Odéen, Dennis L Parker

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