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Noninvasive temperature mapping with MRI using chemical shift water-fat separation.

Publication ,  Journal Article
Soher, BJ; Wyatt, C; Reeder, SB; MacFall, JR
Published in: Magn Reson Med
May 2010

Tissues containing both water and lipids, e.g., breast, confound standard MR proton reference frequency-shift methods for mapping temperatures due to the lack of temperature-induced frequency shift in lipid protons. Generalized Dixon chemical shift-based water-fat separation methods, such as GE's iterative decomposition of water and fat with echo asymmetry and least-squares estimation method, can result in complex water and fat images. Once separated, the phase change over time of the water signal can be used to map temperature. Phase change of the lipid signal can be used to correct for non-temperature-dependent phase changes, such as amplitude of static field drift. In this work, an image acquisition and postprocessing method, called water and fat thermal MRI, is demonstrated in phantoms containing 30:70, 50:50, and 70:30 water-to-fat by volume. Noninvasive heating was applied in an Off1-On-Off2 pattern over 50 min, using a miniannular phased radiofrequency array. Temperature changes were referenced to the first image acquisition. Four fiber optic temperature probes were placed inside the phantoms for temperature comparison. Region of interest (ROI) temperature values colocated with the probes showed excellent agreement (global mean +/- standard deviation: -0.09 +/- 0.34 degrees C) despite significant amplitude of static field drift during the experiments.

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Published In

Magn Reson Med

DOI

EISSN

1522-2594

Publication Date

May 2010

Volume

63

Issue

5

Start / End Page

1238 / 1246

Location

United States

Related Subject Headings

  • Water
  • Thermography
  • Sensitivity and Specificity
  • Reproducibility of Results
  • Phantoms, Imaging
  • Nuclear Medicine & Medical Imaging
  • Image Interpretation, Computer-Assisted
  • Image Enhancement
  • Algorithms
  • Adipose Tissue
 

Citation

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Soher, B. J., Wyatt, C., Reeder, S. B., & MacFall, J. R. (2010). Noninvasive temperature mapping with MRI using chemical shift water-fat separation. Magn Reson Med, 63(5), 1238–1246. https://doi.org/10.1002/mrm.22310
Soher, Brian J., Cory Wyatt, Scott B. Reeder, and James R. MacFall. “Noninvasive temperature mapping with MRI using chemical shift water-fat separation.Magn Reson Med 63, no. 5 (May 2010): 1238–46. https://doi.org/10.1002/mrm.22310.
Soher BJ, Wyatt C, Reeder SB, MacFall JR. Noninvasive temperature mapping with MRI using chemical shift water-fat separation. Magn Reson Med. 2010 May;63(5):1238–46.
Soher, Brian J., et al. “Noninvasive temperature mapping with MRI using chemical shift water-fat separation.Magn Reson Med, vol. 63, no. 5, May 2010, pp. 1238–46. Pubmed, doi:10.1002/mrm.22310.
Soher BJ, Wyatt C, Reeder SB, MacFall JR. Noninvasive temperature mapping with MRI using chemical shift water-fat separation. Magn Reson Med. 2010 May;63(5):1238–1246.
Journal cover image

Published In

Magn Reson Med

DOI

EISSN

1522-2594

Publication Date

May 2010

Volume

63

Issue

5

Start / End Page

1238 / 1246

Location

United States

Related Subject Headings

  • Water
  • Thermography
  • Sensitivity and Specificity
  • Reproducibility of Results
  • Phantoms, Imaging
  • Nuclear Medicine & Medical Imaging
  • Image Interpretation, Computer-Assisted
  • Image Enhancement
  • Algorithms
  • Adipose Tissue