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1H MRI phase thermometry in vivo in canine brain, muscle, and tumor tissue.

Publication ,  Journal Article
MacFall, JR; Prescott, DM; Charles, HC; Samulski, TV
Published in: Med Phys
October 1996

The temperature sensitivity of the chemical shift of water (approximately 0.01 ppm/degree C) provides a potential method to monitor temperature changes in vivo or in vitro through the changes in phase of a gradient-echo magnetic resonance (MR) image. This relation was studied at 1.5 T in gel materials and in vivo in canine brain and muscle tissue, heated with a radio frequency (rf) annular phased array hyperthermia antenna. The rf fields associated with heating (130 MHz) and imaging (64 MHz) were decoupled using bandpass filters providing isolation in excess of 100 dB, thus allowing simultaneous imaging and rf heating without deterioration of the MR image signal-to-noise ratio. In a gel, temperature sensitivity of the MR image phase was observed to be (4.41 +/- 0.02) phase degrees/degree C for Te = 20 ms, which allowed temperature changes of 0.22 degree C to be resolved for a 50-mm3 region in less than 10 s of data acquisition. In vivo, for Te = 20 ms, the temperature sensitivity was (3.2 +/- 0.1) phase degrees/degree C for brain tissue, (3.1 +/- 0.1) phase degrees/degree C for muscle, and (3.0 +/- 0.2) phase degrees/degree C for a muscle tumor (sarcoma), allowing temperature changes of 0.6 degree C to be resolved in a 16-mm3 volume in less than 10 s of data acquisition. We conclude that, while the technique is very sensitive to magnetic field inhomogeneity, stability, and subject motion, it appears to be useful for in vivo temperature change measurement.

Duke Scholars

Published In

Med Phys

DOI

ISSN

0094-2405

Publication Date

October 1996

Volume

23

Issue

10

Start / End Page

1775 / 1782

Location

United States

Related Subject Headings

  • Water
  • Temperature
  • Sensitivity and Specificity
  • Sarcoma
  • Nuclear Medicine & Medical Imaging
  • Muscle, Skeletal
  • Magnetic Resonance Imaging
  • Hyperthermia, Induced
  • Hydrogen
  • Forelimb
 

Citation

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ICMJE
MLA
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MacFall, J. R., Prescott, D. M., Charles, H. C., & Samulski, T. V. (1996). 1H MRI phase thermometry in vivo in canine brain, muscle, and tumor tissue. Med Phys, 23(10), 1775–1782. https://doi.org/10.1118/1.597760
MacFall, J. R., D. M. Prescott, H. C. Charles, and T. V. Samulski. “1H MRI phase thermometry in vivo in canine brain, muscle, and tumor tissue.Med Phys 23, no. 10 (October 1996): 1775–82. https://doi.org/10.1118/1.597760.
MacFall JR, Prescott DM, Charles HC, Samulski TV. 1H MRI phase thermometry in vivo in canine brain, muscle, and tumor tissue. Med Phys. 1996 Oct;23(10):1775–82.
MacFall, J. R., et al. “1H MRI phase thermometry in vivo in canine brain, muscle, and tumor tissue.Med Phys, vol. 23, no. 10, Oct. 1996, pp. 1775–82. Pubmed, doi:10.1118/1.597760.
MacFall JR, Prescott DM, Charles HC, Samulski TV. 1H MRI phase thermometry in vivo in canine brain, muscle, and tumor tissue. Med Phys. 1996 Oct;23(10):1775–1782.

Published In

Med Phys

DOI

ISSN

0094-2405

Publication Date

October 1996

Volume

23

Issue

10

Start / End Page

1775 / 1782

Location

United States

Related Subject Headings

  • Water
  • Temperature
  • Sensitivity and Specificity
  • Sarcoma
  • Nuclear Medicine & Medical Imaging
  • Muscle, Skeletal
  • Magnetic Resonance Imaging
  • Hyperthermia, Induced
  • Hydrogen
  • Forelimb