Fast MRI of RF heating via phase difference mapping

Erik M. Shapiro, Arijitt Borthakur, Michael J. Shapiro, Ravinder Reddy, John S. Leigh

Research output: Contribution to journalArticle

  • 17 Citations

Abstract

A method is presented for the rapid acquisition of temperature maps derived from phase difference maps. The temperature-dependent chemical shift coefficients (TDCSCs) of various concentrations of aqueous cobalt and dysprosium-based compounds were measured. The largest TDCSC calculated was for 100 mM DyEDTA, which had a TDCSC of -0.09 PPM/K; 160 mM CoCl2 had a TDCSC of -0.04 PPM/K. These temperature-dependent chemical shifts (TDCSs) result in phase changes in the MR signal with changing temperature. Agarose phantoms were constructed with each paramagnetic metal. A fast gradient-echo (FGRE) MR image was acquired to serve as the baseline image. A "test" MRI procedure was then performed on the phantom. Immediately afterwards, a second FGRE MR image was acquired, serving as the probing image. Proper image processing as a phase difference map between the probing image and the baseline image resulted in an image which quantitatively described the temperature increase of the phantom in response to a particular "test" imaging experiment. Applications of this technique in assessing the safety of pulse sequences and MR coils are discussed.

Original languageEnglish (US)
Pages (from-to)492-498
Number of pages7
JournalMagnetic Resonance in Medicine
Volume47
Issue number3
DOIs
StatePublished - 2002
Externally publishedYes

Profile

Heating
Temperature
Dysprosium
Cobalt
Sepharose
Metals
Safety

Keywords

  • MRI
  • Paramagnetic
  • Radiofrequency heating
  • RF coil
  • Temperature

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

Cite this

Shapiro, E. M., Borthakur, A., Shapiro, M. J., Reddy, R., & Leigh, J. S. (2002). Fast MRI of RF heating via phase difference mapping. Magnetic Resonance in Medicine, 47(3), 492-498. DOI: 10.1002/mrm.10067

Fast MRI of RF heating via phase difference mapping. / Shapiro, Erik M.; Borthakur, Arijitt; Shapiro, Michael J.; Reddy, Ravinder; Leigh, John S.

In: Magnetic Resonance in Medicine, Vol. 47, No. 3, 2002, p. 492-498.

Research output: Contribution to journalArticle

Shapiro, EM, Borthakur, A, Shapiro, MJ, Reddy, R & Leigh, JS 2002, 'Fast MRI of RF heating via phase difference mapping' Magnetic Resonance in Medicine, vol 47, no. 3, pp. 492-498. DOI: 10.1002/mrm.10067
Shapiro EM, Borthakur A, Shapiro MJ, Reddy R, Leigh JS. Fast MRI of RF heating via phase difference mapping. Magnetic Resonance in Medicine. 2002;47(3):492-498. Available from, DOI: 10.1002/mrm.10067

Shapiro, Erik M.; Borthakur, Arijitt; Shapiro, Michael J.; Reddy, Ravinder; Leigh, John S. / Fast MRI of RF heating via phase difference mapping.

In: Magnetic Resonance in Medicine, Vol. 47, No. 3, 2002, p. 492-498.

Research output: Contribution to journalArticle

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