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Related Concept Videos

Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Assessment of Cardiac Function and Myocardial Morphology Using Small Animal Look-locker Inversion Recovery SALLI MRI in Rats
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Fast, interleaved, Look-Locker-based T1 mapping with a variable averaging approach: Towards temperature mapping at

Marco Fiorito1, Maksym Yushchenko1, Davide Cicolari2

  • 1Department of Biomedical Engineering, Center for Adaptable MRI Technology, University of Basel, Allschwil, Switzerland.

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Summary

This study introduces a new magnetic resonance thermometry method for low-field MRI, improving temperature accuracy for thermal therapies. The technique offers a viable alternative to current standards in accessible, lower-cost imaging settings.

Keywords:
MR thermometryT1 mappinghyperthermialow-field MRItemperature mapping

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Area of Science:

  • Medical Imaging
  • Biophysics
  • Thermometry

Background:

  • Proton resonance frequency shift (PRFS) is the standard for magnetic resonance thermometry but is limited to high-field MRI.
  • Low-field MRI offers advantages in accessibility and cost but requires alternative thermometry methods.
  • Current alternatives like fat-based thermometry have limitations, especially at low fields.

Purpose of the Study:

  • To develop and validate a novel magnetic resonance thermometry technique for low-field (0.1 T) MRI.
  • To assess the feasibility of MR-guided thermal therapies at low magnetic field strengths.
  • To improve temperature quantification accuracy and precision in low-field MRI settings.

Main Methods:

  • An interleaved Look-Locker-based mapping sequence was developed for temperature quantification at 0.1 T.
  • A variable averaging scheme was implemented to optimize signal-to-noise ratio during mapping.
  • Calibrated samples were used to evaluate the accuracy and precision of the proposed method.

Main Results:

  • The proposed method achieved an average accuracy of 85% ± 4% in 10 minutes with a variable averaging scheme.
  • This represents an improvement over the 77% ± 7% accuracy obtained with standard averaging.
  • Reconstructed temperature maps showed a precision of 3.0°C ± 1.1°C and accuracy of 1.5°C ± 1.0°C between 29.0°C and 41.7°C.

Conclusions:

  • The developed low-field MR thermometry technique is accurate and precise, suitable for temperature quantification.
  • This method holds promise for applications like MR-guided mild hyperthermia treatments at low-field MRI.
  • The findings support the use of low-field MRI for accessible and cost-effective thermal therapies.