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Towards real-time thermometry using simultaneous multislice MRI.

P T S Borman1, C Bos, T de Boorder

  • 1Department of Radiotherapy, University Medical Center Utrecht, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands. Imaging Division, University Medical Center Utrecht, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands.

Physics in Medicine and Biology
|August 16, 2016
PubMed
Summary
This summary is machine-generated.

Simultaneous multislice (SMS) accelerates MR-guided thermal therapies, improving temperature measurement precision. This technique enhances spatial coverage or temporal resolution for noninvasive MR thermometry during treatments like MR-guided high-intensity focused ultrasound (MRgHIFU).

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Area of Science:

  • Medical Imaging
  • Oncology
  • Neurology

Background:

  • MR-guided thermal therapies, including MR-guided high-intensity focused ultrasound (MRgHIFU) and laser-induced thermal therapy (MRgLITT), are vital in oncology and neurology.
  • Magnetic Resonance Imaging (MRI) enables noninvasive temperature monitoring via proton resonance frequency shift (PRFS) thermometry for therapy guidance.

Purpose of the Study:

  • To evaluate the effectiveness of simultaneous multislice (SMS) parallel imaging with controlled aliasing (CAIPIRINHA) for accelerating PRFS thermometry.
  • To compare the performance of SMS acceleration against sensitivity encoding (SENSE) for enhancing temporal resolution and spatial coverage in MR thermometry.

Main Methods:

  • Two experiments were conducted using agar gel with MRgLITT and bovine muscle with MRgHIFU, employing gradient-echo sequences.
  • Scans were performed with unaccelerated sequences and accelerated sequences using SMS, SENSE, and combined SENSE/SMS techniques.
  • Temperature accuracy was assessed by comparing temperature curves, and precision was quantified using standard deviation analysis on non-heated scans.

Main Results:

  • SMS acceleration maintained accuracy in temperature measurements during both MRgLITT and MRgHIFU experiments.
  • SMS demonstrated significantly higher precision compared to SENSE, indicating its potential for greater acceleration factors.
  • SMS achieved acceleration factors of up to 4 (MRgLITT) and 3 (MRgHIFU) with a precision loss of less than a factor of 3.

Conclusions:

  • Simultaneous multislice (SMS) acceleration is a valuable technique for PRFS thermometry in MR-guided thermal therapies.
  • SMS offers improved temporal resolution or spatial coverage with enhanced precision, making it a beneficial addition to existing acceleration methods like SENSE.
  • This advancement supports more effective noninvasive temperature monitoring during oncological and neurological treatments.