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MR thermometry near metallic devices using multispectral imaging.

Hans Weber1, Valentina Taviani1, Daehyun Yoon1

  • 1Department of Radiology, Stanford University, Palo Alto, California, USA.

Magnetic Resonance in Medicine
|March 19, 2016
PubMed
Summary
This summary is machine-generated.

Multispectral imaging (MSI) enables noninvasive temperature measurement near metal implants, overcoming limitations of traditional MR thermometry. This advancement expands treatment options for patients with metallic devices, improving MR-guided focused ultrasound therapy accessibility.

Keywords:
T1 mappingdistortion correctionmetal artifactsmetal-induced distortionsmetallic implantsmultispectral imagingproton resonance frequency shiftsusceptibility artifacttemperaturethermometry

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Area of Science:

  • Magnetic Resonance Imaging
  • Biomedical Engineering
  • Medical Physics

Background:

  • MR thermometry is crucial for MR-guided focused ultrasound therapy.
  • Metallic implants create field inhomogeneities, hindering conventional MR thermometry.
  • This limits treatment options for patients with metal implants.

Purpose of the Study:

  • To evaluate the feasibility of multispectral imaging (MSI) for noninvasive temperature measurement near metallic implants.
  • To assess MSI's effectiveness in strong magnetic field inhomogeneities.
  • To leverage the temperature dependency of T1 relaxation time for accurate thermometry.

Main Methods:

  • A two-dimensional inversion-recovery-prepared MSI (2DMSI) pulse sequence was developed for artifact-reduced T1 mapping.
  • T1 maps were acquired in a metallic implant phantom at varying temperatures.
  • Proton resonance frequency shift (PRFS) thermometry was performed for comparison.

Main Results:

  • 2DMSI provided artifact-reduced T1 mapping with 1.9 mm in-plane resolution and 5 min temporal resolution.
  • Temperature measurements were accurate within 1.4°C over a 30°C range.
  • MSI temperature map quality was unaffected by proximity to metal, unlike PRFS thermometry.

Conclusions:

  • MSI successfully enabled noninvasive temperature measurement near metal implants.
  • This technique overcomes limitations of PRFS thermometry in the presence of metallic artifacts.
  • MSI expands the applicability of MR-guided therapies for patients with metal implants.