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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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Quantifying cerebral microbleeds using quantitative susceptibility mapping from magnetization-prepared rapid

Nashwan Naji1, Myrlene Gee2, Glen C Jickling2

  • 1Department of Biomedical Engineering, University of Alberta, Edmonton, Alberta, Canada.

NMR in Biomedicine
|March 11, 2024
PubMed
Summary
This summary is machine-generated.

Magnetization-prepared rapid gradient-echo quantitative susceptibility mapping (MPRAGE-QSM) can detect microbleeds in brain imaging. This method offers comparable sensitivity to standard techniques at 3 Tesla and above, with no extra time cost.

Keywords:
3 TMPRAGEQSMmicrobleed

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Area of Science:

  • Neuroimaging
  • Medical Physics
  • Radiology

Background:

  • T1-weighted magnetization-prepared rapid gradient-echo (MPRAGE) is standard for brain structural imaging.
  • MPRAGE phase images offer potential for microbleed assessment via quantitative susceptibility mapping (QSM).
  • Microbleeds are critical markers in various neurological conditions.

Purpose of the Study:

  • To evaluate the potential of MPRAGE-based QSM for assessing microbleed burden.
  • To compare the detection sensitivity and accuracy of MPRAGE-QSM against standard multiecho gradient echo QSM (MEGE-QSM).
  • To explore factors influencing MPRAGE-QSM image quality and detection performance.

Main Methods:

  • In vivo QSM analysis of 108 microbleeds in 15 subjects using 3-T MPRAGE and MEGE sequences.
  • Simulations to assess MPRAGE-QSM sensitivity across varying magnetic field strengths (1.5T, 3T, 7T), echo times, and microbleed characteristics (size, susceptibility, location).
  • Comparison of microbleed size, mean susceptibility, and total susceptibility estimates between MPRAGE-QSM and MEGE-QSM.

Main Results:

  • In vivo MPRAGE-QSM detected microbleeds with comparable sensitivity to MEGE-QSM, although appearing smaller and with higher mean susceptibility.
  • Total susceptibility estimates from MPRAGE-QSM closely agreed with MEGE-QSM (slope: 0.97, r²: 0.94).
  • Simulations showed MPRAGE-QSM detection sensitivity improved significantly at 3T and 7T compared to 1.5T, with detection rates of 0.80 and 0.88 respectively for microbleeds of at least one-voxel diameter and 0.4-ppm susceptibility.

Conclusions:

  • MPRAGE-QSM is a viable method for detecting and quantifying microbleeds (≥1 voxel) at 3T or higher magnetic fields without additional scan time.
  • Total susceptibility measurements are more robust to sequence variations, potentially enabling data harmonization across different imaging protocols.
  • MPRAGE-QSM is particularly valuable when standard T2*-weighted images are unavailable or lack sufficient spatial resolution for microbleed detection.