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Non-Enhanced MR Imaging of Cerebral Arteriovenous Malformations at 7 Tesla

Karsten H Wrede1,2, Philipp Dammann3,4, Sören Johst3

  • 1Erwin L. Hahn Institute for Magnetic Resonance Imaging, University Duisburg-Essen, 45141, Essen, Germany. karsten.wrede@uk-essen.de.

European Radiology
|June 18, 2015
PubMed
Abstract

Insights

Ultra-high-field 7 Tesla MRA offers excellent non-contrast imaging for intracerebral arteriovenous malformations (AVMs), comparable to digital subtraction angiography. This advanced MRA technique shows promise for AVM assessment.

Area of Science:

  • Radiology and Imaging Science
  • Neurovascular Imaging
  • Magnetic Resonance Imaging

Background:

  • Intracerebral arteriovenous malformations (AVMs) require accurate imaging for diagnosis and management.
  • Conventional 1.5 Tesla time-of-flight (TOF) magnetic resonance angiography (MRA) has limitations in AVM delineation.
  • Digital subtraction angiography (DSA) is an established but invasive imaging modality for AVMs.

Purpose of the Study:

  • To prospectively compare 7 Tesla (7T) TOF MRA and 7T non-contrast-enhanced magnetization-prepared rapid acquisition gradient-echo (MPRAGE) with 1.5T TOF MRA and DSA for intracerebral AVM depiction.
  • To evaluate the image quality and diagnostic performance of ultra-high-field MRA in visualizing AVM components.

Main Methods:

  • Twenty patients with intracerebral AVMs underwent imaging with 1.5T TOF MRA, 7T TOF MRA, and 7T non-contrast-enhanced MPRAGE.
  • All patients also underwent four-vessel 3D digital subtraction angiography (DSA).
  • Two radiologists assessed AVM features (nidus, feeders, draining veins, vessel relationship) and image quality using a five-point scale.

Main Results:

  • Both 7T MRA sequences demonstrated superior performance compared to 1.5T TOF MRA in assessing all evaluated AVM features.
  • Image quality achieved with 7T MRA was comparable to that of DSA.
  • Good to excellent inter-observer agreement was observed for most image ratings.

Conclusions:

  • Non-contrast-enhanced 7T MRA provides excellent image quality for delineating intracerebral AVMs, rivaling DSA.
  • Ultra-high-field MRA represents a promising, non-invasive tool for the clinical assessment of AVMs.
Keywords:
7 TeslaArteriovenous malformationMPRAGEMagnetic resonance angiographyTOF MRA

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