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[Artifacts in magnetic resonance angiography]

A Carriero1, N Magarelli, L Tamburri

  • 1Istituto di Scienze Radiologiche, Università G. D'Annunzio, Chieti.

La Radiologia Medica
|December 1, 1994
PubMed
Summary

This study assessed Magnetic Resonance Angiography (MRA) artifacts using 2D and 3D time-of-flight (TOF) techniques. Familiarity with common artifacts like saturation and MIP helps prevent misinterpretation in MRA imaging.

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Area of Science:

  • Radiology
  • Medical Imaging
  • Diagnostic Techniques

Background:

  • Magnetic Resonance Angiography (MRA) is crucial for vascular imaging.
  • Artifacts can compromise the diagnostic quality of MRA scans.
  • Understanding artifact incidence is key to improving MRA interpretation.

Purpose of the Study:

  • To assess and classify the frequency of artifacts in 2D and 3D time-of-flight (TOF) MRA.
  • To identify common artifact types across different vascular regions.

Main Methods:

  • Analysis of 300 MRA examinations (January 1991 - April 1993).
  • Selection of the first 10 examinations with artifacts per vascular region.
  • Inclusion of hardware, sequence, magnetic susceptibility, patient, and MIP artifacts.

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Main Results:

  • Intracranial vessels: Saturation and magnetic susceptibility (30% each).
  • Neck vessels: Turbulence (40%) and lack of inclusion (30%).
  • Thoracic vessels: MIP (50%) and ghost (30%).
  • Abdominal aorta: MIP, voluntary movement, peristalsis, and magnetic susceptibility (20% each).
  • Renal arteries: Saturation and respiratory movement (30% each).
  • Inferior vena cava: MIP (40%).
  • Lower limbs: MIP (40%) and patient movement (30%).

Conclusions:

  • Artifacts vary significantly by vascular region and TOF sequence (2D/3D).
  • Common artifacts include saturation, magnetic susceptibility, MIP, turbulence, and movement-related issues.
  • Knowledge of artifact types and principles aids in avoiding diagnostic pitfalls in MRA.