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How MRI compatible is "MRI compatible"? A systematic comparison of artifacts caused by biopsy needles at 3.0 and 1.5

Tobias Penzkofer1,2, Nilufar Peykan3, Katja Schmidt4

  • 1Department of Diagnostic and Interventional Radiology, RWTH Aachen University Hospital, Pauwelsstr. 30, Aachen, 52074, Germany. tpenzkofer@ukaachen.de.

Cardiovascular and Interventional Radiology
|April 13, 2013
PubMed
Abstract

Insights

MRI-compatible needles create varying artifacts, significantly influenced by needle/mandrin type and orientation, not just field strength or sequence. Careful selection based on procedure is crucial for minimizing imaging interference.

Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Interventional Radiology

Background:

  • Magnetic Resonance Imaging (MRI) guided interventions require specialized tools.
  • Understanding imaging artifacts from interventional needles is critical for diagnostic accuracy and patient safety.
  • Existing
  • Purpose_of_the_Study: [
  • To systematically evaluate imaging artifacts generated by various MRI-compatible interventional needles.
  • To investigate the impact of magnetic field strength, needle/mandrin composition, orientation, and pulse sequence on artifact size.
  • To provide data for informed needle selection in MRI-guided procedures.

Purpose of the Study:

  • To systematically evaluate imaging artifacts generated by various MRI-compatible interventional needles.
  • To investigate the impact of magnetic field strength, needle/mandrin composition, orientation, and pulse sequence on artifact size.
  • To provide data for informed needle selection in MRI-guided procedures.

Main Methods:

  • Eight MRI-compatible needles were tested in porcine tissue.
  • Examinations were conducted at 1.5 T and 3.0 T using balanced-steady-state-free-precession (B-SSFP) and T1-weighted-spoiled-gradient-echo (T1-SPGR) sequences.
  • Needle orientation relative to the B0 field was varied, and artifact diameters (inner and outer) were measured and analyzed.

Main Results:

  • Significant variations in artifact size were observed, primarily driven by needle and mandrin type, and needle orientation.
  • Artifact dimensions ranged from 0.7 mm to 71.4 mm.
  • Pulse sequence and field strength had a lesser impact; inner artifact sizes were comparable across field strengths and slightly larger in B-SSFP compared to T1-SPGR sequences.

Conclusions:

  • Despite being labeled
  • MR compatible,
  • interventional needles exhibit substantial differences in artifact generation.
  • Mandrin type and needle orientation are key factors influencing artifact size.
  • An empirical approach to needle selection, considering lesion characteristics and trajectory, is recommended.

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