Visualization of magnetic resonance-compatible needles at 1.5 and 0.2 Tesla

Cardiovasc Intervent Radiol. Sep-Oct 1996;19(5):335-40. doi: 10.1007/BF02570186.

Abstract

Purpose: For two types of passively visualizable magnetic resonance (MR)-compatible needles, the size of susceptibility artifacts was investigated at 0.2 and 1.5 Tesla (T) and assessed regarding their suitability for needle visualization.

Methods: Phantom trials were performed using T1-weighted spin echo (SE), turbospin echo (TSE) and gradient echo (GE) sequences and different angles beta between the needles and the main magnetic field (B0).

Results: Depending on the needle angle beta and the applied pulse sequence, we found artifact diameters of 0-9.7 mm employing SE, of 1.7-9.4 mm employing TSE, and of 1.4-20.6 mm employing GE at 1.5 T. At 0.2 T, we found artifact diameters of 0-5.7 mm employing SE, of 0-6.3 mm employing TSE, and of 0-11.3 mm employing GE.

Conclusion: Comparing artifact sizes at 1. 5 T and 0.2 T, low field strength is superior for passive visualization of the needles tested-especially if GE imaging is performed.

Publication types

  • Comparative Study

MeSH terms

  • Artifacts
  • Chromium Alloys / chemistry
  • Equipment Design
  • Humans
  • Image Enhancement
  • Magnetic Resonance Imaging* / instrumentation
  • Magnetic Resonance Imaging* / methods
  • Needles*
  • Phantoms, Imaging
  • Radiology, Interventional

Substances

  • Chromium Alloys