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 β between the needles and the main magnetic field (B0).
Results
Depending on the needle angle β 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 1.5T and 0.2 T, low field strength is superior for passive visualization of the needles tested—especially if GE imaging is performed.
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Frahm, C., Gehl, HB., Melchert, U.H. et al. Visualization of magnetic resonance-compatible needles at 1.5 and 0.2 Tesla. Cardiovasc Intervent Radiol 19, 335–340 (1996). https://doi.org/10.1007/BF02570186
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DOI: https://doi.org/10.1007/BF02570186