MR Imaging‒Guided Intervention: Evaluation of MR Conditional Biopsy and Ablation Needle Tip Artifacts at 3T Using a Balanced Fast Field Echo Sequence.

Published on Mar 31, 2021in Journal of Vascular and Interventional Radiology3.037
· DOI :10.1016/J.JVIR.2021.03.536
Saurabh Singh5
Estimated H-index: 5
(UCLH: University College Hospital),
F Torrealdea1
Estimated H-index: 1
(UCLH: University College Hospital),
Steve Bandula10
Estimated H-index: 10
(UCLH: University College Hospital)
PURPOSE This study systematically investigates artifacts produced by biopsy and ablation needles imaged at various trajectories with respect to the static magnetic field (B0). MATERIALS AND METHODS An acrylic phantom was scanned using a rapid balanced fast field echo sequence (FFE) with 3.0-T MRI. A 15-gauge microwave needle, a 17-gauge cryoneedle and 18-gauge coaxial-biopsy needle were imaged in sagittal and axial planes, in 7 different orientations to B0(0°-15°-30°-45°-60°-75°-90°). For four angles (15°-30°-60°-75°), images were acquired with slice orientation aligned to the angulation of the needle, resulting in the frequency-encoding direction being parallel to the needle long-axis for the sagittal and perpendicular for the axial acquisition. The artifact length at the needle-tip and maximum artifact width were recorded. RESULTS There was no significant difference in mean artifact length for the cryoneedle (13mm, 95%CI 7-19mm) and coaxial-biopsy needle (8mm, 95%CI 5-10, p=0.08). The mean artifact length was significantly smaller for the MWA needle (1mm, 95%CI 0-2, p 15°), the needle tip position can be predicted better from images acquired where the slice orientation is aligned to the needle's angulation.
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