Needle artifact characteristics and insertion accuracy using a 1.2 T open MRI scanner: A phantom study

• Clinical use of a 1.2 Tesla open system for MRI-guided intervention is awaited. Needle artifact characteristics using MRI are clarified phantom study. Accuracy needle insertion acceptable clinical use. To evaluate the artifacts and accuracy magnetic resonance imaging (MRI) in phantom. First, apparent width on tip position error 16- 18-gauge MRI-compatible introducer needles 17-gauge cryoneedle were examined with different angles (0°, 30°, 45°, 60°, 90°) to main field (B0), sequence types (balanced steady-state acquisition rewound gradient echo [BASG] T2-weighted fast spin [FSE] sequence), frequency encoding directions. Second, was evaluated after 10 fluoroscopy-guided insertions The widths larger when angle axis relative B0 larger. appeared BASG than FSE images, largest 16-, 17-, 14.3, 11.6, 11.0 mm, respectively. always more distal actual longitudinal 4.0 mm. Meanwhile, tips proximal images right-to-left direction. mean 3.1 These experiments clarify MRI. With this system, demonstrated an