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. Author manuscript; available in PMC: 2016 May 1.
Published in final edited form as: Magn Reson Med. 2014 Jun 5;73(5):1803–1811. doi: 10.1002/mrm.25300

Figure 3.

Figure 3

(a) Axial view (cross-section of the stylet) and (b) sagittal view (along and perpendicular to the shaft) of the B1− EM field simulation with an 8-mm-long micro-coil attached to a metallic stylet. (c) Axial view and (d) sagittal view the B1− EM field simulation with the same micro-coil attached to an insulating stylet. Note that the lobe pattern obtained with the metallic substrate is far smaller than that with the insulating substrate. (e) A high-resolution MR image of a tracking coil mounted on the metallic stylet, acquired with a 3D Turbo Spin Echo sequence. The imaging slice was oriented in the sagittal plane along the active stylet shaft. It demonstrates that strong signal is obtained ~5 mm away from the needle surface.