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. 2021 Apr 23;16(5):741–748. doi: 10.1007/s11548-021-02364-7

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© The Author(s) 2021

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Fig. 6 — Visualization of the error measurements. The green cylinder represents the projected core from the low-field MRI system, and the red cylinder represents the ground truth core. The blue line represents the center-to-center distance between the cores, and the black line represents the shortest perpendicular distance between the planned target and the true core trajectory (point to line)