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. 2023 Mar 7;13:3801. doi: 10.1038/s41598-023-30223-9

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For Fastrak TX2, the green circle (Ø ≈ 40 cm) represents an optimal field (VoM) for digitization, and the red circle (Ø ≈ 120 cm) represents a boundary within which magnetic and conductive objects should be avoided.