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. 2020 May 29;267(10):2917–2925. doi: 10.1007/s00415-020-09930-0

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© The Author(s) 2020

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Fig. 3 — Head position during MRI acquisition. The anterior commissure–posterior commissure (AC–PC) line should be used to align head position to allow scan comparison, when only 2D acquisitions are possible. This line is typically ~ 9° steeper than the orbito-meatal line, traditionally used in computerised tomography (CT) scans. MRI magnetic resonance imaging, 2D 2 dimensional