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. 2021 Aug 14;40(2):147–158. doi: 10.1007/s11604-021-01187-5

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© The Author(s) 2021

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Fig. 3 — The effect of imaging plane and head position. a Effect of the imaging plane. The values of bilateral ALPS index with a large spherical region of interest calculated from the images on the anterior commissure-posterior commissure line and infra-orbital meatal line are shown. The intraclass correlation coefficient for the bilateral ALPS-index value was 0.19, indicating low-level reproducibility. b Effect of head position. The values of bilateral ALPS index with a large spherical region of interest calculated from the images on the anterior commissure-posterior commissure line acquired with a neutral head position and a chin-raising (approximately 20°) position. The intraclass correlation coefficient for the bilateral ALPS-index value was 0.22, indicating low-level reproducibility