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. 2015 Oct 1;37(1):33. doi: 10.1186/s40902-015-0033-1

Fig. 1.

Fig. 1

Determination of Po point on 3D CT image. Po was defined as the most superior and outer point on the ovoid bony shadow of the external auditory meatus. a Lateral view of 3D reconstruction image. b Frontal view of right Po. c Lateral view of right Po. Po porion