Fig. 7.

(a) DRRs were generated from $-45\mathrm{deg}$ to $+45\mathrm{deg}$ around the AP view. Participants were each time given two images, where one was always AP and the other one was generated from a different view. (b) The translational errors are shown for all four participants. Note that 0 deg in the horizontal axis refers to where the user performed planning on only the AP x-ray image.