Fig. 3.

Phantom study using a water-filled bucket. (a) Photograph of the bucket with black fiducial corner markers and reference positioning plate above. (b) A simplified 3D model of the water bucket from the surface scan. (c) The cumulative Cherenkov image of the water bucket in one rotational position, with corresponding (d) Cherenkov UV map layout and (e) Cherenkov texture on the 3D model. (f) The cumulative Cherenkov distribution from the water bucket in rotations 1 and 2 projected onto a UV map for the bucket. (g) The locations of the black fiducial marker corners in the UV map with a red dot marking the corners used to evaluate spatial accuracy, and (h) compared with the cumulative Cherenkov distribution.