Fix and test bounding + masking implementations

[surajpaib]

The issue is discrepancy in values when doing a convex hull along with the padding

Image added shows A-> B-> A inverted. Notice the textures around the body

[surajpaib]

Also a question that needs to be answered is how can the CBCT values in area 1 be masked effectively so that it doesn't introduce artifacts while translating to CT. Notice the difference between areas 1 and 2.