“…There are several application areas where CT images are considered the prime modality. some of these major applications are the following: (1) head and neck cancer diagnosis [219,192,220,221,222,199], (2) cancer treatment [51,223], (3) image segmentation and integration [51,216], (4) lung cancer treatment [224,225,182,226,227,228,229,230,231,232], (5) prostate cancer treatment [148,233,234,150,235,151,154,155,156,236,237,157,158,238,159,239,160,216,128,240,164,241,165,167,168,242,133], (6) 3D conformal radiation therapy…”