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(a) Low contrast section 2, (b) high contrast section 4 of the image quality phantom. Each section has inserts of four different materials: (1) 1% SIG, (2) 3% SIG, (3) brain, (4) liver, (5) inner bone, (6) acrylic, (7) air and (8) CB2 (bone – 50% CaCO3). These material characteristics are given in Table 2. (c) MV CBCT image of section 2 and (d) MV CBCT image of section 4 of image quality phantom, acquired with 15 MU imaging protocol.
