... DABMP 26 27 Gain image: G (x, y) G (x, y) =G’ (x, y =G’ (x, y)) - Davg(t) (x, y); (x, y); Gavg =(1/N) · ∑ ∑ G (x, y) I (x, y) = Gavg · [Iraw (x, y) (x, y) - Davg(t) (x, y)] (x, y)] / G (x, y) G (x, y) Brent K Stewart, PhD, ... gray level or Hounsfield unit) Typical matrices: ¬ ¬ ¬ CT: 51 2x5 1 2x1 2 bits/pixel CR: 176 0x2 14 0x1 0 bits/pixel DR: 204 8x2 56 0x1 6 bits/pixel c f Bushberg, et al., The Essential Physics of Medical Imaging, ... Subtraction 46 Huda Ch6: Digital XX-ray Imaging Question ¬ 22 22 The matrix size in a DSA image is typically: ¬ A 128 x 128 B 256 x 256 C 512 x 512 D 1024 x 1024 E 2048 x 2048 ¬ ¬ ¬ ¬ c.f Bushberg,...