The Shepp–Logan phantom is a standard test image created by Larry Shepp and Benjamin F. Logan for their 1974 paper "The Fourier Reconstruction of a Head Section". It serves as the model of a human head in the development and testing of image reconstruction algorithms.
Definition The function describing the phantom is defined as the sum of 10 ellipses inside a 2×2 square: Ellipse Center Major Axis Minor Axis Theta Gray Level a (0,0) 0.69 0.92 0 2 b (0,−0.0184) 0.6624 0.874 0 −0.98 c (0.22,0) 0.11 0.31 −18° −0.02 d (−0.22,0) 0.16 0.41 18° −0.02 e (0,0.35) 0.21 0.25 0 0.01 f (0,0.1) 0.046 0.046 0 0.01 g (0,−0.1) 0.046 0.046 0 0.01 h (−0.08,−0.605) 0.046 0.023 0 0.01 i (0,−0.605) 0.023 0.023 0 0.01 j (0.06,−0.605) 0.023 0.046 0 0.01
References
See also Imaging phantom