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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:
References
Shepp–Logan phantom Wikipedia(Text) CC BY-SA