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High‐contrast resolution of CT images for bone structure analysis
Author(s) -
Durand Eric P.,
Rüegsegger Peter
Publication year - 1992
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.596847
Subject(s) - optical transfer function , aliasing , optics , point spread function , convolution (computer science) , fourier transform , image resolution , fast fourier transform , spatial frequency , resolution (logic) , transformation (genetics) , transfer function , contrast (vision) , computed radiography , physics , image quality , computer science , algorithm , computer vision , artificial intelligence , image (mathematics) , filter (signal processing) , biochemistry , chemistry , electrical engineering , artificial neural network , gene , engineering , quantum mechanics
The modulation transfer function (MTF) of an imaging system may be used as a figure of merit to assess its geometrical resolution. As such it is often derived from the point spread function (PSF) through a Fourier transformation, or through a FFT in case of digital images. Using the special features of the convolution‐backprojection algorithm and making some simplifying assumptions about the number of rays, it is shown that the desired MTF is also obtainable without a Fourier transformation of the PSF, different shapes and sizes of the beam‐profile are then analyzed, and finally it is shown that calculated and measured MTF functions are in good agreement. The effects of aliasing on the cutoff frequency are also discussed.