Nonlinear polychromatic and noise artifacts in x-ray computed tomography images.

  title={Nonlinear polychromatic and noise artifacts in x-ray computed tomography images.},
  author={Andr{\'e} J. Duerinckx and A l Macovski},
  journal={Journal of computer assisted tomography},
  volume={3 4},
The variance of the image noise in computed X-ray transmission tomography (CT) due to quantum noise is in a first approximation a nonlinear function of X-ray attenuation. Beam hardening in CT is also a nonlinear function of attenuation. We present a theoretical study of both phenomena. Computer simulations and numerical results show that both nonlinear dependencies have quite similar effects on image quality. We also show how the two-dimensional distribution of the noise variance in a CT image… CONTINUE READING


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