Dimensionality and noise in energy selective x-ray imaging.

  title={Dimensionality and noise in energy selective x-ray imaging.},
  author={Robert E. Alvarez},
  journal={Medical physics},
  volume={40 11},
PURPOSE To develop and test a method to quantify the effect of dimensionality on the noise in energy selective x-ray imaging. METHODS The Cramèr-Rao lower bound (CRLB), a universal lower limit of the covariance of any unbiased estimator, is used to quantify the noise. It is shown that increasing dimensionality always increases, or at best leaves the same, the variance. An analytic formula for the increase in variance in an energy selective x-ray system is derived. The formula is used to gain… CONTINUE READING
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