Image receptor homogeneity

From AutoPIA
Jump to: navigation, search

Deviation in mean pixel value

$ MPVRatio_i= \frac{\mu_i}{\mu_I} $

where:

  • $ \mu_i $: mean pixel value of the i-th ROI
  • $ \mu_I $: mean pixel value of the whole image

Deviation in Signal-to-Noise-Ratio (SNR)

IQI Deviation SNR ROIs.png
IQI Deviation SNR ROIs legend.png


$ SNRRatio_i= \frac{SNR_i}{SNR_I}= \frac{\frac{\mu_i}{\sigma_i}}{\frac{\mu_I}{\sigma_I}} $

where:

  • $ \mu_i $: mean pixel value of the i-th ROI
  • $ \sigma_i $: standard deviation of mean pixel values of the i-th ROI
  • $ \mu_I $: mean pixel value of the whole image
  • $ \sigma_I $: standard deviation of mean pixel values of the whole image