Below is an image of a SPECT phantom. Using the ROI stats below, calculate the c...

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Below is an image of a SPECT phantom. Using the ROI stats below, calculate the contrast to noise ratio in the central darker region to 2 decimal places.

 

 

Yellow ROI (central region): Mean = 4.83, Min = 4.15, Max = 5.56, Median = 4.83, standard deviation = 0.32

Red ROI (other region): Mean = 0.96, Min = 0.82, Max = 1.30, Median = 0.92, standard deviation = 0.12

 

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