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European Radiology Experimental
Fig. 2. | European Radiology Experimental

Fig. 2.

From: Virtual monoenergetic images from photon-counting spectral computed tomography to assess knee osteoarthritis

Fig. 2.

Noise standard deviation (SD) (left) and contrast-to-noise ratio (CNR) (right) for the cartilage for all of the monoenergetic images (40−110 keV) and the conventional image (HU). Plots display median and confidence intervals across the seven samples, with red crosses to indicate outliers. Top: Region-of-interest masks used for the analysis. Noise is computed as the SD within the circular region in the cartilage. CNR is computed as the contrast given by black lines 1 and 2 divided by the SD

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