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Table 2 Correlation of grayscales, CT values (Hounsfield Units), and iodine concentration in scans of the staining solution. The Hounsfield Units of I2KI solution (in italics) was calculated through a lineal regression between the Grayscales values and Hounsfield Unit of aqueous formalin solution and air (see Fig. 10a)

From: An investigation of the efficacy and mechanism of contrast-enhanced X-ray Computed Tomography utilizing iodine for large specimens through experimental and simulation approaches

Materials Grayscale values Hounsfield unit Iodine concentration
mmol/L w/v
Aqueous buffered formalin solution 18202 0 0 0
I2KI-buffered formalin solution 21206 394 66 1 %
I2KI-buffered formalin solution 24552 949 199 3 %
I2KI-buffered formalin solution 28058 1531 398 6 %
I2KI-buffered formalin solution 31978 2181 583 8.8 %
Air 12800 −1000 N/A N/A