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Fig. 2 | European Radiology Experimental

Fig. 2

From: Optimising dual-energy CT scan parameters for virtual non-calcium imaging of the bone marrow: a phantom study

Fig. 2

Increased spectral separation and dose decrease noise in virtual non-calcium images. Image noise decreases continuously as dose (a) and spectral separation (b) is increased. Image noise is defined as the standard deviation in the bone on virtual non-calcium images. Tube-voltage combinations are sorted with increasing spectral separation from left to right in (b). CTDIvol could not be set below 1.5 mGy at 100 kV/Sn150 kV and 3 mGy at 80 kV/140 kV. c No correlation can be seen between increased dose and accuracy, defined as mean error between the fluid within bone against the same fluid outside bone. CTDIvol volume computed tomography dose index; HU Hounsfield units; rs Spearman rank correlation coefficient; Sn indicates the use of a 0.6-mm tin filter

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