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. Author manuscript; available in PMC: 2016 Oct 21.
Published in final edited form as: Phys Med Biol. 2015 Sep 25;60(20):7877–7891. doi: 10.1088/0031-9155/60/20/7877

Figure 2.

Figure 2

Plot of an active tumour volume mean signal intensity (S) vs b-value fitted by monoexponential (adjusted R2 = 0.9860) and biexponential, i.e. IVIM (adjusted R2 = 0.9977) models. Using F test, the IVIM model gave a significantly lower residual fit error to the signal vs b-value data of active tumour volume of this subject’s DW-MRI scan than the monoexponential model at 5% significance level. At low b-values, the signal decay originates from both perfusion (fast component) and diffusion (slow component), whereas at high b-values, mainly from diffusion.