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. Author manuscript; available in PMC: 2011 Mar 1.
Published in final edited form as: J Magn Reson Imaging. 2010 Mar;31(3):531–537. doi: 10.1002/jmri.22070

Figure 5.

Figure 5

Graph with DDC (x-axis) against ADC (y-axis), with varying α values, according to equation [5] (ADC = bα-1× DDCα). B-values of 0 and 1000 s/mm2 are used to calculate the ADC. If b × DDC = 1, DDC ≈ ADC, regardless of the α value (note that this occurs at a DDC or ADC of 1000 s/mm2 when using a b-value of 1000 s/mm2). If α < 1, and b × DDC > 1, ADC will be lower than DDC. In contrast, if α < 1, and b × DDC < 1, ADC will be higher than DDC. Also recall that the higher the α value, the better ADC and DDC agree (note, at the mono-exponential extreme α = 1, thus DDC = ADC).