Do Commonly Used B-values Yield Accurate Apparent Kurtosis Values?

Introduction The diffusion restrictions present in biological tissue result in deviations from the Gaussian propagator shape, which can be quantified using the apparent kurtosis Kapp [1]. Kapp is defined by eq. 1, where <φ > is the expectation value of the n-th power of the spin phase, and it appears in the expansion of the logarithmic signal in powers of b (eq. 2). [ ] 2); ( ... 6 ) 0 ( ) ( ln ); 1 ( 3 4 3 2 2 2 2 4 + + + + − = − = b B b A K D b D b S b S K app app app app φ φ