Unit calculations - DWI MRI (Stejskal-Tanner)

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Homework Statement:
Calculate the apparent diffusion based on experimental data.
Relevant Equations:
I = e^bD
b = gamma^2 * delta^2 * G^2 *(tau - delta/3)
Ok, so basically my task is to calculate the apparent diffusion D based on experimental data, which is kind of easy, BUT the problem is with unit of b...
Gamma is gyromagnetic ratio and can be expressed as: (s*T)-1 or MHz/T --> but I am not so sure, teacher did not specify
Delta is the pulse length: ms
G is the gradient of magnetic field: Gs/cm
tau - repetition time: ms

So I tried...
b = [(MHz/T)2*(ms)2*(Gs/cm)*ms] = [s/cm2 * 10-5]

How am I supposed to get b in s/cm2 from those units? How to let go that 10^-5? Or maybe it's ok, but I'm missing something when it comes to understanding.
 

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