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The following terms are commonly used in radiology. b value The b factor or b value is associated with diffusion-weighted magnetic resonance imaging (diffusion-weighted MRI or DWI). It measures “strength (intensity and timing) of the diffusion gradient”; units are seconds per square millimeter.maximum b value of 1221 s/mm2 Four gradient strengths were applied, resulting in b values of 0 and 1000 s/mm2 applied sequentially in the X, Y, and Z gradient directions. Doppler See , Cardiology, Echocardiography. echo train A sequence of echoes. “Echo train is not a unit of measure” but is expressed as in these examples: echo train Less