JOHNSON G ALLAN PhD; MAKI, JEFFREY H. PhDInvestigative Radiology: June 1991 Original Investigations: PDF Only Buy Abstract Johnson GA, Maki JH. In vivo measurement of proton diffusion in the presence of coherent motion. Invest Radiol 1991;26:540-545. Measurement of the self-diffusion coefficient D of water in tissue has been performed traditionally using the technique proposed by Stejskal and Tanner. A variant of that technique is shown here, employing flow-compensated gradients that significantly reduce the sensitivity to small coherent motions that are common in body imaging. An interleaved sequence with four values of diffusion-sensitizing gradient (b) minimizes registration errors. Eddy currents and other systematic errors are reduced, permitting the measurement of standards in an imaging context within 5% of nonimaging values in the literature. The flow-compensated sequence permits the measure of D for tissues in the abdominal cavity of the rat. We present in vivo measurements of D for the following rat tissues: liver, kidney (cortex), kidney (medulla) muscle, brain, fat. © Lippincott-Raven Publishers.