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Abstract #0576

Effects of Concomitant Fields on Short-Time-Scale Noble Gas Diffusion Measurements

Michael Carl1,2, John P. Mugler III3, Gordon D. Cates2, Wilson Miller3

1GE Healthcare, Applied Science Lab, Milwaukee, WI, USA; 2Physics, University of Virginia, Charlottesville, VA, USA; 3Radiology, University of Virginia, Charlottesville, VA, USA

In previous work we described a specialized pulse sequence designed to access very short diffusion times using noble-gas NMR. In the present work we study the quantitative effects that concomitant fields have on the resulting diffusion measurements, and develop strategies for minimizing or correcting for these effects. We derived an approximate threshold criterion to determine under what circumstances concomitant field distortions remain insignificant compared to the desired diffusion attenuation. Phantom diffusion experiments were performed to confirm our results.