Abstract #4204

Distortion measurements empirically validate gradient model impact on diffusion weighting

Dariya I Malyarenko¹, Enzo Barberi², Yuxi Pang¹, Julien Sénégas³, Ajit Devaraj⁴, Johannes Peeters⁵, Teodor Stanescu⁶, and Thomas L Chenevert¹

¹Radiology, University of Michigan, Ann Arbor, MI, United States, ²Modus Medical Devices, London, ON, Canada, ³Philips Research Laboratories, Hamburg, Germany, ⁴Philips Research Laboratories, Cambridge, MA, United States, ⁵Philips MR Clinical Science, Best, Netherlands, ⁶University Health Network, Princess Margaret Cancer Center, Toronto, ON, Canada

Distortion fields induced by gradient nonlinearity were measured for two channels of two MRI systems to validate vendor-provided gradient design models intended for correcting spatially nonuniform diffusion weighting. Excellent agreement was observed between the model and the empiric displacement measurements recast into first two diagonal elements of system nonlinearity tensor for both systems. The measurements were sensitive enough to detect sub-millimeter differences between nominally symmetric right-left and anterior-posterior gradients. Unexplained minor deviation from spatially symmetric design was detected for right-left gradient of both systems by diffusion and distortion measurement.

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