Meeting Banner
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.

This abstract and the presentation materials are available to members only; a login is required.

Join Here