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Abstract #2764

Gradient nonlinearity Correction on ADC measurement: A multi-platform study on Diffusion weighted imaging

Chien-Lin Yeh 1,2 , Ruoyun Ma 1,2 , Brain Dale 3 , Thomas L. Chenevert 4 , Michael A. Boss 5 , and Chen Lin 2

1 School of Health Sciences, Purdue University, West lafayette, Indiana, United States, 2 Radiology and Imaging Sciences, Indiana University School of Medicine, Indianapolis, Indiana, United States, 3 Siemens Medical Solutions, North Carolina, United States, 4 Department of Radiology, University of Michigan Health System, Michigan, United States, 5 Electromagnetics Division, National Institute of Standards and Technology, Colorado, United States

It is known that gradient non-linearity can introduce an error in the measured ADC when off isocenter application was performed. We measured ADC values at various position offsets in different types of scanners from a single vendor and investigated the possibility of correcting ADC error using gradient field map. The correction produces declining ADC values at X offset (R/L) and an elevated ADC at Z offset (H/F), which are both closer to ADC value at the isocenter. A significantly lower gradient nonlinearity error also be shown in our study for long bore scanner compared to short bore scanner.

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