Meeting Banner
Abstract #1861

Effect of DWI sequence on geometric measurement errors in a breast phantom

Lisa J Wilmes1, Adele P Peskin2, Xinran Zhong3, David C Newitt1, Kyung Sung3, Nola M Hylton1, and Kathryn E Keenan2

1University of California San Francisco, San Francisco, CA, United States, 2National Institute of Standards and Technology, Boulder, CO, United States, 3University of California Los Angeles, Los Angeles, CA, United States

Previously, when using the UCSF/NIST breast phantom, we discovered an x-direction distortion in DW-EPI and the resulting ADC maps that was dependent on spatial location within the scanner and was also present in patient images. The distortion was unaffected by switching the phase encode direction and did not change with increasing b-value, and thus was most likely not due to gradient nonlinearity nor eddy currents. Here, we demonstrate that the distortions decrease when using multi-shot EPI, which is less sensitive to off-resonance distortion, and change direction when reversing the gradient polarity.

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

Join Here