Karl G. Helmer1, Ming-Chung Chou2, Ronny I. Preciado, Allen Song3, Jessica Turner4, Barjor Gimi5, Susumu Mori6, 7
1Radiology, Massachusetts General Hospital, Charlestown, MA, United States; 2Department of Medical Imaging and Radiological Sciences, Kaohsiung Medical University, Kaohsiung, Taiwan; 3Radiology, Duke University, Durham, NC, United States; 4Translational Neuroscience, The Mind Research Network, Albuquerque, NM, United States; 5Radiology and Medicine, Dartmouth-Hitchcock Medical Center, Lebanon, NH, United States; 6Radiology, Johns Hopkins School of Medicine, Baltimore, MD, United States; 7Kennedy Kreiger Institute, Baltimore, MD, United States
We report on a method using histogram-similarity measures to establish normative data which can be used in the calibration of diffusion-weighted imaging data collected at a single or multiple sites. This method can be used to quantitatively determine the quality of new data acquired over time by comparing it to the normative data. We have calculated histogram similarity using different metric types, both within and between sites and have shown that these metrics are sensitive measures for both fractional anisotropy (FA) and mean diffusivity (MD). Statistical significance of the results was determined using simulations of two different histogram distributions.