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Anisha Keshavan added The_paper_cited_here_adds__.tex
over 8 years ago
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The paper cited here adds evidence for our hypothesis that different ROIs will have different scaling factors, due to regional differences in contrast, as shown in a VBM analysis by Tardiff and colleagues. I have edited this section:
\textit{"We hypothesized that all differences in \textbf{regional} contrast and geometric distortion result in regional volumes that are consistently and linearly scaled from their true value. For a given region of interest (ROI), two mechanisms impact the final boundary definition: gradient nonlinearities cause distortion and, simultaneously, hardware (including scanner, field strength, and coils), and acquisition parameters modulate tissue contrast, adjusting the whole boundary. \textbf{Previously, Tardiff and colleagues have found that contrast-to-noise ratio and contrast inhomogeneity from various pulse sequences and scanner strengths cause regional biases in VBM\cite{tardif2010regional,tardif2009sensitivity}, and therefore we hypothesized that each ROI will scale differently at each site.} By imaging 12 subjects in 20 different scanners using varying acquisition schemes, we were able to estimate the scaling factor for each regional volume at each site..."}