Skip to main content
. 2020 Dec 16;3(1):e190199. doi: 10.1148/ryai.2020190199

Figure 2:

Effect of normalization on the region of interest (ROI) intensity histograms. Intensity histograms of the ROI segmentations from the scan (blue) and rescan (orange) of representative cases on both T2-weighted fluid-attenuated inversion recovery (T2W-FLAIR) and T1-weighted (T1W) postcontrast sequences of, A, a representative case and, C, a failure case. The first column shows ROI intensity histograms without preprocessing; the second column, after brain extraction and normalization via histogram matching; and the third column, after brain extraction and z score normalization. The overlap between the histograms is quantified by Jensen-Shannon divergence (JSD). B, D, Axial sections from the T2-weighted FLAIR and T1-weighted postcontrast scan and rescan after brain extraction of the corresponding cases, A, C, respectively.

Effect of normalization on the region of interest (ROI) intensity histograms. Intensity histograms of the ROI segmentations from the scan (blue) and rescan (orange) of representative cases on both T2-weighted fluid-attenuated inversion recovery (T2W-FLAIR) and T1-weighted (T1W) postcontrast sequences of, A, a representative case and, C, a failure case. The first column shows ROI intensity histograms without preprocessing; the second column, after brain extraction and normalization via histogram matching; and the third column, after brain extraction and z score normalization. The overlap between the histograms is quantified by Jensen-Shannon divergence (JSD). B, D, Axial sections from the T2-weighted FLAIR and T1-weighted postcontrast scan and rescan after brain extraction of the corresponding cases, A, C, respectively.