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Source volume: Choose the volume to segment. The source volume that is selected the very first time after the segmentation is created is used to determine the segmentation’s labelmap representation geometry (extent, resolution, axis directions, origin). The source volume is used by all editor effects that uses intensity of the segmented volume (e.g., thresholding, level tracing). The source volume can be changed at any time during the segmentation process. Note: changing the source volume does not affect the segmentation’s labelmap representation geometry. To make changes to the geometry (make the extent larger, the resolution finer, etc.) click Specify geometry button next to the source volume selector, select a “Source geometry” node that will be used as a basis for the new geometry, adjust parameters, and click OK. To specify an arbitrary extens, an ROI (region of interest) node can be created and selected as source geometry. If the new geometry will crop a region from the existing segments, a warning icon will be displayed beside the “Pad output” checkbox. If the “Pad output” is checked, the extent will be expanded so that it contains both the existing segments and the new reference geometry.
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