Multi-ROI Properties and Settings

All multi-ROIs that are available are listed in the top section of the Data Properties and Settings panel.

• Click the Multi-ROI icon at the top of the Data Properties and Settings panel to see the available multi-ROIs. See Filters for information about filtering the listed items.
• Click the Eye icon on the left side of the listed item to show or hide the multi-ROI in the currently selected scene. Click the 3D icon to show or hide the multi-ROI in a 3D view. See Object List for more information about changing the visibility of a multi-ROI, as well as renaming and copying multi-ROIs.
• Select a multi-ROI to view basic information about the multi-ROI and its statistical properties (see Basic Properties, Statistical Properties, and Classes and Scalar Information), as well as to access settings to modify its appearance (see 2D Opacity, , 2D Settings, and Clip).
• Right-click the required multi-ROI to access functions for analyzing connected components and other functions (see Multi-ROI Pop-Up Menu).

The basic properties available for a selected multi-ROI includes its geometry, size, and volume.

* Calculated as pixels*spacing.

The following statistical properties are available for a selected multi-ROI. Scalar values, if calculated or imported, can be viewed in the Scalar information box (see Scalar information) or with the Measurement Inspector (see Using the Measurement Inspector).

The Classes and scalar information box indicates the name of each class in the multi-ROI, the number of labeled voxels, and the color assigned to each class. If available, you can also view scalar information related to each class. You can show or hide any class by toggling the visibility control, as well as set a class as the background. In addition, a Pick tool is available for visually selecting a class in a view.

Classes and scalar information

Note See Multi-ROI Classes and Labels for information about labeling image data with the ROI Painter tools.

Background Class

If this option is enabled, labeled voxels that are removed from any class, as well as unlabeled voxels that are painted, will be added automatically to the set background class. Do the following to set a class as the background for a multi-ROI:

• Name the class that you intend to set as the background, recommended.
• Drag the class to the Background class box and drop it when the “+” appears with your cursor.
• To remove the background class, check the None option.

Options for Selected Classes

Contextual menu items for single selections and multiple-class selections let you fully segment the multi-ROI, as well as clear, delete, and merge classes. You can also extract classes as ROIs for other purposes.

Options for a selected class

Scalar information

Measurements that were previously computed for the selected multi-ROI, imported from a file, or copied from another object, are available in the Scalar information group box, as shown below. Measurements are available in the drop-down menu.

Scalar information box

Scalar information settings and options

		Description
Measurement		Indicates the current measurement that is selected and mapped in the views of the multi-ROI. Scalar information for a multi-ROI can be computed in the Object Analysis dialog (see Analyzing Connected Components). Min… Indicates the minimum value of the currently selected measurement. Max… Indicates the maximum value of the currently selected measurement. You should note that the Label measurement refers to the identifier assigned to each labeled component in the multi-ROI and that the maximum value may not be equal to the label count. For example, if you have merged, split, or deleted objects. The label count is always the total number of labeled components in the multi-ROI.
Histogram		Lets you plot the distribution of a selected measurement and extract basic statistics, such as the minimum, maximum, mean, and standard deviation value of the selected measurement.
Export		Lets you export selected scalar values to a comma-separated values file (*.csv extension).
Import		Lets you import scalar values from a comma-separated values file (*.csv extension).

The options in the 2D settings group box, shown below, let you change the appearance of multi-ROIs in the 2D views of the current scene.

2D settings

If the Show only contour item is checked, the colored highlight will be applied only along the contour of the each object in the selected multi-ROI.

Use the Highlight slider, shown below, to adjust the opacity of the colored highlight applied to labeled voxels in 2D views.

2D opacity

The Highlight and Labeled data sliders in the 3D opacity box, shown below, control how multi-ROIs appear in 3D views. You can also control the opacity of unlabeled voxels with the Global volume opacity slider on the Scene's Views Properties panel.

3D opacity settings

The Clip tool allows you to clip interactively along orthogonal planes in 3D views of the selected multi-ROI (see Clipping).