Using the Probe Tools

You can view the values and coordinates of the voxel, or selected 2D neighborhood, under the mouse cursor with the tools on the Probe panel. You should note that multiple values will be displayed for views that contain multiple objects, such as image data and multi-ROIs with scalar values.

Probe panel

Values that appear in gray text indicate that the probed voxel(s) is not visible in the view, but still intersects with a visible voxel. For example, in the case that two datasets are added to a view, but some voxels of one the datasets are not visible.

The following Probe tools are available on the panel.

Probe tools
	Description
	Point Probe… Reports the position and value(s) of the selected voxel in the current 2D view or 3D view.
	Disk Probe… Reports the position and values of the selected circular neighborhood that is aligned with the current 2D view.
	Square Probe… Reports the position and values of the selected square neighborhood that is aligned with the current 2D view.
	Sphere Probe… Reports the position and values of the selected spherical neighborhood that is aligned with the current 2D view.
	Cube Probe… Reports the position and values of the selected cubic neighborhood that is aligned with the current 2D view.

The following measurements are available for probed points and neighborhoods.

Probe measurements
	Description
Position	Indicates the X, Y, and Z positions of the selected point or the center of the selected neighborhood in the world coordinate system. Note When probing neighborhoods, the diameter of the selected Disk or Sphere probe or the side measurement of the selected Square or Cube probe, will also be indicated.
For datasets	Value… Indicates the intensity value of the selected voxel or the value of the voxel in the center of the selected neighborhood. Voxel… Indicates the X, Y, and Z positions of the selected point or the center of the selected neighborhood in the image coordinate system. *Voxel count… Indicates the number of voxels in the probed neighborhood. Mean…* Indicates the mean value of the voxels in the probed neighborhood. *Min… Indicates the minimum value of the voxels in the probed neighborhood. Max…* Indicates the maximum value of the voxels in the probed neighborhood. *Standard Deviation…** Indicates the standard deviation of the voxel values in the probed neighborhood.
For ROIs**	On or not on a voxel… Indicates if the selected point is on a labeled voxel or not on a labeled voxel. Voxel… Indicates the X, Y, and Z positions of the selected point in the image coordinate system.
For multi-ROIs	Label… Indicates the label value of the selected voxel or the value of the voxel in the center of the selected neighborhood. Voxel… Indicates the X, Y, and Z positions of the selected point or the center of the selected neighborhood in the image coordinate system. Scalar values… Indicates the scalar values, such as the area, eccentricity, max Feret, min Feret, or class, that are associated with the selected label.
For meshes***	Face index… Indicates the index value of the selected mesh face. Vertex index… Indicates the index value of the selected mesh vertex. Vertex scalar values… Indicates the scalar values, such as volume, surface area, Phi and Theta angles, or class, associated with the selected vertex index. Available for meshes with scalar values only.
For graphs***	Edge index… Indicates the index value of the selected graph edge. Node index… Indicates the index value of the selected graph node. Edge scalar values… Indicates the scalar values, such as length, associated with the selected edge index. Node scalar values… Indicates the scalar values, such as segment length, segment Euclidean length, and pore diameter, associated with the selected vertex index.

* Available for the Disk, Square, Sphere, and Cube probe tools only.
** Available for the Point Probe tool only.
*** Meshes and graphs can only be probed in 3D views.

How to Probe Values

Add the required dataset(s) to the current scene and adjust the view, as required.
Open the Probe panel on the left sidebar.
Select the required Probe tool.
Adjust the size of the probe, as required.
- Hold-down Left Ctrl and rotate the scroll wheel of your mouse to adjust the diameter or size of the probe.
- Enter the required size in the Diameter edit box.
Click inside a 2D or 3D view to see the value(s) and coordinates of the selected voxel or neighborhood.
Note If you are probing an area, the center of the probe must intersect with the data. In cases in which you probe values at the edge of an object, only voxels that contain data will be considered when computing the related statistics.

Configured Actions for the Probe Tools

A number of configured actions and keyboard shortcuts are available for using the Probe tools. The default settings for these actions are listed in the following table.

Default configured actions for the Probe tools
Action	Key	Mouse
Increase Cube Probe size (in Probe)	Left Ctrl	Mouse wheel up
Decrease Cube Probe size (in Probe)	Left Ctrl	Mouse wheel down
Increase Disk Probe size (in Probe)	Left Ctrl	Mouse wheel up
Decrease Disk Probe size (in Probe)	Left Ctrl	Mouse wheel down
Increase Spherical Probe size (in Probe)	Left Ctrl	Mouse wheel up
Decrease Spherical Probe size (in Probe)	Left Ctrl	Mouse wheel down
Increase Square Probe size (in Probe)	Left Ctrl	Mouse wheel up
Decrease Square Probe size (in Probe)	Left Ctrl	Mouse wheel down
Activate the Probe	-	Left mouse
Activate the Probe Cube	-	Left mouse
Activate the Probe Disk	-	Left mouse
Activate the Probe Spherical	-	Left mouse
Activate the Probe Square	-	Left mouse
Probe in any mode	O	-
Probe Cube in any mode	-	-
Probe Disk in any mode	-	-
Probe Sphere in any mode	-	-
Probe Square in any mode	-	-
Switch to Probe mode	P	-
Switch to Probe Cube mode	-	-
Switch to Probe Disk mode	-	-
Switch to Probe Spherical mode	-	-
Switch to Probe Square mode	-	-

See Configurable Actions for information about modifying default actions.