2D Slice Viewer#

Tables 1 and 2 below show the mouse and keyboard actions which can be used to control the visualization and manipulation of image and segmentation data. Though these functions are general, there are tools which used these functions for specify purposes or may otherwise block a couple of these functions, the most prominent example is the scroll wheel in the paint brush tool is used to change brush size. In this case, you can still scroll through slices by holding Shift. In all cases, an alternative is given in the software. Also presented in this section is a list and description of the icons presented in the 2D slice viewer (Table 3).

Table 1 Mouse Functions in the 2D Viewers#

Mouse Command

Function

left button drag

Modify brightness and contrast. Vertical is contrast, horizontal is brightness.

scroll up/down

Move up/down a slice. Note: using Shift maybe needed while using some tools (like paint brush)

CMD/CTRL+right button

Move slices in other planes to intersect at cursor. Viewers must have the picking icon enabled.

Shift+left button drag

Pan view

Shift+right button drag

Zoom view in/out
Table 2 Keyboard Actions in the 2D Viewers#

Keyboard Action

Function

up arrow, >

Move up one slice

down arrow, <

Move down one slice

Shift+up arrow, Shift+>

Jump up n slices (set n in preferences)

Shift+down arrow, Shift+<

Jump down n slices (set n in preferences)

left/right arrow

Change active layer to previous/next layer

SPACE

Toggle layer visibility on/off (active layer)

G

Toggle grid visibility

P

Toggle picking state

T

Toggle overlay visibility

L

Toggle lock viewer (to other locked views of the same type)
Table 3 Icons and Actions in the 2D Viewers#

Icon

Function
../../../../../_images/AutoViewOff.png

Autoview Icon: This icon forces the panel to fit the objects in viewer with maximum size.
../../../../../_images/LockOff.png

Lock View Icon: This icon toggles the viewer lock on the panel (shortcut: L). Any changes to any locked viewers will change all the views. Viewers must be the same type and each must be locked to use this function.
../../../../../_images/VisibleOff.png

Visibility Icon: This icon toggles the visibility of the plane in the 3D volume viewer.
../../../../../_images/PickingOff.png

Picking Icon: This icon toggles the ability of other planes to pick the slice to view in the panel. Only one viewer can have this option enabled. If there is only one type of plane, this cannot be disabled.
../../../../../_images/GridOff.png

Grid Icon: This icon toggles the visibility of the grid in the viewer
../../../../../_images/FlipHorizOff.png

Flip Horizontal Icon: This icon will horizontally flip the visualization of the slices in the viewer.
../../../../../_images/FlipVertOff.png

Flip Vertical Icon: This icon will vertically flip the visualization of the slices in the viewer.
../../../../../_images/OverlayOff.png

Overlay Icon: This icon will toggle the visibility of the overlay on the viewer. This will allow unobstructed viewing of the slices.
../../../../../_images/PickingLinesOff.png

Picking Lines Icon: This icon toggles the visibility of the picking lines (shows other slices) in the viewing panel.