5.5. Working with Orthogonal Planes

5.5.1 View Modes

Click the Switch navigation mode button and select one of the three view modes:

1. The 3D cursor mode. It allows you to drag and rotate orthogonal cutting planes using the mouse. The Switch navigation mode button will look as follows: .

2. The on click 3D cursor mode. It allows you to move orthogonal cutting planes similarly to the 3D cursor mode, but the plane lines are visible only during the dragging (while the left mouse button is pressed). The Switch navigation mode button will look as follows: .

3. The planes cursor mode. The cutting planes are displayed permanently. Their moving is described in the next section. The rotation of planes is similar to the 3D cursor mode and is described in Section 5.5.2. The Switch navigation mode button will look as follows: .

In all the view modes the current plane can be moved in several ways:

• scroll the mouse wheel. If you scroll the wheel forward, the plane will withdraw, if you scroll it backward, the plane will move nearer. One click of the mouse wheel changes the plane position by the distance equal to the thickness of the slice from the initial series;

• by use the scrollbar on the right side of the section view window to move the section;

• use the Scrolling tool. Activate the tool on the toolbar by clicking the left/right/middle mouse button and move the cursor up to withdraw the plane or down to move it nearer, holding down the button with which the tool was activated. To learn more about tool control, see Section 1.14.

5.5.2 Working with Planes in 3D Cursor Mode

To move orthogonal planes, click the left mouse button at the point you want to move the planes to, or move the mouse, holding the left button. When the button is released, the position of the planes is fixed. To rotate a plane while maintaining orthogonality:

1. Locate the cursor on the radial bidirectional arrow on the plane line (see red arrows in Fig. 5.6). The bidirectional arrow will be highlighted.

2. Move the cursor, holding the left mouse button to rotate the plane by the required angle. The images on the other planes will change.

3. Release the left mouse button to fix the current position of the plane.

To rotate a plane without maintaining orthogonality, follow the steps above, holding the Shift key while performing the step 2.

To undo the rotation of all planes, click the Undo rotation button on the toolbar .

Note that all the other view changes will be undone as well.

5.5.3 Working with Planes in the Cutting Plane Mode

The DICOM Viewer allows you to move planes one by one in the image view modes. To do this:

1. Locate the cursor on the plane line to highlight it.

2. Move the line, holding the left mouse button.

Scroll the images in some window to see how the target plane is moving in the other windows.

For convenience, zoom the image in and out by rolling the mouse wheel, holding the Ctrl key (or the Command key for macOS).

There are two ways to move images in the window for viewing cutting planes:

1. Move the mouse holding the wheel and the "Shift" key on the keyboard. This key combination is set by default. You can disable or change the setting in the Controllers tab of the Image viewer module (see Section 16.7.1).

2. Activate the Pan tool on the toolbar by clicking the left/right/middle mouse button. To continue work with this tool, use the button with which the tool was activated.To learn more about tool control, see Section 1.14. To move an image, move the cursor around the screen while holding down the mouse button.

This tool is also available from the image context menu and from the MPR main menu item.