vdview Boundary marking

This section will show you how to mark the boundary of a 3D region of interest (ROI) in an image. You will need to mark the boundary of the ROI for each image containing the ROI. The tools for the boundary tools are in the Boundary section of the control panel.

Creating a Boundary
Select a slice that contains the ROI and make sure that the focal point is on the ROI. The following procedure is used to create a ROI boundary from scratch.

1. Zoom In until the ROI fills most of the image area.
2. Select Edit Bnd in the topmost Boundary drop-down menu or press the Edit button in the Edit Commands section of the Annotation area. The drop-down menu should be surrounded now by a red border, indicating that it is the active tool.
3. Place the cursor on the boundary of the ROI.
4. Click the mouse button to start a new boundary on this image. The first point of a boundary appears in a different shade than all the other points (and behaves differently when the boundary is closed and it gets deleted)
5. Append points to the boundary by clicking around the ROI (taking care that no already drawn segment gets highlighted). With each click, a new point will be appended to the boundary after the last point.
6. Click on the starting point to close the boundary.
7. At any time, you can undo the last action or go back and edit the existing points.

Editing a Boundary

There are two ways to edit the points of the boundary. The first method is to use the Edit Bnd (Edit Boundary) tool.

1. Select Edit Bnd from the drop-down Boundary menu or press the Edit button in the Edit Commands section of the Annotation area.
2. To move a point, click on a point and drag it to the new location.
3. To insert a point, place the cursor over or near a line to get it highlighted. Press the mouse button to insert a new point. Before releasing the mouse button, you can drag the point to the desired location.
4. To remove a point, place the mouse over a point. The selected point will become highlighted. Double click the mouse button to remove the selected point. Alternatively, you may single click while holding down the Ctrl key. There is one exception; if you delete the first point of a closed boundary, the boundary will turn open instead of removing its first point.
5. To start a new boundary, hold down the Shift key while clicking the mouse on the location of the new boundary.
6. If you make a mistake, click on the Undo button to reverse the most recent changes.

1. Select Nudge Bnd (Nudge Boundary) from the Boundary drop-down menu.
2. Move the cursor over the drawn boundary. There will be a circle around the cursor and any points within the circle will become highlighted.
3. Place the cursor so that a few highlighted points are near the edge of the circle.
4. Click the mouse button, and the points will be moved to the edge of the circle.
5. Press the mouse button and drag the mouse, and the points will be pushed along the edge of the circle.
6. To resize the nudging circle, hold the Shift key and drag the mouse until the circle is the desired size.
7. Hold the Ctrl key and drag the mouse to set the "Arc" nudger. This is an arc of a circle that can push points to the edge of the arc.
8. Click and drag the mouse to nudge points (same as the circular nudger).

Save the Region Boundary

To save the ROI boundary to the server, press the Save As button in the Annotation Commands section of the Annotation area. You will be asked to set the annotation title and to click again the Save As button until the boundary is saved.

It is possible to store additional comments about the ROI or ROI boundary by writing them in the comments section of the Annotation area.

If changes are made to a boundary or to its comments field, the boundary can be saved again by pressing the Save button.