2.26. Graphic Label Tool

2.26.1 General

This tool allows you to create graphic labels (as arrows, ellipses, polygons and text fields) on an image. The labels will be applied during the entire session of working with the series. The labels are attached to specific points on the image and panned, scaled or rotated together with the image.

2.26.2 Create Labels

To create a label on an image:

1. Activate the Pointer tool by clicking the left/right/middle mouse button. The button will look as follows: . 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.
2. Click the mouse button at the location the arrow should point to.
3. Click the mouse where the opposite end of the arrow should be. The pointer will be displayed (Fig. 2.37.
4. To cancel an incomplete creation, press Esc.

1. Activate the Text tool by clicking the left/right/middle mouse button. The button will look as follows: . 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.
2. Click the mouse button where the text should be located.
3. Enter text in the dialog box and click OK to add it to the image or Cancel to cancel the action.

To create a polygon on an image:

1. Activate the Polygon tool by clicking the left/right/middle mouse button. The button will look as follows: . 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.
2. Click the mouse button where the first point of the polygon should be located.
3. Move the cursor to the location of the next point. The lines connecting the points of the polygon will be displayed on the screen.
4. Click the mouse button to save the point.
5. Repeat Steps 3 and 4 until the last but one point is set.
6. Double-click the mouse to create the last point. The polygon is complete (Fig. 2.38).
7. To cancel an incomplete creation, press Esc.

1. Activate the Ellipse tool by clicking the left/right/middle mouse button. The button will look as follows: . 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.
2. To build an ellipse, just build the rectangle the ellipse is inscribed into. Click the mouse button where the first angle of the rectangle should be located.
3. Move the cursor to the location of the opposite angle. The ellipse will be displayed on the screen.
4. Click the mouse button to fix the opposite angle. The ellipse is complete (Fig. 2.39).
5. To cancel an incomplete creation, press Esc.

2.26.3 Actions with Labels

The DICOM Viewer allows you to perform the following actions with labels:

• Drag. Locate the cursor on the figure line or text and drag the object, holding down the left mouse button or the button to which this tool is assigned.
• Drag a point (an apex for an arrow or polygon and a rectangle apex for an ellipse). Locate the cursor on a point and drag the point, holding down the left mouse button or the button to which this tool is assigned.
• Delete. Locate the cursor on the label border, right-click the mouse and select the Remove object item from the context menu.
• Set render params. Locate the cursor on the label border, right-click the mouse and select the Set render params item from the context menu. In the dialog box that appears, set the line color and thickness for a figure or the font color and size for text. Click OK to apply the changes or Cancel to cancel the actions.
• Edit text label. Locate the cursor on the text, right-click the mouse, and select the Edit text command from the context menu.

To set the default render parameters, click on the right side of the button and select the command Set default annotation render params.

To delete all objects, click the Delete all Annotations and Measurements button or select the corresponding item from the image context menu. In the dialog box that appears, Click Yes to delete or No to cancel. If you want the DICOM Viewer to always delete annotations and measurements without this confirmation, check the box Don‘t show this dialog again and click Yes. If you want the DICOM Viewer to show the confirmation dialog, check the box Ask before deleting all annotations and measurements (see Section 14.5.1). Attention! All measurements and other objects created manually will be deleted.