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#### Adding and measuring Cobb angles

A Cobb angle is the angle between two non-intersecting lines. Cobb angles are used to measure spinal scoliosis. They are measured in degrees. To measure an angle between two intersecting lines, see Adding and measuring simple angles.

Step 1: Select the Cobb Angle tool

To select the tool:

| 1. | Click the Annotate icon on the main toolbar.

| 2. | Click the Cobb Angle tool on the Annotation Control Panel.

For other ways to select the tool, see Selecting an annotation tool.

Step 2: Adjust the Cobb Angle tool properties (if necessary)

For an overview of annotation properties, see Setting the annotation properties.

To adjust the tool properties:

| • | Follow steps 1-3 of Step 2: Adjust the Distance tool properties (if necessary).

Step 3: Draw and measure the Cobb angle

To draw and measure a Cobb angle:

| 1. | Draw the first line segment.

| • | Drag the mouse pointer across the image.

| • | Release the mouse button.

| 2. | Draw the second line segment.

A dotted line is displayed, connecting the two lines from the middle point. The Cobb angle measurement is displayed in the middle of the dotted line, rounded off to the nearest integer.

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