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#### List of the annotation tools

The following table describes the annotation tools in Disc. To use the annotation tools to create annotations, see Annotating images and Measuring images.

Tool | Functionality
Distance | Draw a line and measure the distance between the endpoints.
Simple Angle | Draw and measure an angle in degrees.
Cobb Angle | Draw and measure a Cobb angle. This tool is used to measure spinal scoliosis.
Elliptical ROI | Define an Elliptical Region of Interest (ROI), and measure its pixel intensity parameters, area, and perimeter. Elliptical ROI is exclusively used in CT studies.
Point Analysis | Measure the pixel intensity of a point. This tool is exclusively used in CT studies.
Arrow | Place arrows on an image.
Text | Place comments on an image.
Spine Labeling | Add vertebrae and disk labels. This tool is used in one of the following ways:
| • | Label the sagittal or coronal view of MR spine study when scrolling through axial images
| • | Label the axial images if the sagittal or coronal view are not available or being viewed simultaneously
Ellipse | Place ellipses on an image.
Cover | Mask an image, by covering an area of the image with a rectangle.
Calibrate | Define the measurement scale.
Eraser | Delete an annotation.
Delete All | Delete all annotations from a single image, selected images, or all images in the series.

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