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#### Measuring the pixel intensity of a point

You can measure the pixel intensity of a point on an image, to determine the tissue type of a very small region of interest (ROI). See Use of the pixel intensity values. The measurement is exclusively used in CT studies.

Restriction for measuring the pixel intensity of a point

The pixel intensity value is provided for your information only, and is not added to the diagnostic image as a persistent annotation.

Step 1: Select the Point Analysis tool

To select the tool:

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

| 2. | Click the Point Analysis tool on the Annotation Control Panel.

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

Step 2: Adjust the Point Analysis tool properties (if necessary)

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

To adjust the tool properties:

| 1. | Click the Color box, and specify the color of the annotation.

| 2. | Click the Font size box, and specify the font size of the measurement.

Step 3: Measure the pixel intensity

To measure the pixel intensity of a point:

| • | Click the image where you want to measure the intensity.

The pixel intensity value of the point of interest is displayed, in Hounsfield Units (HU) or Optical Density (OD).

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