Annotations and Measurements

The SmartPACS Viewer includes many measurement tools and annotations that can be added to the image. Pressing the Measurement Tool will open a drop down menu with all the Measurement and Annotation tools.

Calibration#

Measurements of an image will use the DICOM Tag Imager Pixel Spacing (0018,1164) for the DX family of DICOM Images or Nominal Scanned Pixel Spacing (0018,2010) for the Multi-frame SC family of DICOM Images to calculate the measurements. If these tags are absent, measurements will be measured in Pixels.

SmartPACS provides Calibration tools to calibrate an image. The Calibration Group is where you can find the Calibration By Units and the Calibration by Percentage Tools.

Calibration Group
caution

Calibrating an image will require the removal of all unsaved existing annotations. If annotations are present you will see a Warning.

Calibration Warning

Pressing the OK button will remove all the existing annotations from the image. Pressing the Cancel button will close the warning without removing the existing annotations.

Calibration By Units#

Calibration By Units Icon

This tool allows you to define the scale of an image by measuring an object of known length in the image. This is an interactive tool. While active, press on the image on one side of the object to measured. Drag the cursor to the other end of the object and release. The Calibration Dialog will be displayed.

Calibration Dialog

Enter in the length of the object in centimeters and press the OK button. Pressing the Cancel button will abort the calibration.

Calibration By Percentage#

Calibration By Percentage Icon

This tool allows you to scale the measurements by a specific percentage. Selecting this tool will open the Calibration Dialog.

Calibration Dialog Percent

Enter a percentage to scale by and press the OK button to apply it. Pressing the Cancel button will close the dialog and not apply the scaling.

Measurement Group#

The Measurement Group contains all the tools to create Measurements and Annotations. This group contains more tools than can be displayed in the drop down menu at one time. You can scroll down the list to see the rest.

Measurement Group

Linear Measurement#

Linear Measurement Icon

This tool will create a Linear Measurement annotation between two points and calculate the distance. This is an interactive tool. When active, you can press on the image where you would like to start the measurement. Drag the cursor to the point you would like to end the measurement and release. You can continue to add as many Linear Measurements as you like while the tool is active.

Linear Measurement

While editing annotations, you can use the Red Grab Points at the ends of the line to move the end points. The Purple Grab Point will move the whole annotation. The Red Grab Point next to the measurement text can be used to reposition the measurement text.

Arrow#

Arrow Annotation Icon

This tool allows you to add an Arrow annotation to the image. This is an interactive tool. When active, you can press on the image where you would like the arrow to point from. Drag the cursor to the point you would like the arrow to point to. You can continue to add as many arrows as you like while the tool is active.

ArrowAnnotation

While editing annotations, you can use the Red Grab Points at the ends of the arrow to move the end points. The Purple Grab Point will move the whole annotation.

Angle#

Angle Measurement Icon

The Angle Measurement Tool allows you to measure the angle made between two lines. This is an interactive tool. When active, you can press on the image where you would like to start the first leg of the measurement. Drag the cursor to the point where the vertex of the measurement should be and release. Press the vertex point again to start drawing the second leg of the measurement. Drag the cursor to the point where the second leg should end and release. The system will measure the angle made between the two legs at the vertex. The minimum angle the system can measure is 0Ā°. The maximum is 180Ā°. You can continue to add as many Angle Measurements as you like while the tool is active.

Angle Measurement

While editing annotations, you can use the Red Grab Points at the ends of the Legs or the Vertex of the Annotation to move them. The Purple Grab Points will move the whole Leg annotation leaving the other end point stationary. The Red Grab Point next to the measurement text can be used to reposition the measurement text.

Cobb Angle#

Cobb Angle Icon

The Cobb Angle tools allows you to measure the angle made between two lines. This is an interactive tool. When active, you can press on the image where the first line should start. Drag the cursor to the point where the first line should end and release. Press on the Image where the second line should start. Drag the cursor to the point where the second line should end and release. The system will calculate the both angles made by the two lines. You can continue to add as many Cobb Angle Measurements as you like while the tool is active.

Cobb Angle

When editing annotations, you can use the Red Grab Points at the end of the lines to move the ends of the Lines. The Purple Grab Points will move the whole line. Use the Red Grab Points next to the Angle Measurements to move the text. If the measurement label is moved it will recalculate the angle based on where the label is positioned in relation to the lines.

Vertebral Heart Score#

Vertebral Heart Score Icon

The Vertebral Heart Score tool will start a walk-through that will guide you in drawing the correct lines to measure the Vertebral Heart Score. Read more about it here.

Norberg-Winkel / Hip Dysplasia Measurement#

Norberg-Winkel Icon

The Norberg-Winkel Tool will start a walk-though that will guide you in drawing the correct annotations for a Norberg-Winkel / Hip Dysplasia Measurement. Read more about it here.

Circle#

Circle Measurement Icon

The Circle Measurement will allow you to measure the radius and area of a circular region. This is an interactive tool. When active, to draw the region, press the image where the center of the circle should be. Drag the cursor away from the center until the circle is at the appropriate size. The system will calculate the Radius and Area of the region. In addition, it will calculate the Average Pixel intensity in the region and the Standard Deviation of those values.

Circle Measurement

When editing annotations, you can use the Red Grab Point on the circumference of the circle to resize the circle. The Purple Grab point will move the whole annotation. Use the Red Grab Points next to the Measurements to move the text.

Ellipse#

Ellipse Measurement Icon

The Ellipse Measurement will allow you to measure the area of an elliptical region. This is an interactive tool. When active, to draw the region, press the image where the center of the ellipse should be. Drag the cursor away from the center until the ellipse is at the appropriate size. Dragging vertically will change the ellipses height. Dragging horizontally will change the ellipses width. The system will calculate the Area of the region. In addition, it will calculate the Average Pixel intensity in the region and the Standard Deviation of those values.

Ellipse Measurement

When editing annotations, you can use the Red Grab Point to resize the ellipse. The Purple Grab point will move the whole annotation. Use the Red Grab Points next to the Measurements to move the text.

Three Point Circle#

Three Point Circle Measurement Icon

The Three Point Circle Measurement will allow you to measure the radius and area of a circular region. This is an interactive tool. When active, to draw the region, select three points along the perimeter of the circle. The system will calculate the Radius and Area of the region. In addition, it will calculate the Average Pixel intensity in the region and the Standard Deviation of those values.

Three Point Circle Measurement

When editing annotations, you can use the Red Grab Points on the perimeter of the circle to adjust the size of the circle. The Purple Grab point can be used to move the whole Annotation. Use the Red Grab Points next to the Measurements to move the text..

Area#

Area Measurement Icon

The Area Measurement Tool will allow you to measure the area of an irregular region. This is an interactive tool. When active, press on the image where you would like to start the region. Drag the cursor, tracing out the region. When you have finished tracing out the region, release. The system will calculate the area of the region. In addition, it will calculate the Average Pixel intensity in the region and the Standard Deviation of those values.

Area Measurement

When editing annotations, the Purple Grab point can be used to move the whole Annotation. Use the Red Grab Points next to the Measurements to move the text.

Text#

Text Annotation Icon

The Text Annotation Tool allows you to add Text to the image. This is an interactive tool. When active, press on the image where you would like the annotation to appear. The Text Annotation Dialog will appear.

Text Annotation Dialog

Enter the Text you want to display on the image and press the OK button and the dialog will close and the annotation will be placed on the Image. Pressing the Cancel button will close the dialog and no annotation will be placed.

Text Annotation

When editing annotations, you can change the text of a Text Annotation by pressing on the Annotation. This will open up the Text Annotation Dialog where you can change the text. Pressing the OK button will update the text of the Annotation. Pressing the Cancel Button will close the Dialog and not change the Text.

Hide / Show Annotations#

Hide Annotations Icon

This tool will toggle the display of annotations and measurements. Selecting this tool will make all the annotations and measurements on the image invisible. When Annotations have been hidden, the Annotation and Measurement Tools will be disabled and the Hide Annotation Icon will change to the Show Annotation Icon.

Show Annotations Icon

Pressing the Show Annotation Icon will show all the Annotations and Measurements.

Edit Annotations#

Edit Annotations Icon

To edit an existing annotation, press the Edit Annotation Icon. This is an interactive tool. While active, you can manipulate annotations you have previously placed on the image. When the cursor gets close enough to one of the annotations grab points, it will turn orange. Purple grab points will move the entire annotation. Red grab points will move just that point. For text annotations, a single press will open the Text Annotation Dialog to allow you to edit the Text.

Editing Annotations
tip

You can adjust the sensitivity of the Grab Points to your cursor. Read more here.

tip

For fast access to this tool, you can use the keyboard Shortcut. By default, this tool is assigned to the e key. You can read more about assigning or customizing keyboard Shortcuts here.

Erase Single Annotation#

Delete Annotation Icon

To Delete a specific annotation, use the Delete Annotation Tool. This is an interactive tool. While active, press on the Annotation you wish to remove from the image. When you hover over an annotation's grab points, the annotation will be highlighted red. This helps to indicate which annotation will be deleted.

Deleting Annotations
tip

You can adjust the sensitivity of the Grab Points to your cursor. Read more here.

Delete All Annotations#

Delete All Annotations Icon

To Delete all the annotations on an image, use the Delete All Annotations Tool. Pressing this tool will delete all the annotations on the image.