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eNcounter®: Measurement Calibrations

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eNcounter

Measurement Calibrations

This article explains how to calibrate camera measurements withing the eNcounter platform.

 

eNcounter allows users to create a Measurement Calibration that determines the measurement value for each pixel of the displayed image when using the measurement label feature.This means the images taken with the camera should be taken at the same distance from the patient that was used when creating the calibration. For example, the real-world distance of a line drawn using the measurement label feature will represent a much smaller value when the exam camera is held 1 inch away from the patient compared to 1 foot.

Creating a Measurement Calibration

  1. Determine which unit of measure (mm, cm, inches) will be used.
  2. Position the exam camera to display a ruler or other measuring device that uses the desired units. It is highly recommended that a calibration is created for each camera attachment to ensure an accurate measurement when using the camera. Using an attachment when creating a calibration will guarantee a consistent focal length between the area of interest and the camera lens.

Critical Note: Variations in the focal length used when creating calibrations and taking an image will cause inconsistencies in measurements.

  1. Press the FF button on the exam camera to freeze an image of the ruler. Note: When using the TotalExam 3 to create a Measurement Calibration, the Auto-Focus head must be installed on the device. See the TotalExam 3 Camera Articles for more information about removing and installing camera attachments.
  2. Select the Calibration icon on the imaging toolbar and select New Calibration.
  3. Click and drag the cursor in the viewing pane to draw a line that represents one unit of measure.

  1. The user must enter a name and a representative value for the drawn calibration line. Then select the desired unit of measure and click OK.

Note: eNcounter allows the user to create up to 10 unique calibrations and each new calibration must be named. The application defaults to the last calibration used.

  1. Selecting a Pre-Existing Measurement Calibration
  2. Select the Calibration icon on the label toolbar and select Choose Calibration.
  3. Select the desired calibration from the list and click OK.