Use the tools on the Calibrate section of the main SmartCeph ribbon bar.
Calibration is the process of relating the image on the screen to a standard measurement such as millimeters or inches in order to make accurate measurements. If you have configured SmartCeph to calibrate using millimeters, you will be prompted to calibrate at the beginning of each trace. Otherwise, the measurements are calculated according to your DPI device settings.
Generally, calibration is performed when you first trace a ceph and recalibration is not necessary. If, however, recalibration of the ceph or the facial photo is needed, you can use the Calibration tools to realign the images.
Use the tools on the Calibrate section of the main SmartCeph ribbon bar.
Recalibrate ceph - Click 
Ceph. You will be prompted to click two calibration points to indicate the measurement ratio to use. We suggest you always include a metric ruler on your X-Rays for this purpose. If you recalibrate, we recommend you also consider re-tracing the ceph entirely.
Recalibrate photo - If the facial photo does not line up with the ceph correctly, click 
Facial. You will be prompted to identify the Pronasale and Labial Sulcus . This is particularly useful if the lateral facial photo was not present when the ceph was originally traced.
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