Planmeca ProMax 3D Max with ProTouch Technical Manual page 139

Technical manual
After the exposure, the image displays in Planmeca Romexis.
4. Using the Draw and Measure tools, calculate the following metrics:
1. Ball roundness: The difference between the front-most ball's width
and height
2. Rear ball distance: The distance between the centre point of the
front-most ball and the rear ball
3. [X1 - X2]: The difference between the 10-ball distance on the left
(X1) and the 10- ball distance on the right (X2)
5 Panoramic and 3D calibrations
Planmeca ProMax 3D Max 133