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- retvinklethed mellem røntgenstråling og billedmedie vinklen mellem røntgenstrålingens centerakse og billedplanet bør højst afvige 1,5 grad fra 90 grader.
- orthogonality of x-ray beam and image receptor the angle between the central axis of the x-ray beam and the plane of the image receptor should not differ by more than 1.5 degrees from 90 degrees.