What is the tube tilt requirement for AP or PA clavicle imaging?

For AP or PA clavicle imaging, there is typically no tube tilt requirement, which makes the option stating "none" the correct choice. When performing an AP (anteroposterior) or PA (posteroanterior) projection of the clavicle, the x-ray beam is directed perpendicular to the film or detector. This allows for a clear view of the clavicular anatomy without the need for angling the tube.

The other options suggest various degrees of tube tilt, which are not necessary for standard clavicle imaging. An incorrect tilt could lead to distortion of the clavicular images or cause the projection to not accurately represent the anatomic features. Proper technique calls for a direct perpendicular beam for optimal imaging of the clavicle in AP or PA views.