Final answer:
The Stecher method is used for collimation in PA axial projection of the wrist.
Step-by-step explanation:
Method used for collimation in PA axial projection of the wrist
In the PA axial projection of the wrist, the Stecher method is used for collimation. This method involves directing the X-ray beam at a 25-degree angle from the horizontal plane towards the ulnar styloid process. The beam should be centered on the mid-carpal area. This helps visualize the carpal bones in the PA axial view.