Pin and ark
Description
Instead of having to manually move the patient the pin and ark could be positioned at the head of the bed to measure the treatment angle needed. It gave information on the patients’ size and treatment plan. Instead of guessing what the angle was, practitioners could put this above the patient to measure and determine the angle - then the machine would rotate - moving the treatment bed to meet it. These were phased out in the mid-1970s when treatment machines came when laser and light beams that gave a graduation scale and showed an image of the patient. You get all these measurements more elegantly these days with lasers rather than physically measuring angles. It was fazed out in the 1970s.
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