Introduction
There was a recent post on the MedPhys Listserv which asked if it was possible to use a laser range finder to verify/measure the couch roll. It is simple trigonometry after all. One needs to know two sides of the right triangle and then calculate the angle. With a range finder, the two sides of the triangle are the adjacent and hypotenuse. \(cos ^{-1}(\theta) \) then gives the couch roll. I don’t have a range finder, but I do have a laser level. So, I gave it a try.
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