When using a panel unit with doors such as the one shown, smaller patients can avoid overlap by angling the doors inward during the first exposure and then opening them completely when doing the back. If you are a “larger” patient, you should angle the doors inward for both the front and back rotation.
Another hint: If you use timed treatments, alternate which side of the body you treat first. Front first one day, back first the next treatment. As lamps warm up their power increases then levels off. By alternating sides consistent doses are given to both sides of your body. If you have integrating dosimetry, don’t worry about this.