Selecting the correct x-ray tube tilt angle and roof pillar rotation for bedside radiography with combined cranio-caudal and lateral cassette tilt

In bedside radiography it is sometimes necessary to use a combined cranio-caudal and lateral tilt. Setting up the unit so that the central ray of the beam enters perpendicular to the surface of the image receptor is a non-trivial task as well as time consuming. The two graphs presented here constitute a convenient means to select correct setup of the x-ray tube in cases where the cassette has a combined caudo-cranial and lateral tilt.