“X-ray” Bones Radiology Tube Photon Humerus Pelvis Inlet Outlet “Scotty Dog” “Hold your breath” “Breath” PSU Penn State Sternum “Posterior Oblique” Ribs Clavicle mAs kVp Intensity “Air Kerma” Roetngen Exposure SID OID Scotty Dog Collimation Lateral PA AP Decubitus Bucky Image Receptors Anode Cathode Filament Rheostat Autotransformer “Photoelectric effect” mGy Sieverts Axial Portable Lead Tungsten Molybdenum Graphite