Paranasal Sinuses
Lateral IR Size: 8x10 LW SID: 40"" Page #'s: 2:370,316	Positioning:   • True Lateral with affected side to IR   • Pt seated or upright	CR Entrance & Angle:   • _|_ to 1/2""-1"" posterior to outer canthus   • Collimation:   • Best to Determine:   • Primary-Sphenoidal sinuses, but shows all 4 groups   • Thickness of frontal bone is seen	Eval Criteria:   • SI-Orbital roofs & mandibular rami   • NR by sella turcica in profile   • All 4 sinus groups