"centring pointthe beam is exiting at the nasion"
"collimation"
"orientation portrait"
"detector size24 cm x 30 cm"
"exposure"
"SID100 cm"
"gridyes (this can vary departmentally)"
"orientation portrait"
"SID100 cm"
"the PA view decreases the radiation dose to the eyes compared with the AP view"
"less magnification of the facial bones is achieved compared with the AP view"
"overlap of facial bone structures makes it harder to evaluate the sinuses than with an angled view (e.g. Caldwell view)"