"patient’s shoulders should be at equal distances from the image receptor to avoid rotation, the head facing straight forward."
"Positional errors "
"The odontoid or 'peg' projection, also known as the open mouth AP projection (or radiograph), is an AP projection of C1 (atlas) and C2 (axis) with the patient's mouth open."
"The odontoid or 'peg' projection, also known as the open mouth AP projection (or radiograph), is an AP projection of C1 (atlas) and C2 (axis) with the patient's mouth open."
"patient positioned erect in AP position unless trauma the patient will be supine"
"SID100 cm"
"centring point"
"collimation"
"orientationlandscape"
"detector size18 cm x 24 cm"
"exposure"
"SID100 cm"
"gridyes"
Expected headings
"Positional errors "
"Teeth superimposing the dens"
"Skull base superimposing the dens"
"angle accordingly; see 'patient positioning'"
"make sure that any removable artifacts such as earrings, glasses or metal dentures are removed to avoid obscuring the anatomy of interest"