What degree and direction of angulation is used for the CR for an AP axial projection, Towne
method, of the skull if the patient is able to depress their chin aligning the OML perpendicular to
the IR? - ANS30 degrees caudal
Which cranial positioning line should be perpendicular to the IR if the patient is unable to flex
their neck for an AP axial, Towne method, of the skull? - ANSInfraorbitomeatal line (IOML)
When the IOML is adjusted perpendicular to the IR, the CR would need to be angled 37
degrees caudad.
What is the CR entrance point for a properly positioned AP axial projection, Towne method, of
the skull? - ANS2.5 inches superior to the glabella
What degree and direction of angulation is used for the CR of a PA axial projection, Caldwell
method, of the skull? - ANS15 degrees caudad
The petrous pyramids are in the lower third of the orbit during this projection
What is the degree and direction of CR angulation for a PA projection of the skull? - ANS0
degrees (perpendicular)
Petrous pyramids fill the orbits during this projection
A patient should be positioned with what two points of their anatomy touching the IR for a PA
projection of the skull? - ANSForehead and nose
Which cranial positioning line is perpendicular to the IR for a PA projection of the skull? -
ANSOrbitomeatal line (OML)
Which line or plane is perpendicular to the IR when performing a lateral skull radiograph? -
ANSInterpupillary line (IPL)
What is the recommended SID for a lateral skull radiograph? - ANS40 inches
Which cranial positioning line is parallel to the IR when positioning the patient for a SMV skull
radiograph? - ANSInfraoribitomeatal line (IOML)
The submentovertical (SMV) projection of the skull is best defined by what? - ANSProjection
from below the mandible through the vertex of the skull
What is the recommended patient position for the SMV projection of the skull? - ANSStanding or
sitting at the upright Bucky
What is the recommended SID for a SMV projection of the skull? - ANS40 inches
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