Radiography: Head Flashcards
When used in the context of radiographic positioning techniques, what does the term cephalic refer to?
Angled towards the head
What part of the anatomy is referred to as the lateral canthus?
The outer angle of the eye
A patient has just undergone a series of radiographs of their facial bones. The radiologist notes a blowout fracture. What anatomical component is affected by a blowout fracture?
The orbital floor
What is the largest facial bone?
The mandible
The ____________ is the point located at the junction of the nose and the upper lip.
acanthion
When performing an anteroposterior axial projection/view (the Towne method) of the skull, the central ray of the X-ray beam should be angled ________ caudad to center of the image receptor, through the foramen magnum, at the level of the external auditory meatus.
30°
When performing a parietoacanthial projection/view (the Waters method), the mentomeatal line should be perpendicular to the image receptor, while the orbitomeatal line forms a ________ angle to the image receptor.
37°
When performing a posteroanterior axial projection/view (the Caldwell method) of the cranium, the orbitomeatal should be perpendicular to the image receptor, while the central ray of the X-ray beam should be angled ________ caudad to the center of the image receptor and exist at the nasion.
15°
Which skull radiography positioning baseline extends from the outer corner of the eye to the external auditory meatus?
The orbitomeatal line
When performing a submentovertex (full basal) projection/view of the skull, what positioning baseline is parallel to the plane of the image receptor?
The infraorbitomeatal line
In general, trauma radiography requires orthogonal views to be taken, specifically 2 projections taken at ____________ while true CR-part-IR alignment is maintained.
90° apart (or at right angles)
Certain positioning lines are important in cranial radiography, which are formed by connecting certain facial landmarks to the midpoint of the ________________
external auditory meatus (EAM)
Which radiographic projection/view is used to BEST visualize the sphenoid sinuses?
The submentovertical (SMV) view
When performed correctly, what radiographic projection/view features the petrous pyramids filling the lower one-third of the orbits?
The posteroanterior (Caldwell) view
Which radiographic projection/view is used to BEST visualize the maxillary sinuses?
The Waters view
When positioning a patient for a lateral facial bone X-ray, with the lateral aspect of their head resting against the upright bucky, the midsagittal plane should be ________________to and the interpupillary line should be ________ to the image receptor.
parallel to; perpendicular
If the Rheese projection/view of the orbits is performed correctly, the optic foramen should be projected into which quadrant?
The lower outer quadrant
. When performing the axiolateral oblique temporomandibular joint (TMJ) projection/view, the central ray of the X-ray beam should be angled in a caudad direction and centered 5 cm superior to and 1 cm anterior to the external auditory meatus.
25° to 30°
Because trauma patients often arrive in the imaging department in a supine position, what projections are commonly required to serve as lateral projections?
Horizontal beam (cross-table) projections
When performing the axiolateral oblique temporomandibular joint (TMJ) projection/view, the central ray of the X-ray beam should be angled ____________ in a caudad direction and centered 2 inches (5 cm) superior to and ½ inch (1.3 cm) anterior to the external auditory meatus.
25° to 30°
Why are open- and closed-mouth axiolateral temporomandibular joint (TMJ) projections often taken?
To show the TMJ’s range of motion
Which facial bone(s) is/are most often fractured?
The nasal bones
What projection/view is used to demonstrate all 4 paranasal sinuses?
The lateral
Which facial bone(s) is/are unpaired?
The mandible and vomer
