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Facial positioning

Facial bones and paranasal sinuses positioning

QuestionAnswer
For the lateral facial bones, which two lines need to be perpendicular to the IR? Interpupillary line (IPL) and the IOML
Where is the CR for the lateral facial bones? to the zygoma (prominence of the cheek)
What is another name for the Parietoacanthial projection? Waters Method
For the waters facial bones, the OML will form what angle with the table? 37
Where is the CR centered for the waters facial bones? To exit at the acanthion
For a waters facial bones, where are the petrous ridges located? Inferior to the maxillary sinuses
A radiograph of a waters facial bones shows the petrous ridges superior to the posterior maxillary sinuses. What positioning error occurred? The patients chin was not elevated enough
A radiograph of the waters facial bones shows the petrous ridges inferior to the maxillary sinuses and posterior maxillary alveolar process. What positioning error occurred? The patients chin was elevated too much
which line for a PA axial (Caldwell) facial bones needs to be perpendicular to the IR? The OML
What is the CR angle for a Caldwell facial bones? 15 caudad
Where does the CR exit for the Caldwell facial bones? The nasion
If the orbital floors are the area of interest, what would the CR angle be? 30 caudad
For the Caldwell facial bones where are the petrous ridges projected? The lower one-third of orbits
which projection best demonstrates the orbital floors? Modified Waters (facial bones)
Which line is perpendicular to the IR for the modified waters (facial bones)? lips-meatal line (LML)
The OML forms what kind of angle for the modified waters (facial bones)? 55
where does the CR exit for the modified waters (facial bones)? The acanthion
For the modified waters where are the petrous ridges projected? Into the lower half of the maxillary sinuses
Which line is perpendicular to the IR for the lateral nasal bones? The IPL
Where is the CR for the lateral nasal bones? 1/2 in inferior to nasion
Which projection will best show medial-lateral displacement of the nasal bones? superoinferior tangential (axial) projection
The IR is perpendicular to the GAL in which projection? Tangential (axial) nasal bones
How and Where is the CR for the tangential (axial) nasal bones? CR centered to the nasion and angeled as needed to ensure that it is parallel to GAL
A radiograph of a tangential (axial) nasal bones shows the alveolar ridge. What positioning error occurred? Over extension
A radiograph of the tangential (axial) projection of the nasal bones shows too much of the glabella. What positioning error occurred? Excessive flexion
Where is the CR for the submentovertex projection of the zygomatic arches? Midway between the zygomatic arches (1/2 in inferior to mandibular symphysis)
For the oblique tangential projection of the zygomatic arches, how is the head placed? vertex placed against table/bucky, rotated 15 toward side to be examined and tilted 15 toward side to be examined
What is another name for the AP axial projection of the zygomatic arches? Modified towne (Jug-handle view)
What is the CR angle for the AP axial zygomatic arches if the IOML is perpendicular to the IR? 37 caudad
What is the angle for the AP axial zygomatic arches if the OML is perpendicular to the IR? 30 caudad
Where is the CR for the AP axial zygomatic arches? 2.5 cm (1in) superior to the glabella at the level of the gonion
What is another name for the Parietoorbital obliwue projection of the optic foramina? Rhese method (three-point landing position)
Which line is perpendicular to the IR in the Rhese method of the orbits? AML
What is the degree of obliquity for the patients head in the Three-point landing method? 37 toward affected side. angle formed between MSP is 53
Where is the CR for the Parietoorbital oblique projection of the orbits? At the midportion of the downside orbit
Where is the optic foramen in the Rhese method of the orbits? In the lower outer quadrant of the orbit
Created by: aporche150