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Facial positioning
Facial bones and paranasal sinuses positioning
Question | Answer |
---|---|
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 |