Facial Bones, Etc

Question 1

Blowout fractures are best demoed on which projection?

Answer 1

Modified Waters (parietocanthial)

Question 2

Tripod fracture involves which facial bones?

Answer 2

Zygomatic

Question 3

BOTH zygomatic arches can be demoed which projections? (Both seen on only 1 projection)

Answer 3

SMV and AP Axial

Question 4

Waters method for facial bones-OML is at what angle to the IR?

Answer 4

37 degrees

Question 5

Tangential projection of zygomatic arches, head is positioned so midsagittal plane is rotated ___ degrees and ___ the side being examined.

Answer 5

15, toward

Question 6

Where should petrous ridges be located in Modified Waters

Answer 6

Halfway through maxillary sinuses

Question 7

Where should petrous ridges be located for Waters??

Answer 7

Just below maxillary sinuses

Question 8

Where is CR directed for lateral projection of nasal bones?

Answer 8

1/2 inch distal to the nasion

Question 9

What is CR angulation for AP Axial projection of zygomatic arches?

Answer 9

30 degrees caudad

Question 10

What degree of CR angle for AP Axial, Town method for mandible, with OML perpendicular to IR?
What’s CR angle for IOML?

Answer 10

OML: 35 degrees caudad
IOML: 42 degrees caudad

Question 11

What is a radiographic sign of a blowout fracture of the orbit?

Answer 11

Air fluid levels in the maxillary sinuses

Question 12

What is primary positioning error for Rhese with optic foramen in upper quad of orbit?

Answer 12

Insufficient extension of skull

Question 13

Where is CR centered for parietocanthial projection for facial bones?

Answer 13

Exit at acanthion

Question 14

What best demos bony septum deviation?

Answer 14

Parietocanthial

Question 15

What best demos frontal and ethmoid sinuses?

Answer 15

PA Caldwell

Question 16

Where is CR centered for lateral facial bones?

Answer 16

Independent malar bone (zygomatic arch)