Week 10 - Nasal Bones

These flashcards cover key concepts and technical details related to nasal bone imaging, including projection techniques, anatomy, and radiographic principles.

What two projections are used for nasal bone imaging?

Parietoacanthial (Waters) and Lateral.

What is the CR exit point for the Waters projection?

Acanthion.

What angle should the OML form with the IR in Waters?

37°.

Which line is perpendicular to the IR in the Waters projection?

Mentomeatal line (MML).

What happens if the patient cannot extend the neck enough?

Angle the CR to achieve the same anatomical relation.

What anatomy is best demonstrated in Waters for nasal bones?

Nasal bones and upper facial bones.

Where is the CR centered for a lateral nasal bones projection?

2.5 cm (1 inch) inferior to the nasion.

What is the patient’s position for a lateral nasal view?

True lateral, side of interest closest to IR.

Which line ensures no head tilt in lateral nasal bones?

Interpupillary line (IPL).

What structures are shown in a lateral nasal bone projection?

Nasal bones, frontonasal suture, anterior nasal spine, soft tissues.

What kVp range is used for the Waters view?

75–85 kVp.

What kVp range is used for the Lateral nasal view?

60–70 kVp.

What size IR is used for both projections?

18×24 cm.

What indicates no motion on a nasal bone image?

Sharp bony margins.

How can motion be prevented during exposure?

Instruct the patient to suspend respiration.

What is the role of the MSP in the Waters projection?

Must be perpendicular to the IR to avoid rotation.

What does OML stand for?

Orbitomeatal line.

What does MML stand for?

Mentomeatal line.

What should the radiograph show for correct lateral positioning?

Nasal bones without tilt or rotation.

Which projection demonstrates both nasal bones and soft tissues?

Lateral projection.