nasal bones positioning quiz

Indicate how the IP line should be positioned with reference to the IR for the lateral projection

Perpendicular

Indicate how the MSP should be positioned with reference to the IR for the lateral projection

Parallel

Describe the position of the patient in order to place the lateral side of their head closest to the IR

• Body in LAO position

• IP line perpendicular

• IOML is perpendicular with the front edge of the cassette

Describe how you would adjust the radiation field size for the lateral projection

Extends from the glabella to 1 inch inferior to the acanthion and 1 inch beyond the top of the nose

Describe how and where the central ray should be directed for the lateral projection

Perpendicular to the bridge of the nose at a point ½ inch distal to the nasion

Evaluation criteria for the lateral projection

• the anterior nasal spine and frontonasal suture should be visualized

• The nasal bone and soft tissue should be demonstrated without rotation

Indicate how the OML should be positioned with reference to the IR for the PA waters

37 degree angulation with the IR

Indicate how the MSP should be positioned with reference to the IR

Perpendicular to the IR

To which landmark of the head should the IR be centered for the PA waters?

Acanthion

How should the central ray be directed relative to the IR?

Perpendicularly

Describe how the petrous ridges most likely will appear in the image if the OML creates 25 degree angle with the IR

Too far under the maxillae

Describe how the petrous ridges most likely will appear in the image if the OML creates 37 degree angle with the IR

Immediately below the maxillae

Describe how the petrous ridges most likely will appear in the image if the OML creates 55 degree angle with the IR

Superimposing the maxillary sinuses

Evaluation criteria for PA waters

• the petrous ridges should be projected immediately below the maxillary sinuses

• The distance between the lateral border of the skull and orbit should be equal on both sides