Lateral and Townes Flashcards
What is a sanitary precaution we may need to take for cranial bones in trauma
Cover the IR in plastic or radiolucent material
What do we need to constantly be aware of when imaging the head
LOC of the patient…symmetry of pupils…patient may vomit… be prepared to log roll
What do we need to do for lateral cranial images to ensure we get all anatomy
Elevate the head on a radiolucent sponge if possible
What is the CR for lateral cranium
Horizontal and perpendicular. 5cm superior to EAM
What needs to be included on lateral cranium
vertex to base of skull, frontal to occipital
How do you evaluate if there is tilt in a lateral image
Orbital roofs. To fix make sure IPL is aligned
How do you evaluate if there is rotation in a lateral image
Sphenoid wings and anterior cranial cortices. Make sure MSP is aligned to fix
When performing facial bones do we include from vertex to mentum
No, we include frontal sinus to hard palate
What is the CR for lateral facial bones
Halfway between outer canthus and EAM
Do we need to put the patient’s head on a sponge for lateral facial bones
No
When performing lateral orbits what do we place closest to the IR
Affected side
Where is the CR for Lateral Orbits
Outer canthus
What do we collimate to for lateral orbits
Include superior orbital roof to upper palate, do not extend collimation past the anterior clinoids
What instructions do we give patients receiving lateral orbits image
Look straight ahead/close eyes
What angle is the AP Townes projection from the OML
30 degrees caudad
What andgle is the AP Townes projection from the IOML
37 degrees caudad
What do we include on an AP Townes
Vertex to base of skull.
Where do we want to see the dorsum sella in AP Townes
In the foramen magnum
What is a “slit townes”
Facial bones using the AP Axial Townes method
Where is the CR for Slit Townes
30 degrees caudad to the OML, entering at level of zygomatic arches (or through the TMJ)
What is an SMV projection
When we want to see the zygomatic arches free of superimposition. The CR enters cephalad into the MSP at the throat about 2.5cm inferior to outer canthi
What collimation landmarks are used for SMV
Include lateral skin lines, superior to chin and inferior to gonions
