RadPos
6/22/1999
intercondylar view of knee
- Relationship b/w femur at the central ray (45°
)
- Lower leg so proximal tibia is not in the way
- Make them at a perpendicular plane (90°
)
- Central ray is a couple inches proximal to crease of the knee
- Double the mAs from AP shot—better choice
- Measure the central ray for this shot
- Lay pt on table w/tube tilt at 45°
and raise the foot so tibia is perpendicular (support the lower leg)
- Grid or not is depending upon the size (12cm)
- 4 views of knee
- ap
- lateral
- intercondylar
- sunset view of patella
Sunset View of Patella
- difficult to do w/patella (knee) injury
- relationship of tibia and central ray
- angle of 30-35°
- patellar/femoral joint
- 4´
4 beam
- only want to see the joint
- patella is more drawn out laterally
- longer right femoral condyle
Lower Leg
- AP and lateral
- AP
- Toes straight up at the ceiling
- If too long, have to decide which is more important knee or ankle
- Lateral
- Pay attention to pelvis, make sure it is perpendicular
- Don't care if there is a slight bend
- Use same technique calculation as AP
Ankle
- 3 views
- Mortice joint
- Distal tib/fib to talus
- 10´
12 film and divide w/lead vinyl (long dimension)
- central ray is b/w malleoli
- foot is perpendicular to film plane (toes straight up)
- collimate wide enough to include malleoli
- oblique--30°
- improves visualiztion of the mortice joint
- distal tib/fib syndesmosis
- wide pathological diastasis
- lateral
- do not include toes
- central ray at medial malleolus
- foot parallel to film plane
- marker behind the heel
- make sure you can see light behind and below the callcanious
Foot
Dorso/Plantar foot
- tube tilt
- perpendicular to dorsum of the foot
- plantar surface is in full contact w/film
- podiatrist likes weight bearing
- 10´
12 film
- 2 or 3 nolan filter distal 1/3 or 1/2
- big toe and heel on the film
- little toe off the film
- foam support
- inversion to 30°
- filter