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RAD141-Chap 7c

RAD141-Chap 7c - AP & Lateral Weight-bearing projections - foot

Why used? to check the arches of the foot under the full weight of body
Which projection demonstrates which arch? the lateral projection demonstrates the longitudinal arch; the AP demonstrates the horizontal arch
What is an additional consideration for laterals? both feet are usually take for comparison (separately)
What IR size s/b used? 8 x 10 or 10 x 12
Should a detail screen be used? yes
What is the proper kV range? 65 +/- 5 kV
Is shielding appropriate? yes - gonadal
What is the patient position for the AP weight-bearing projection? patient stands erect, full weight evenly distributed on both feet; feet directed straight ahead, parallel to each other
What is the CR position for the AP? book says that the CR is angled 15 deg posteriorly to midpoint between feet at level of base of metatarsals
How should the patient be positioned for a lateral weight-bearing projection? patient stands erect, weight evenly distributed, standing on wood blocks placed on a step stool or footrest (provide support for patient to hold onto); support vertical cassette between feet, with long axis of foot to long axis of IR
How should the patient be positioned for the 2nd foot in a lateral weight-bearing foot? change cassettes and turn patient for lateral of other foot for comparison after 1st lateral is taken
What is the CR position for the lateral? directed horizontally to level of base of third metatarsal
What is the radiographic criteria for AP? projection show soft tissue surrounding phalanges to distal portion of talus; open tarsometatarsal joint spaces and visualization of the joint between 1st & 2nd cuneiforms; metatarsal bases s/b at center of collimated field
What is the radiographic criteria for structures shown and positioning for the lateral? entire foot and min 1 inch of distal tibia-fibula (distal fibula should not be superimposed over posterior half of the tibia and plantar surfaces of heads of metatarsals should appear directly superimposed)
Created by: debmurph