AP Lower leg

Question 1

• What SID is ideal for an AP projection of the lower leg and why?

Answer 1

40-48 SID to decrease divergence

Question 2

• If both joints do not fit on a 14x17 portrait/lengthwise, how can the IR be adjusted?

Answer 2

You can have the IR on a diagonal to long axis of lower leg

Question 3

• If both joints still do not fit on the IR, what should be done to demonstrate both joints?

Answer 3

Take 2 images, longer image to sight of injury and overlap second

Question 4

• What is the central ray location?

Answer 4

Midshaft

Question 5

• How should the femoral condyles be positioned in relation to the IR for a properly positioned AP lower leg?

Answer 5

Parallel to IR

Question 6

• How much IR should extend beyond the joints to ensure they will be demonstrated on the image?

Answer 6

1”-1.5” of IR beyond each joint