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Minimum SID—
40 inches (102 cm); may increase to 44 to 48 inches
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IR size—
(14 × 17 inches), lengthwise (or diagonal, which requires 44 inches SID)
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Kvp Range
Digital systems—70 to 80 kV range
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Patient Position
Place patient in the supine position; provide a pillow for patient’s head; leg should be fully extended.
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Part Position
- • Adjust pelvis, knee, and leg into true AP with no rotation.
- • Place sandbag against foot if needed for stabilization, and dor-siflex foot to 90° to leg if possible.
- • Ensure that both ankle and knee joints are 1 to 2 inches (3 to5 cm) from ends of IR (so that divergent rays do not projecteither joint off IR).
- • If limb is too long, place the leg diagonally (corner to corner)on one 35 × 43 cm (14 × 17 inches) IR to ensure that both joints are included. (Also, if needed, a second smaller IR may be taken of the joint nearest the injury site.)
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CR Centered to
perpendicular to IR, directed to midpoint of leg
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Recommended Collimation
Collimate on both sides to skin malleolusmargins, with full collimation at ends of IR borders to include maximum knee and ankle joints.
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Anatomy Demonstrated:
• Entire tibia and fibula must include ankle and knee joints on this projection
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