A Radiograph of a PA Axial Projection for the Intercondylar

A radiograph of a PA axial projection for the intercondylar fossa (Camp-Coventry method) does not demonstrate the fossa well.It is foreshortened.The following positioning factors were used: patient prone, knee flexed 40° to 45°, CR angled to be perpendicular to the femur, 40-inch SID, and no rotation of the lower limb.Based on the factors used, what changes need to be made to produce a more diagnostic image?

A) Increase SID to at least 48 inches (123 cm) .
B) CR must be perpendicular to lower leg.
C) Rotate lower extremity 10° medially.
D) Reduce flexion of the knee to 20° to 30°.