What is the standard central ray angulation for a lateral projection of the knee?

For a lateral projection of the knee, the standard central ray angulation is 5 degrees caudal. This angulation is necessary to properly visualize the knee joint and to align the imaging plane accurately with the anatomy of interest. The caudal angulation helps to open up the joint space and minimize superimposition of the knee, ensuring that the femoral condyles are fully demonstrated and that any potential abnormalities within the joint are clearly visible.

This standard technique helps radiologic technologists produce high-quality images that allow for a more accurate diagnosis. Understanding the specific angulation required for various projections is crucial for effective imaging, as it directly influences the clarity and diagnostic value of the radiographs.