What is the correct positioning of the superior and inferior margins for collimation in a lateral oblique elbow?

For a lateral oblique elbow X-ray, the correct positioning for collimation is to place the superior and inferior margins 1 inch inward from the film margin. This approach focuses on including the area of interest—specifically the elbow joint and the surrounding soft tissues—while minimizing the exposure to unnecessary radiation on adjacent structures.

By collating inward from the edges of the film, you are ensuring that the entire elbow joint is captured in the image without unnecessary distraction from external tissues, and it also helps to enhance the quality of the diagnostic information obtained from the X-ray. Proper collimation is crucial in radiographic imaging for providing clear and accurate results while adhering to safety protocols by limiting radiation exposure.