The collimator alignment must be accurate to within what percentage of the source-to-image distance (SID)?

The collimator alignment must be accurate to within 2% of the source-to-image distance (SID) to ensure optimal image quality and patient safety. Collimation serves to define the area being imaged and limits unnecessary radiation exposure. If the collimator is misaligned, it can lead to overexposure or underexposure of the image, potentially obscuring critical details needed for diagnosis.

By maintaining an alignment accuracy of 2% of the SID, radiographic facilities can ensure that the beam size matches the area of interest, improving the precision of the imaging process while also reducing the risk of radiation dose to surrounding tissues. This standard supports a balance between achieving high-quality diagnostic images and adhering to radiation safety protocols.