What type of collimator will automatically restrict the x-ray beam to the size of the image cassette or image receptor?

Question

Quizplus · Accepted Answer

Positive beam limitation (PBL) is a feature of modern X-ray equipment that automatically measures the size of the image receptor or cassette and adjusts the collimator shutters accordingly, restricting the x-ray beam to the required size. This helps to reduce unnecessary radiation exposure to the patient and improve image quality by minimizing scatter radiation. A diaphragm is a type of collimator that manually adjusts the size of the X-ray beam, while an electronic focused beam collimator adjusts the shape of the beam. Manual collimators require the radiographer to manually adjust the size and shape of the beam.

What Type of Collimator Will Automatically Restrict the X-Ray Beam