What is the typical shape of collimation in fluoroscopy?

In fluoroscopy, collimation is typically designed to improve image quality and reduce patient exposure to unnecessary radiation. The most common shapes used for collimation are circular and rectangular. Circular collimation helps to focus the beam on the area of interest while minimizing exposure to surrounding tissues. Rectangular collimation is often employed to match the shape of the image receptor, further refining the area that is being imaged and enhancing image detail.

These shapes are advantageous in medical imaging because they allow for precise targeting of the radiation beam, thus reducing scatter radiation and helping radiologists and technologists achieve optimal imaging results. In clinical practice, using these shapes harmonizes the collimation with specific diagnostic requirements and ensures that only the necessary area is exposed to radiation, aligning with radiation safety principles.