How many sets of shutters are found in collimators?

• A. 1
• B. 2
• C. 3
• D. 4

Answer: (B)

Collimators are devices used in radiology and nuclear medicine to narrow the beam of radiation to provide high-quality imaging. They feature two sets of adjustable shutters that enable precise control of the radiation that reaches the detector. The first set of shutters usually serves to limit the field size and reduce the amount of scattered radiation, while the second set fine-tunes the direction of the beam to improve resolution and reduce patient exposure to unnecessary radiation.

Having two sets of shutters allows for effective modulation of the beam, making it possible to optimize image quality while ensuring the safety of patients and personnel.