Dental OSCE (Objective Structured Clinical Examination) Practice Exam

What type of collimation is preferred to minimize radiation dose?

1. Circular collimation

2. Rectangular collimation

3. Conical collimation

4. Variable collimation

The correct answer is: Rectangular collimation

Rectangular collimation is preferred to minimize radiation dose because it confines the x-ray beam to the area of interest more effectively than other collimation shapes. This focused approach reduces the amount of radiation that is scattered outside the target area, thereby decreasing the overall exposure to surrounding tissues. In dental imaging, the use of rectangular collimation aligns the x-ray beam closely with the size and shape of the film or sensor, ensuring that only the area being examined is irradiated. This results in a more efficient use of the radiation dose, translating to lower exposure rates for patients. Additionally, rectangular collimation has been shown to significantly reduce the volume of tissue that receives radiation compared to circular collimation, making it a superior choice for patient safety. By reducing unnecessary radiation exposure, practitioners not only comply with the principles of radiation protection but also enhance patient trust and comfort during procedures.