What is the purpose of the collimator in an X-ray machine?

Question

Question

Answer 1

Correct Answer: To reduce scatter radiation

Rationale:

The collimator in an X-ray machine is a device that narrows the X-ray beam to a specific area of interest. This is crucial as it serves to reduce scatter radiation, which can degrade the quality of the X-ray image and increase unnecessary radiation exposure to surrounding tissues.
By focusing the X-ray beam, the collimator ensures that only the area of interest is exposed to radiation, thereby improving the diagnostic quality of the image by increasing contrast and reducing the amount of scattered radiation that reaches the image receptor.
Reducing scatter radiation is essential for obtaining clear and precise images, which are critical for accurate diagnosis and treatment planning.

Explanation of Other Options:

To protect the patient

Rationale: While reducing scatter radiation indirectly protects the patient by limiting radiation exposure, the primary purpose of the collimator is not patient protection. Protection is primarily achieved through shielding and proper exposure techniques.

To increase image resolution

Rationale: While collimation can improve image quality by reducing scatter radiation, the primary factor affecting image resolution is the detector and image processing technology. Collimators help but are not the main tool for increasing resolution.

To reduce patient movement

Rationale: Reducing patient movement is generally managed through patient positioning aids and instructions. The collimator does not play a direct role in minimizing patient movement during the imaging process.

Conclusion:

The collimator’s primary function is to reduce scatter radiation, which enhances image quality and reduces unnecessary radiation exposure. While it indirectly contributes to patient protection and improved image resolution, its main role is focused on controlling the X-ray beam to minimize scatter.