What is the primary purpose of using filters in diagnostic radiology?

Question

Question

Answer 1

Correct Answer: To absorb low-energy X-rays

Rationale:

In diagnostic radiology, filters are used to absorb low-energy X-rays. These low-energy X-rays contribute to patient dose without adding to the diagnostic information in the image.
By absorbing these low-energy X-rays, filters help to reduce the overall radiation dose that the patient receives during the imaging procedure.
This process improves the quality of the diagnostic image by ensuring that only the higher-energy X-rays, which are more likely to penetrate the body and provide useful diagnostic information, reach the image receptor.

Explanation of Other Options:

To focus the X-ray beam

Rationale: Focusing the X-ray beam is not the primary function of filters. This task is generally accomplished by collimators, which narrow the X-ray beam to the area of interest, minimizing exposure to surrounding tissues.

To increase the contrast of the image

Rationale: Filters do not directly increase image contrast. Contrast is typically managed by adjusting the exposure factors, such as the kilovoltage (kV) and milliamperage (mA), as well as by using contrast media.

To reduce patient movement

Rationale: Reducing patient movement is not a function of filters. Techniques to reduce movement include proper patient positioning, immobilization devices, and instructing the patient to remain still during the procedure.

Conclusion:

Filters in diagnostic radiology are primarily used to absorb low-energy X-rays. This absorption reduces unnecessary patient exposure to radiation and improves the quality of the diagnostic image by allowing only higher-energy, more penetrative X-rays to contribute to the image formation.