What is the purpose of a grid in radiography?

Question

Question

Answer 1

Correct Answer: To absorb scatter radiation

Rationale:

A grid in radiography is a device used to improve the contrast of the radiographic image. It is placed between the patient and the image receptor to absorb scatter radiation that is produced when X-rays interact with the patient's body. Scatter radiation can degrade the quality of the image by causing fog, which reduces the visibility of anatomical structures.
The grid consists of thin lead strips separated by radiolucent material. The lead strips absorb the scatter radiation while allowing the primary X-rays to pass through and reach the image receptor, thus enhancing image contrast and clarity.

Explanation of Other Options:

To magnify the image

Rationale: Magnification in radiography is achieved through the geometric setup of the X-ray tube, the patient, and the image receptor. It is not a function of the grid. The distance between the X-ray source and the image receptor, as well as the positioning of the patient, determine the magnification.

To increase the X-ray intensity

Rationale: The intensity of the X-ray beam is controlled by the settings on the X-ray machine, specifically the tube current (mA) and the exposure time (seconds). The grid does not influence the intensity of the X-ray beam.

To reduce patient exposure

Rationale: The primary means of reducing patient exposure to X-rays include using appropriate exposure settings, proper patient positioning, and employing shielding techniques. While grids improve image quality by absorbing scatter radiation, they do not directly reduce the patient's exposure to the primary X-ray beam.

Conclusion:

The main purpose of a grid in radiography is to absorb scatter radiation, which improves the contrast and quality of the radiographic image. This is crucial for accurate diagnosis and reducing the potential for misinterpretation. The other options provided are not the primary functions of the grid and are related to other aspects of radiographic imaging.