Radiologic Technologist Practice Exam

What technique can be used to improve image quality by reducing scatter radiation?

1. Increased kVp

2. Air-gap technique

3. Filtration

4. Collimation

The correct answer is: Air-gap technique

The air-gap technique is effective in improving image quality by minimizing the impact of scatter radiation. This method generally involves positioning the image receptor further away from the patient. By increasing the distance between the patient and the receptor, the scattering of radiation can be reduced before it reaches the film or detector. This separation allows less scattered radiation to contribute to the final image, leading to a clearer and more defined radiographic representation. This technique is particularly beneficial in situations where scatter is expected to be high, such as with larger patients or certain types of anatomical imaging. By utilizing an air gap, the radiologic technologist can enhance the contrast and quality of the image, making it easier for radiologists to interpret the results accurately. While increased kVp, filtration, and collimation can also play roles in controlling scatter radiation, they have different mechanisms and implications. Increased kVp generally results in higher energy radiation that can penetrate tissues better, but it may increase scatter as well. Filtration is designed to remove low-energy photons from the beam, which helps improve image contrast, but does not directly reduce scatter from the patient’s body. Collimation helps direct the primary beam, limiting the exposure area and thus potentially reducing scatter, but it is the air-gap technique that specifically