CAMRT Radiography Practice Exam

What is the distance from the patient when using the Air Gap technique?

1. 5 - 10 cm

2. 10 - 15 cm

3. 15 - 20 cm

4. 20 - 25 cm

The correct answer is: 10 - 15 cm

Using the Air Gap technique in radiography involves a specific distance between the X-ray source and the imaging receptor, which typically falls within the range of 10 to 15 cm. This technique is used to reduce scatter radiation by placing a gap of air between the patient and the image receptor. The purpose of this gap is to allow scattered rays to diverge and not have as much impact on the radiograph, effectively improving image contrast. When considering the chosen answer, the 10 to 15 cm range is optimal for achieving a balance between image quality and exposure. If the distance is too short, scatter radiation may still affect the image; too far, and the sharpness and detail may be lost. This distance has been established through research on optimal settings for radiographic imaging. Other ranges do not provide the same level of effectiveness in minimizing scatter while maintaining good image quality. Distances outside this range could either increase unnecessary radiation exposure or fail to utilize the benefits of the Air Gap technique adequately. Thus, the 10 to 15 cm distance is well-supported by radiographic principles.