CAMRT Radiography Practice Exam

What effect does the anode heel effect have on imaging?

1. Improves resolution

2. Balances exposure across the image

3. Enhances image contrast

4. Reduces scatter radiation

The correct answer is: Balances exposure across the image

The anode heel effect refers to the phenomenon where X-ray intensity is greater on the cathode side of the X-ray tube compared to the anode side. This occurs because the X-ray beam is directed at an angle, and as the X-rays pass through the anode, some of the radiation is absorbed by the anode material, reducing the intensity on that side. When imaging, this effect can lead to a gradient of exposure across the image, where the side closest to the anode receives less radiation than the side closest to the cathode. Understanding this variance allows radiographers to position the area of interest appropriately within the beam to achieve a more uniform exposure. By placing the denser or more critical parts of the anatomy on the cathode side, it compensates for the decreased intensity on the anode side, which effectively balances exposure across the image. This knowledge is crucial for optimizing image quality and ensuring that all necessary structures are adequately visualized. While the anode heel effect can also influence other factors such as image contrast and resolution, the primary effect relevant to this question is its ability to balance exposure across the imaging field.