What does backscatter refer to in imaging?

Backscatter in imaging specifically refers to the phenomenon where X-rays bounce off the patient and return to the image receptor. This effect can play a significant role in the quality of the imaging. When X-rays interact with the tissues of the patient, some of them are absorbed, while others scatter. The scattered X-rays, particularly those that reflect back towards the detector, can contribute to image noise and affect contrast.

Understanding backscatter is essential in imaging as it can impact the diagnostic quality of the images produced. Proper positioning and collimation can help minimize backscatter effects, ensuring clearer images and more accurate diagnoses. In this context, the other potential sources of scattered radiation do not pertain to the direct interaction with the patient in a clinical scenario, hence they do not accurately define backscatter in imaging.