Whether or not you can eat before the DR examination is mainly decided according to the examination site. Generally speaking, eating can leave a lot of food residue and even gas in the abdomen, which can easily cause very obvious artifacts and make the image not clear, especially the overlapping images before and after the DR examination. If there are stones, calcifications or masses in the kidneys, the contrast will not be enough to distinguish them, and even sometimes some normal structures, such as the contents of the intestinal lumen, will be regarded as masses, and basically misdiagnosed. Therefore, DR examination of the abdomen, including the pelvis, is not suitable for eating, and if you eat, try to stay for a while to let the food out of the body before examination. Other than that, DR examination of the head, five senses, neck, chest, and limbs can be examined with food, so there is no need to worry too much.