X-rays emitted from the machine passes through the patient's body where they are more or less attenuated depending on the fabric passing through. The rays are not absorbed by the body impressed the film's behind. Therefore, at the very dense bodies such as bone, that let a few rays, the plate will be white, and low density structures such as the air in the lungs or intestines allow the passage of many rays and therefore appear dark. It's possible to use also radio-contrast agents or radio-opaque and transparent that emphasize the contours of the body observed, making it easier analysis
No comments:
Post a Comment