Heavy metals such as cadmium, lead and mercury are common air pollutants. and are emitted (predominantly into the air) as a result of various industrial ac-. tivities. This report reviews the available information on the sources, chemical. properties and spatial distribution of pollution by cadmium, lead and mercury.
Assuming that you are already inside the CT scanner ready to get scanned. CT scan without contrast (head, sinus, orbits, abdomen, pelvis, cervical, thoracic, lumbar and dental scans) take approximately 15 minutes. CT studies with contrast of the chest, pelvis, head or neck take approximately 30 minutes. Whereas, aortic contrast studies may take up to 45 minutes.
The mass becomes brighter with contrast dye if it has a lot of blood vessels. Contrast dye is also used to produce an image of the blood vessels of the head and brain. The total amount of time in the CT scanner is usually a few minutes. The contrast dye injection may cause a slight temporary burning sensation in the arm, metallic taste in the mouth, or whole body warmth.