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.
If contrast material is needed, the technologist will put it in an intravenous (IV) line in a vein in your arm or hand. The material may be given over 1 to 2 minutes. Then more MRI scans are done. An MRI test usually takes 30 to 60 minutes but can take as long as 2 hours.