The collective dose is the sum of individual doses. Collective doses are received in a given period of time by a specific population and a specific radiation exposure.

The collective effective dose is the product of the mean effective dose for a population and the number of individuals; or the sum of all individual effective doses in the population of concern.

A colonoscopy is an examination of the colon. To visualize the inner surface of the bowel, a lighted, flexible tubular instrument is inserted through the rectum. A conventional colonoscopy may take up to 2 hours counting recovery time from an often necessary sedation.
A virtual colonoscopy offers this sight into the body without this discomfort.

See Virtual Colonoscopy.

(CDE) The committed dose equivalent is the organ or tissue dose that will be received from the intake of radioactive material during the next 50 years.

(CEDE) The committed effective dose equivalent refers to the committed dose equivalent for a human organ or tissue multiplied by a weighting factor.