Why You Might Have a CT Scan:
A CT Scan, like an MRI, provides a clear picture of both bone and soft tissue structures. However, a CT scan gives the option of taking images in a series of planes. In other words, images from a CT scan can show you individual “slices” of your body.
Types of CT Scans:
- A series of rotating X-rays. X-rays are taken continually in a spiral motion around the part of your body being examined. Like a traditional X-ray, low levels of radiation are used and are generally not harmful. However, if you have cancer or if you are pregnant, you may be at a higher risk for exposure.
- Contrast dye scans. If your doctor wants to highlight a certain area in your body, he may choose to use a contrast dye before your scan. This can be administered through a vein, through an enema or using an oral liquid. If you have a contrast CT, you might be asked to fast for several hours beforehand.
What to Expect During Your CT Scan:
For your CT scan, you will most likely be asked to change into a hospital gown. Like an MRI, you will lie on a table that goes into the machine. The CT scan machine is generally less claustrophobic than a traditional MRI. Unlike a standard X-ray, you will not be asked to move once you are in position, though you may be asked to hold your breath from time to time. Most CT scans take only a few minutes to complete, especially if only one area of your body is being scanned.
Source:
Medline Plus. Medical Encyclopedia: CT Scan. Accessed 5/29/09. http://www.nlm.nih.gov/medlineplus/ency/article/003330.htm
