Most of you must, definitely, be familiar with the word Computerized Tomography, or CT scan, as it is most commonly known as. While you must have heard of the word in various contexts, do you know what exactly is a CT scan?
A computerized tomography, or (CT) scan is nothing but a combination of a series of X-ray images taken from different angles. Computer processing is used to create cross-sectional images, or slices, of the bones, blood vessels, and soft tissues inside your body. But, there is a difference – CT scan images provide more detailed information than plain X-rays. CT scans are painless and take only a few minutes – about 30 minutes.
During the scan, you will be asked to lie on a narrow, mechanized table that slides through the opening into a tunnel. Straps and pillows are used to help you stay in position and stop you from moving. The table is fitted with a special cradle to hold your head still in the case of a head scan. While the table slides you into the scanner, detectors and the X-ray tube rotate around you. Each rotation gives several images of thin slices of your body.
Though the scanning itself is not painful, some people may feel discomfort from having to remain still for a considerable period of time. Such people who have a hard time staying still, or have chronic pain, may find the CT exam to be quite stressful. In such a case, you may be given a mild sedative to help.
A CT scan has many advantages, but is extremely well-suited to quickly examine people who may have suffered internal injuries from car accidents or other types of trauma. A CT scan is used to visualize almost all parts of the body, diagnose disease or injury, and also to plan medical, surgical or radiation treatment.
One of the primary risks of a computerized tomography is that of radiation exposure. During a CT scan, you are briefly exposed to ionizing radiation. But, in this case, the amount of radiation is a little more than you would be exposed to during a plain X-ray, because the CT scan gathers more detailed information. Studies have shown that CT scans are not known to cause long-term harm, although there may be a very small risk of cancer.
In some cases, it may be necessary for the doctor to recommend a CT Contrast scan. This involves injecting a special dye called a contrast material (dye) through a vein in your arm before the CT scan. The dye is needed for some CT scans, to help highlight the areas of your body being examined.
Although it is rare, the contrast material can, sometimes, cause allergic reactions or in some cases medical conditions. Most reactions are mild and can result in a rash or itching. In very rare instances, an allergic reaction can be serious, and even life-threatening. You ought to discuss with your doctor if you had a reaction to contrast material before.
CT scans have many benefits that far outweigh the minor potential risk of radiation. Doctors take care to use the lowest dose of radiation possible to obtain the needed medical information. Now, sophisticated and faster machines use ultramodern technology that require less radiation than was previously used. Here are the advantages of a CT scan:
While you should tell your doctor if you are pregnant, the radiation from a CT scan is unlikely to injure your baby. However, your doctor may recommend another type of exam, such as ultrasound or MRI, to avoid exposing your baby to radiation.
Depending on which part of your body is being scanned, you will be asked to:
If a child is having a CT scan, the doctor may recommend a sedative to keep the child calm and still. Any movement will blur the images and may not give accurate results. Your doctor or nurse will give you detailed instructions on how to prepare your child.
You should also inform your doctor of any recent illnesses, medical conditions such as a history of heart disease, asthma, diabetes, kidney disease or thyroid problems. It should be borne in mind that any of these conditions may increase the risk of an allergic reaction.
After the CT scan you can resume your normal routine. If you were given a contrast material, you may receive special instructions. In some cases, you may be asked to wait for a short time before leaving to ensure that you feel well. After the scan, you will be told to drink a lot of fluids to ensure that your kidneys remove the contrast material from your body.
After the CT scan, a radiologist who is specifically trained to interpret CT scans will analyze the images and send a report. Your doctor will, then, discuss with you about the findings and determine the future course of action.
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