Unlike a conventional x-ray&#;which uses a fixed x-ray tube&#;a CT scanner uses a motorized x-ray source that rotates around the circular opening of a donut-shaped structure called a gantry. During a CT scan, the patient lies on a bed that slowly moves through the gantry while the x-ray tube rotates around the patient, shooting narrow beams of x-rays through the body. Instead of film, CT scanners use special digital x-ray detectors, which are located directly opposite the x-ray source. As the x-rays leave the patient, they are picked up by the detectors and transmitted to a computer.
Each time the x-ray source completes one full rotation, the CT computer uses sophisticated mathematical techniques to construct a two-dimensional image slice of the patient. The thickness of the tissue represented in each image slice can vary depending on the CT machine used, but usually ranges from 1-10 millimeters. When a full slice is completed, the image is stored and the motorized bed is moved forward incrementally into the gantry. The x-ray scanning process is then repeated to produce another image slice. This process continues until the desired number of slices is collected.
Image slices can either be displayed individually or stacked together by the computer to generate a 3D image of the patient that shows the skeleton, organs, and tissues as well as any abnormalities the physician is trying to identify. This method has many advantages including the ability to rotate the 3D image in space or to view slices in succession, making it easier to find the exact place where a problem may be located.
A CT scan can see nearly all parts of the body. It's used to diagnose disease or injury as well as to plan medical, surgical or radiation treatment.
A computerized tomography scan, also called a CT scan, is a type of imaging that uses X-ray techniques to create detailed images of the body. It then uses a computer to create cross-sectional images, also called slices, of the bones, blood vessels and soft tissues inside the body. CT scan images show more detail than plain X-rays do.
A CT scan has many uses. It's used to diagnose disease or injury as well as to plan medical, surgical or radiation treatment.
Your healthcare professional may suggest a CT scan for many reasons. For instance, a CT scan can help:
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During a CT scan, you're briefly exposed to a type of energy called ionizing radiation. The amount of radiation is greater than the amount from a plain X-ray because the CT scan gathers more-detailed information.
The low doses of radiation used in CT scans have not been shown to cause long-term harm. But for repeated scans, there may be a small increase in the lifetime risk of cancer. This can affect children more than adults.
CT scans have many benefits that outweigh any small risk. Healthcare professionals use the lowest dose of radiation to get the needed medical information. And newer, faster machines and techniques use less radiation than older CT scans did. Talk with your healthcare professional about the benefits and risks of a CT scan.
Tell your healthcare professional if you're pregnant. The radiation from a CT scan is unlikely to harm your baby unless the scan is of your belly or pelvis. But your health professional might suggest another type of exam so that the baby isn't exposed to radiation. Exams that don't use radiation include ultrasound and MRI.
A special dye called contrast material is needed for some CT scans. The dye appears bright on images. So it makes certain areas of the body that are being scanned show up better. This can help make blood vessels, intestines or other structures easier to see.
Contrast material might be given:
Although rare, medical problems or allergic reactions can happen with contrast material. Most reactions are mild and result in a rash or itchiness. More rarely, an allergic reaction can be serious, even life-threatening. Tell your healthcare professional if you've ever had a reaction to contrast material.
Depending on which part of your body is being scanned, you may be asked to:
If your infant or toddler is having a CT scan, the healthcare professional may suggest a medicine called a sedative to help keep your child calm and still. Movement blurs the images and may affect the results. Ask your health professional how to help get your child ready for the scan.
You can have a CT scan in a hospital or an outpatient facility. CT scans are painless. With newer machines, scans take only a few minutes. The whole process most often takes about 30 minutes.
A CT scanner is shaped like a large doughnut standing on its side. You lie on a narrow table with a motor that slides through the center of the scanner into a tunnel. Straps and pillows may be used to help you stay in place. During a head scan, the table may be fitted with a special cradle that holds your head still.
While the table moves you into the scanner, the X-ray tube rotates around you. Each time it rotates, it gives images of thin slices of your body. You may hear buzzing and whirring noises.
A healthcare professional called a CT technologist sits in another room and can see and hear you. You can talk with the technologist through an intercom. To help you keep still during the scan, the technologist might ask you to hold your breath at certain points. Movement can blur the images.
After the exam you can return to your regular routine. If you were given contrast dye, you may be asked to wait for a short time before leaving to make sure that you feel OK after the exam. You also might be told to drink lots of fluids to help your kidneys remove the dye from your body.
CT images are stored as electronic data files. They're most often reviewed on a computer screen. A doctor who specializes in imaging, called a radiologist, looks at the images and creates a report that's kept in your medical records. Your healthcare professional talks with you about the results.
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