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How long does a CT Scan take?
Depending on the type of CT Scan being performed, it may take anywhere from 15 minutes to 2 hours.
Does it hurt?
The CT Scan procedure itself does not hurt. Certain contrast-enhanced studies may require a needle stick and injection.
When will my doctor get the results?
Results are usually received within three to five working days. |
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What is the difference between CT and MR Scanning?
CT Scans use x-ray to create images. MR uses a magnetic field. The MR scanner is shaped like a tunnel, whereas the CT Scanner is more like a "doughnut."
What is a CT Scan?
CT stands for Computerized Tomography. It is sometimes referred to as CAT Scan, which stands for Computerized Axial Tomography. It is a modern medical diagnostic x-ray procedure that uses a computer to take cross-sectional images.CT Scan, like conventional x-rays, uses radiation. CT Scans are able to detect some conditions that conventional x-rays cannot, since CT Scans can show a cross sectional view.
Is CT Scanning safe?
As with any x-ray procedure, radiation is a risk. CT Scans are designed to obtain the most information with the least possible radiation exposure.
How does CT work?
Beam
An x-ray tube focuses a narrow beam of x-rays across one layer, or "slice," of the body. The x-ray's energy is absorbed differently by structures of various density.
Detectors
Detectors, located opposite the x-ray tube, detect the number of x-rays remaining (after the x-rays have passed through the body). This information is relayed to a computer, where it is measured and stored.
Rotation
The x-ray tube rotates (scans) around the body. Thousands of readings are taken by the detectors and recorded in the computer. ·
Computer
The computer analyzes the detector’s readings and calculates x-ray absorption at thousands of different points. The calculations are converted into an image on a video screen. ·
Image
The radiologist can study the image and interpret the findings.
What can CT evaluate?
CT Scans can evaluate brain, bone, organ and some soft tissue structures. During pregnancy
CT Scans should be avoided except in life-threatening situations.
What can I expect from an exam?
The following are explanations of a typical exam. Exams may differ based on the individual patient. ·
Examining Table
You will lie down on an examining table and a technologist will assist you into the position for the scan. ·
Contrast medium
A contrast medium may be administered at this point, or after the first set of scans. Contrast is used to highlight blood vessels in tissues and organs that may otherwise not be clearly seen. Tissues and organs don't absorb radiation as well as bones, and contrast medium enables these structures to visualize better on x-rays. ·
Cradle
If a CT of the head is being performed, the technologist will place your head in a cradle with a strap. This helps keep you from moving because even slight movements blur results. ·
Scanner Gantry
You will be moved into the CT scanner. The technologist will control the procedure from an adjacent room, but he or she can still see you. · Scan
You will hear the sounds of the motors as the x-ray equipment scans. The table moves you during the scan. ·
After the Exam
If more information is needed after the technologist or radiologist examines the results, more scans may be taken. The radiologist will provide your physician with an interpretation of the results, allowing your physician to explain what the findings mean for you in terms of health, treatment, etc.
How should I prepare?
You may be told to avoid solid food six hours prior to your scan. Clear liquids and medications may be taken up until the time of the exam. For more information, click Preparations.
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