What Exactly is a CT Scan?
Doctors can see inside your body with a computed tomography (CT or CAT) scan. It creates images of your organs, bones, and other tissues using X-rays and a computer. It provides more information than a standard X-ray.
A CT scan can be performed on any part of your body. The procedure takes only a few minutes and is completely painless.
How Do CT Scanners Operate?
They use an X-ray beam that is narrow and circles around one part of your body. This produces a series of images from various angles. This data is used by a computer to generate a cross-sectional image. This two-dimensional (2D) scan, like one slice of bread, shows a "slice" of the inside of your body.
This process is repeated several times to produce a number of slices. The computer layers these scans to create a detailed image of your organs, bones, or blood vessels. A surgeon, for example, may use this type of scan to examine all sides of a tumour in preparation for surgery.
How Are CT Scanners Used?
A scan would most likely be performed in a hospital or radiology clinic. Your doctor may advise you not to eat or drink for a few hours before the procedure. You may also be required to wear a hospital gown and remove any metal objects, such as jewellery.
The CT scan will be performed by a radiology technologist. You will lie on a table inside a large, doughnut-shaped CT machine during the test. The X-rays rotate around your body as the table slowly moves through the scanner. Hearing a whirring or buzzing noise is normal. Because movement can cause the image to blur, you will be asked to remain completely still. At times, you may need to hold your breath.
The length of the scan depends on which parts of your body are being scanned. It could take anywhere from a few minutes to a half-hour. In most cases, you'll be able to return home on the same day.
What is It's Purpose?
CT scans are ordered by doctors for a variety of reasons, including:
CT scans can detect bone and joint issues such as complex fractures and tumours.
CT scans can detect or help doctors detect conditions such as cancer, heart disease, emphysema, or liver masses.
They depict internal injuries and bleeding caused by a car accident.
They can aid in the detection of a tumour, blood clot, excess fluid, or infection.
They are used by doctors to guide treatment plans and procedures like biopsies, surgeries, and radiation therapy.
Doctors can compare CT scans to see if certain treatments are effective. Scans of a tumour, for example, over time can reveal whether it is responding to chemotherapy or radiation.
What is a Contrast CT Scan?
Dense substances, such as bones, are easily visible in a CT scan. Soft tissues, on the other hand, do not show up as well. They may appear blurry in the image. A special dye known as a contrast material may be required to help them stand out. They absorb X-rays and appear white on scans, highlighting blood vessels, organs, and other structures.
Iodine or barium sulphate are common contrast materials. These drugs could be delivered to you in one of three ways:
Injection: The drugs are injected into a vein directly. This is done to enhance the visibility of your blood vessels, urinary tract, liver, or gallbladder in the image.
Drinking a liquid containing contrast material can improve scans of your digestive tract, which is the pathway of food through your body.
If your intestines are being scanned, contrast material can be injected into your rectum.
You'll need to drink plenty of fluids after the CT scan to help your kidneys remove the contrast material from your body.
Are there any dangers?
CT scans employ X-rays, which emit ionising radiation. According to research, this type of radiation can harm your DNA and cause cancer. However, the risk is still very low: your chances of developing a fatal cancer as a result of a CT scan are about one in 2,000.
However, the effects of radiation accumulate over time. As a result, your risk increases with each CT scan. Discuss the procedure's potential risks and benefits with your doctor, and inquire as to why the CT scan is required.
What are the Consequences?
The contrast materials cause allergic reactions in some people. The majority of the time, the reaction is minor. Itching or a rash may result. In a very small number of cases, the dye may cause a potentially fatal reaction. As a result, your doctor may want to monitor you for a short time after your CT scan. Inform your doctor about any medication, seafood, or iodine allergies you may have. If you have diabetes and are taking metformin, your doctor should also be aware. They will inform you whether you should discontinue your medication before or after your procedure. Medication before or after your procedure.