Frequently Asked Questions about Computerized Axial Tomography Scan
Computed tomography (CT) is a diagnostic procedure that uses special x-ray equipment to obtain cross-sectional pictures of the body. The article highlights frequently asked questions and answers about CAT scanning.
Modern diagnostic imaging technologies play an important role in providing quality healthcare to people. Radiologists use Computerized Axial Tomography (CT or CAT) scan to accurately diagnose and detect a condition, provide information about the extent of the disease and help in further treatment plan. This medical diagnostic scan uses special x-ray equipment to obtain cross-sectional pictures of the body. If you are planning to undergo a CT scan in Queens, NY area, the below discussed questions and answers can help you better understand this useful diagnostic procedure.
Q: What is Computed Tomography?
A: Computed Tomography (CT) is a diagnostic ultrasound imaging technique that uses special X-ray equipment to capture a complete 360-degree view of different parts of the body. Also called computerized axial tomography (CAT), this technique can show the size, shape and location of various organs, bones, tissues and even tumors within the body. It is often the most preferred way of diagnosing many cancers, such as liver, lung, and pancreatic cancers. The image allows a doctor to confirm the presence and location of a tumor, its size, and how much it has affected nearby tissue.
Q: How does a CAT scan work?
A: CT scanning is normally a non-invasive process that uses computer technology in combination with X-ray capabilities to capture images of the internal body for detailed physician review and analysis. A CT machine looks like a large donut with a portal through the middle. These machines use thin beams of radiation to view the internal structures of the body (which are absorbed on the other side of the portal). The information gathered is submitted into a computer system that calculates the images into different sections or layers. For some CT scans, physicians may recommend the use of contrast material which makes certain structures or masses to become clearer in images.
Q: Which parts of the body are scanned?
A: Parts of the body scanned through this imaging technique include –
* Soft tissues
* Pelvis
* Blood vessels
* Lungs
* Brain
* Abdomen
* Bones
* Heart
* Digestive organs
Q: What is the amount of radiation exposure involved?
A: CAT scanning involves a low dose of radiation, ranging from 2 to 10 mSv. Generally, CT is not recommended for pregnant women or children unless absolutely necessary.
Q: How long will the CT exam take?
A: The total time taken for scanning varies and may depend on the type of procedures performed. Generally, a normal exam gets completed within 10–15 minutes. More involved exams can take longer than 30 minutes.
Q: Can a bystander accompany the patient into the CT room?
A: Since CT scan imaging uses X-rays to capture images, only the person undergoing the procedure should be in the room during the imaging. Bystanders can wait outside the scanning room while the procedure is being performed.
Q: What can a person expect during the CT procedure?
A: As part of the CT procedure, the patient will lie on the exam table on his/her back and be slowly moved through the portal. The table slowly passes through the center of a large X-ray machine. From this point onwards, the patient might hear whirring sounds and see the machine spinning around them. Patients may be asked to hold their breath at times, to prevent blurring of the pictures.
In some cases, physicians may recommend using a contrast material/agent as this can highlight specific areas inside the body, resulting in a clearer picture. Contrast material can be administered through an IV, through the mouth or by injecting into the vein. The procedure does not cause any pain. However, lying still in the same position may be slightly uncomfortable for patients.
Q: Is there any special preparation required for CT exam?
A: The preparation required for a CT scan depends on the specific body part to be scanned. Patients should arrive at the medical imaging center at least 30 minutes before their scheduled appointment. They may be asked not to eat or drink anything for several hours before their scan, especially if a contrast material is to be used during the scanning. Patients should inform their physicians about their current medications (including prescriptions, over-the-counter medications and vitamins) and if they have any allergies, especially to contrast materials. They should also inform physicians about any recent illnesses or other medical conditions such as a history of heart disease, asthma, diabetes, kidney disease or thyroid problems. Women who are pregnant should inform their physician or technologist about the same. In addition, metal objects including jewelry, eyeglasses, dentures and hairpins should be removed prior to the exam as these may affect the CT images.
Q: What clothing should patients wear for the CT scan?
A: In most cases, patients may be asked to change into a hospital gown for scanning. Patients’ clothing for the scanning should be free of any type of metal, buttons, zippers and snaps.
Q: Can patients consume their regular medicines before a CT scan?
A: Yes, patients can take regular medicines before the CT scan, with the exception of diabetic medicines. Patients should make sure to consult their physician before the test for instructions.
Q: Are there any limitations for scanning?
A: CT scans are safe for patients with metal implants. However, a person (above 450 lbs of weight) may not fit in to the opening of the SCT scanner.
Q: Are there any special restrictions after the completion of the CT scanning?
A: After the CT exam is completed, patients can continue their normal routines and eat and drink normally. However, patients who have received contrast materials for their scanning should drink plenty of liquids for the next 24 hours.
