CT Scans FAQ
How does a CT scan work?
The CT scanner uses x-rays to produce cross sectional images of the human body.
What are the benefits of a CT scan?
- Precise staging of a disease.
- Safe, non-invasive diagnostic procedure.
- Provides detailed diagnostic information.
- Shorter time for definitive diagnosis.
- Earlier detection of disease with fewer invasive diagnostic procedures.
- Can result in less intensive surgery and/or avoidance of some surgeries.
- Identification of distant tumors.
What should I do prior to the CT scan?
- Tell your doctor and technologist if you are diabetic.
- Tell your doctor and technologist if you are allergic to IV contrast (x-ray dye).
- Tell your doctor if you are pregnant, think you might be pregnant or if you are a nursing mother.
- Wear comfortable clothing in layers.
- You may wear your hearing aid, glasses and dentures to the PET/CT center but leave valuables at home.
- Take any prescribed medications on the day of your test unless instructed differently by your doctor.
- Do not eat for at least four hours before your scan.
- Drink only clear liquids for four hours prior to your exam.
- Increase water intake starting the night before the exam.
- Depending on the type of exam you are having, you may be asked to drink diluted barium before your exam.
Can I eat or drink before my scan?
Typically, you will be asked to not eat or drink anything except water for at least four hours before your scan.
How long will the scan last?
You can expect to be in the CT area for approximately an hour. The actual scan takes about 15 minutes.
How do I prepare for the scan?
Different tests require different preparations. You may be asked to drink an oral contrast agent which may be diluted barium or diluted IV contrast. The oral contrast must be ingested approximately 90 minutes (1-1/2 hours) prior to the time you are scanned. The oral contrast allows the Radiologist to distinguish your normal intestines from abnormalities in the abdomen and pelvis.
Will the exam require an injection?
Other tests may require you to only drink clear liquids 4 hours prior to your exam or have some lab work done. Some exams require the injection of IV contrast material administered by a technician through an IV.
This allows the Radiologist to see your organs and soft tissue with more clarity. This contrast material may cause a warm sensation in your body; it will only last momentarily and will not cause any pain.
What do I need to tell my doctor or technologist?
If you have a history of prior allergic reaction, please let the doctor or technologist know.
What will the test be like?
The CT machine looks like a large square doughnut and only covers the area that is being examined. Once the technologist positions you on the table the scan will begin. During the exam you will be in the room alone; however, your technologist will be able to see and hear you throughout the whole procedure. Each CT room has pictorial “skylights” above the scanner to help you stay relaxed and comfortable.
How will I feel after the test?
You will be able to return to normal activities after your scan.
How will my physician get the results?
After your scan is completed, a Radiologist will study the exam by looking at the images on a computer using the Picture Archiving & Communication System (PACS). The Radiologist will issue a report and a copy of that report will be sent to your physician. Your physician’s office will then contact you with the results. Films of the exam can also be produced and sent to your physician.