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PET/CT |
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For information on radiation safety, click here.
 | PET/CT combines two scanning techniques into one exam: PET (Positron Emission Tomography) and CT (Computed Tomography). PET shows different functions in the body, like cell activity; CT shows detailed structural anatomy. Both of these scans are performed at the same time with the PET/CT machine, during one appointment.
The results from the PET and CT scans are merged and form highly-defined, three-dimensional images that provide detailed information.
PET/CT is primarily used in cancer diagnosis and staging. It provides information that may help determine and improve any potential treatments. |
The information obtained from a PET/CT scan is digitally processed, stored and displayed on a specialized computer system. The digital images and data are then studied and analyzed by a subspecialty board-certified radiologist, a doctor who has extensive training and expertise in medical imaging.
Patient Preparation
Preparation for the exam will vary depending on the reason for the PET scan, but in general these guidelines should be followed:
General
Arrive 15 minutes early to complete registration. Wear comfortable clothing. Avoid metal buttons and leave jewelry at home.
Diet Do not eat 4 hours prior to your exam. Drink plenty of fluids the day before and up to 4 hours prior to your exam. You may drink water up to the time of your exam. Avoid nicotine and caffeine 12 hours prior to your exam. Eat a high protein/restricted carbohydrate meal the evening before your exam. Avoid potatoes, pasta, rice,
bread, sugar, desserts and juice. Avoid all nutritional supplements (Ensure, Boost, etc.) 8 hours prior to your exam.
Activity Refrain from strenuous exercise 24 hours before your exam.
Medication Hold all diuretic medication (water pills) the day of your exam. Take all other normally scheduled medication, with water, if they can be tolerated on an empty stomach.
Diabetic Patients Non-insulin dependent: Take diabetic medication with water in the a.m. of your exam. No oral diabetic medication for two hours prior to the appointment time. Insulin dependent: No insulin for two hours prior to your appointment time.
Important note: FDG is formulated and ordered specifically for each patient and exam requested. FDG can only be used within a short period of time, so we must be notified 48 hours in advanced if you have to cancel your appointment. Patient Experience
After you arrive, you will have a brief discussion with the imaging technologist, you will be weighted and a small blood sample will be taken to check your blood sugar level. An intravenous (IV) line will be placed in your arm and the technologist will inject a low-dose radiolabeled sugar called FDG. This tracer material circulates through your body and will be metabolized, or "used," by your cells and organs.
Some cells and many diseases use this sugar more than others, and PET measures these differences. For this reason, after the injection of FDG you will be taken to a special room where you will remain relaxed for one hour while the sugar circulates throughout your body.
For the scanning portion, you will lie on a cushioned, moveable table and be positioned comfortably with bolsters. The table will move slowly through the machine during the scan. You will hear slight buzzing, clicking and whiring sounds as the machine captures the images. For the best quality images, you need to be as still as possible during the exam You may be asked to hold your breath for approximately 15-20 seconds while the images are captured. Some people fall asleep during the scan, which will take approximately one hour.
The imaging technologist will be outside of the room and is immediately available at all times. You will be in full view of the technologist by means of a window and a video camera. You will communicate with the technologist during the exam via a microphone.
After Your Exam
You can leave immediately after your scan. Your activity will not be restricted. You may drive, resume your normal diet, exercise and take all prescribed medications.
As an extra precaution, due to the radiolabeled sugar that was injected, avoid getting close to an infant or anyone who is pregnant for the remainder of the day. Be sure to drink lots of fluids to flush the remaining sugar out of your system.
Your images will be interpreted by a board-certified radiologist specializing in body imaging. The findings will be sent to your healthcare provider. Your healthcare provider will contact you to discuss the results.
Cost
With an appropriate healthcare provider referral, most insurance plans consider this a covered service, but check with your insurance company. Some insurance companies may require a prior authorization.
PET/CT is available at: Coon Rapids |
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