What is a CT?
A CT (computerized tomography) scan, also called a “CAT” scan, is a safe, painless imaging procedure that uses special x-ray technology to take multiple pictures of the inside of your body from various angles.
The CT images allow the physician to visualize any abnormalities in addition to showing the size and shape of organs, tumors and other tissues. Your doctor will use CT scans to help detect, measure and track any changes in cancer growth. CT scans also help “stage” the cancer (if and where the cancer has spread).
How does it work?
A CT scan simultaneously takes pictures of the inside of your body from many different angles. The CT machine rotates around your body and creates what we call “slices.” The slices or scans can be processed to create a three-dimensional image of your body both inside and out.
The scanner sends the series of images to a computer, which combines the multiple pictures to give your doctor a cross-sectional view of the inside of your body from any direction. CT scans typically provide more detail and clarity than conventional x-rays and can image large areas of the body quickly and accurately.
CT Simulation
CT scanning technology is used in a process called “simulation.” Before your radiation treatment begins, your radiation oncologist may use a CT scanner to determine the best body position and measurement of body structures for the most accurate delivery of radiation beams.
Your doctor can make a special mold or cast to make it easier to comfortably hold still and replicate your exact position during your actual treatment. Sometimes your doctor will use images to create devices called “blocks” that shield your healthy cells from the radiation while allowing the beam to treat the cancer.
What is the difference between a CT and a PET/CT?
A PET/CT uses a small amount of radioactive material that is absorbed by the body. A special camera measures normal tissue against brightly colored areas that may be cancerous. Possible cancers are “bright spots” on the images.
The CT part of a PET is done primarily for body alignment and reference and is not as clear as a regular CT scan. Typically a doctor will order a PET/CT in addition to a CT.
CT at Cancer Care Northwest
CT technology is available at the Downtown Spokane, North Spokane (Holland Ave.), South Spokane (Sherman Ave.) and Spokane Valley (Vercler Rd.) treatment centers. Additionally, the Coeur d'Alene, Post Falls and Sacred Heart treatment centers offer CT technology for simulation purposes only, to help design the best and most precise radiation treatment plan for you. Our scanners are large bore CT scanners, which are designed to allow you to be in a comfortable, relaxed position during the procedure.
