::: AHI - CT FAQs :::

What is CT?

CT stands for Computed Tomography, which is widely called a CAT scan. Based on x-ray technology, it creates three-dimensional, computerized images of internal tissues and organs. Unlike traditional x-rays, however, CT images reveal overlapping parts of the body.

What are the advantages of a CT scan compared to an MRI?

A key advantage of CT is its ability to show detailed images of bones, blood vessels, and soft tissue in the same image. Bones in the image don’[t obscure the underlying tissues. A CT can also reveal tumors and measure a tumor’s size and location. CT is considered the best method of diagnosing different kinds of cancers. It is also commonly used in diagnosing vascular diseases, detecting osteoporosis, and identifying traumatic injuries to internal organs.
Another advantage of CT: The procedure is faster and costs much less than an MRI.

Is a CT safe?

While the patient is exposed to radiation from x-rays, the amount of exposure is considerably less than that of a normal x-ray. In fact, the amount of radiation received from a CT of the head and brain is about the same as the amount of natural radiation exposure received in the environment during a year.

When and why is “dye” used?

Whether or not you need a contrasting liquid or injection depends on the type of study your physician has ordered. A contrasting agent containing iodine, often called “dye,” helps the radiologist to see more definition of the tissues and to visualize the blood supply to internal organs. The contrasting agent can be administered by our staff intravenously or as a drink that you consume several hours before the exam.

The iodine-containing “dyes” are generally quite safe. Our staff will screen your medical history to determine if there is any risk of adverse reactions to the contrasting agent.

How does a CT scan work?

The patient lies comfortably still on a flat padded table, which moves steadily through the center of a donut-shaped x-ray machine. X-ray beams from a number of positions are aimed at the area being studied. A special detector measures the amount of absorbed radiation. This data is transformed by a computer into a digital image, displayed as a cross-section of the x-rayed area on a computer screen.

How should I prepare for the exam?

Preparation can vary according to the type of CT exam, whether or not you will be receiving a contrasting agent, and your medical history. AHI will provide full instructions before your exam.

Can I drive home after the CT?

CT requires no sedation and therefore you will be able to drive immediately after the exam, even if you received a contrasting agent.

How long does it take for my physician to get the results of the examination?

The radiologist will review and interpret your CT examination upon completion. Within 24 hours, your physician will have a written report and copies of the film for visual inspection of the findings.