Computed Tomography (CT Scan)

Fast, detailed imaging for clear answers

A CT scan is one of the fastest and most versatile imaging exams in modern medicine. In just a few minutes it can produce detailed cross-sectional images that help your doctor see bones, organs, blood vessels, and soft tissue in three dimensions.

What Is a CT Scan?

A CT scanner is a doughnut-shaped machine that rotates a low-dose X-ray beam around your body while you lie on a padded table.

A computer then combines hundreds of individual images into detailed 3D views, slice by slice.

Because CT captures images in seconds, it is especially valuable in emergencies, for lung and abdominal imaging, and for procedures that need fine anatomic detail.

Some CT exams use contrast dye, given by mouth, rectally, or through an IV, to make specific tissues, blood vessels, or the digestive tract more visible.

Your care team will tell you in advance whether your exam requires contrast and what to do to prepare.

What a CT Scan Can Help Detect

CT is often used when doctors need speed and detail together. Common uses include:

Emergency evaluation of trauma, internal bleeding, and head injury

Detecting tumors, masses, and cancer staging

Lung conditions including pneumonia, pulmonary embolism, and low-dose lung cancer screening

Abdominal pain, appendicitis, kidney stones, and bowel obstructions

Heart imaging, including coronary calcium scoring and CT angiography of the arteries

Complex fractures, spine injuries, and pre-surgical planning

Guidance for biopsies and minimally invasive procedures

Timeline – 8 Steps

How to Prepare for
Your CT

Some CT exams require no preparation, while others may involve a few extra steps. Your imaging center will provide exact instructions for your exam, but here are some general guidelines to expect.

Step 1

Prepare for contrast if needed

If your exam uses IV (intravenous) contrast, you will likely be asked to avoid solid food for 4 hours beforehand, but your imaging center will confirm.

If your exam uses oral contrast, the imaging center may ask you to arrive 60–90 minutes early to drink it before the scan.

Step 2

Use your OneImaging Card

Your OneImaging Digital Payment Card covers the full cost of your exam at check-in.

Do not present your insurance card.
Learn how to use your card here.

Step 3

Bring requested records

Bring a list of current medications and any prior imaging AND reports on disc if requested.

Step 4

Dress for comfort

Wear loose, comfortable clothing without metal. You may be asked to change into a gown.

Step 5

Share important details

Tell your team if you are pregnant or breastfeeding.

Step 6

Remove metal items

Remove jewelry, eyeglasses, and hair accessories before your scan.

What to Expect During
Your CT

Knowing what happens during your CT can help you feel more prepared and comfortable.

Comfortable, guided positioning

You will lie comfortably on a padded table that moves slowly through a circular scanner. You may be asked to hold your breath for a few seconds and remain still while images are being captured.

Fast imaging with precise detail

The scanner rotates quietly around you, capturing detailed images in seconds. These images are combined into precise 3D views that help your care team evaluate your condition.

Done in minutes

Most CT scans take just a few minutes, though your visit may last 10 to 15 minutes to allow time for preparation, positioning, and any final instructions before or after the scan.

Receiving contrast dye? Some CT exams include contrast to improve visibility. Your care team will explain exactly what to expect beforehand.

Frequently Asked Questions

How long will the exam take?

The scan itself is usually a few seconds to a few minutes. Total visit time is typically 30 to 60 minutes, longer if oral contrast is involved.

Is a CT scan safe?

Yes. CT scans are quick, non-invasive, and use low levels of X-ray radiation. Modern technology has significantly reduced radiation exposure while improving image quality.

Is a CT scan the same as a CAT scan?

Yes. “CAT” is the older term (computed axial tomography); today most clinicians simply say CT.

How will I get my results?

The imaging center will send your imaging report directly to your ordering physician. As a OneImaging member, you will also receive a copy of your report in your OneImaging account - we will notify you when your report is available.

Questions about your exam or need help scheduling your exam?

Schedule Online

Call us at (833) 619-0837

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