CT Scan (Computed Tomography)

A CT scan uses X-ray beams combined with computer processing to generate detailed cross-sectional images of the body. Unlike standard X-rays, which show overlapping structures, CT scans create layered “slices” that reveal organs, bones, blood vessels, and soft tissues with much higher clarity.

Doctors use CT scans to:

• Detect injuries such as fractures or internal bleeding after trauma.
• Diagnose tumors, infections, and vascular disease.
• Guide biopsies, radiation therapy planning, or minimally invasive procedures.
• Monitor the effectiveness of ongoing treatments, such as chemotherapy.

• Depending on the type of CT scan, you may need to fast for several hours before the exam, particularly if contrast dye will be used.
• If contrast is needed, you may receive it by mouth, intravenously, or both. Inform your care team if you have allergies, asthma, kidney problems, or diabetes, as these may affect contrast safety.
• Remove any metallic items (jewelry, hairpins, eyeglasses, removable dental work), as metal can interfere with imaging.
• Wear loose clothing or a gown provided at the facility.

You will lie on a motorized table that slides into the CT scanner, which resembles a large donut. The scanner rotates around you, capturing multiple images. You may be asked to hold your breath briefly to prevent motion blur. If intravenous contrast is given, you might feel a warm sensation or metallic taste, which usually passes quickly. The exam is painless and generally lasts 10–30 minutes, depending on the area being studied.

• Radiation exposure: CT uses more radiation than a standard X-ray. For most adults, the benefit outweighs the small associated risk.
• Contrast-related risks: Rare allergic reactions can occur. Patients with impaired kidney function may have a higher risk of contrast-induced nephropathy.
• Pregnancy considerations: CT is usually avoided in pregnancy unless absolutely necessary.

A radiologist interprets the images and sends a detailed report to your doctor. Your provider will explain the findings in context with your medical history and symptoms, and may recommend follow-up imaging, additional tests, or treatment based on results.