1. X-Ray Beams: The CT scanner rotates a series of X-ray beams around the body,
taking multiple images (or “slices”) from different angles as the patient moves
through a circular gantry.
2. Detectors: Detectors opposite the X-ray source capture the X-rays that pass
through the body. The amount of X-ray absorption varies by tissue density (e.g.,
bone absorbs more than soft tissue).
3. Image Reconstruction: A computer processes the X-ray data to create detailed 2D
cross-sectional images, which can be stacked to form 3D models.
4. Contrast (Optional): Iodine-based contrast dye may be injected or swallowed to
highlight blood vessels, organs, or abnormalities.
Key Features:
Radiation: CT uses ionizing radiation, which carries a small risk, especially with
repeated scans.
Speed: Scans are fast, often taking 5–15 minutes, making CT ideal for
emergencies (e.g., trauma or stroke).
Versatility: Excellent for imaging bones, chest, abdomen, and detecting conditions like fractures, lung issues, or cancers.
Environment: The scanner is a wide, open ring, less confining than an MRI, and quieter.
Safety Notes: CT scans are generally safe for patients with implants, as they don’t use magnetic fields. However, radiation exposure is a concern, particularly for pregnant women or those needing multiple scans. Contrast dye can cause allergic reactions or kidney issues in some patients.
