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🩻 How CT Scans Work

Follow an X-ray beam from rotating gantry to projections, reconstruction, calibrated slices, and the protocol choices that shape CT images.

lessons

~12 min

to learn

🤖 Technology

subject

Adults

level

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What you’ll learn

The X-ray CircleExplain how rotating X-rays and detectors collect projection measurements through the body.CT gathers many angle-dependent attenuation measurements while the source and patient table move through the gantry.
From Projections to PixelsDescribe how projection data become voxel values through filtered back projection and iterative reconstruction.Reconstruction uses overlapping ray constraints and mathematical models to estimate the scanned volume.
Reading the Slice StackInterpret CT numbers, windowing, reformats, and volume renderings as views of reconstructed data.CT displays can emphasize tissues, resample planes, and build 3D views from the same reconstructed voxels.
Dose and DecisionExplain why CT protocols balance diagnostic information, radiation dose, contrast, and patient-specific factors.A useful CT exam is justified and optimized for its clinical question rather than judged by dose or detail alone.

Questions this course answers

Why does a CT scanner collect projections from many angles?

Each projection measures line integrals along different paths, and their combination lets reconstruction estimate the internal structure.

Put this simplified CT image chain in order.

CT first acquires rays, organizes the measurements, reconstructs the volume, and then displays selected views.

Match each CT term to its main role.

These terms describe different layers of the workflow: raw-data display, calibrated values, and display settings.

Grounded in trusted sources

National Institute of Biomedical Imaging and Bioengineering, Computed Tomography (CT): https://www.nibib.nih.gov/science-education/science-topics/computed-tomography-ct
U.S. Food and Drug Administration, Computed Tomography (CT): https://www.fda.gov/radiation-emitting-products/radiation-emitting-products-and-procedures/medical-imaging/computed-tomography-ct
U.S. Food and Drug Administration, Medical X-ray Imaging: https://www.fda.gov/radiation-emitting-products/medical-imaging/medical-x-ray-imaging
U.S. Food and Drug Administration, What are the Radiation Risks from CT?: https://www.fda.gov/radiation-emitting-products/medical-x-ray-imaging/what-are-radiation-risks-ct
RadiologyInfo, Body CT: https://www.radiologyinfo.org/en/info/bodyct
Wikimedia Commons, Sinogram and sample image of computed tomography of the jaw.jpg: https://commons.wikimedia.org/wiki/File:Sinogram_and_sample_image_of_computed_tomography_of_the_jaw.jpg
National Center for Biotechnology Information, Medical Imaging Systems, Chapter 8 Computed Tomography: https://www.ncbi.nlm.nih.gov/books/NBK546157/
American College of Radiology, Practice Parameter for the Performance of CT of the Thorax: https://www.acr.org/-/media/ACR/Files/Practice-Parameters/CT-Thoracic.pdf

Every Wunder lesson is built from real, reputable sources — never invented.

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