American Association of Physicists in Medicine (AAPM)

The AAPM is a professional organization whose members include board certified
medical physicists who specialize in the safe and effective use of radiation in medicine.

AAPM Presents the Following Educational Video.  

  • CT scan protocols available from the AAPM at
  • CT Scan Dose Check Education Slides available at

*: CT refers to Computed Tomography.

Learn about Computed Tomography (CT) from FDA

How a CT system works:

0904-CT Fan Beam and Patient in a CT Imaging System
Drawing of CT fan beam (left) and patient in a CT imaging system
  • A motorized table moves the patient through a circular opening in the CT imaging system.
  • While the patient is inside the opening, an X-ray source and a detector assembly within the system rotate around the patient. A single rotation typically takes a second or less. During rotation the X-ray source produces a narrow, fan-shaped beam of X-rays that passes through a section of the patient’s body.
  • Detectors in rows opposite the X-ray source register the X-rays that pass through the patient’s body as a snapshot in the process of creating an image. Many different “snapshots” (at many angles through the patient) are collected during one complete rotation.
  • For each rotation of the X-ray source and detector assembly, the image data are sent to a computer to reconstruct all of the individual “snapshots” into one or multiple cross-sectional images (slices) of the internal organs and tissues.

Read more information from FDA at Computed Tomography here

Unfortunate Cases of Patient Injury due to Improper CT Scan
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