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How are CT scans made?

Computed tomography (CT) uses X-ray photons for image production, with digital reconstruction.

This imaging procedure uses the CT scanner, which consists of an X-ray tube and detectors. The tube produces an X-ray beam that passes through the patient and is captured by the detectors, followed by reconstruction to create a 2D or 3D image. Contrast media such as intravenous and oral contrast agents may be employed during a CT study.

Common CT clinical applications include:

  • Abdominal CT
  • Brain/Cranial/Head/Neck CT
  • Cardiac CT
  • Chest/Mediastinum/High Resolution CT
  • CT Angiography
  • CT Colonography
  • CT Myelography
  • CT Urography
  • Extremities
  • Pelvic CT
  • Quantitative Computed Tomography, QCT Densitometry

As with plain radiography, CT uses X-ray radiation to produce images; radiation doses from computed tomography are higher because of multiple exposures.

Disclaimer: We do not assume responsibility for the use of the provided information or its interpretation. Our efforts are towards providing current and reliable information; however these should not be considered, or used as a substitute for diagnosis or treatment.

Source: https://www.cedars-sinai.edu/Education/Medical-Library/