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Helical CT image acquisition

Dr Matt A. Morgan ◉ et al.

Helical ("spiral") CT image acquisition was a major advance on the earlier stepwise ("stop and shoot") method.

With helical CT, the patient is moved through a rotating x-ray beam and detector set. From the perspective of the patient, the x-ray beam from the CT traces a helical path. The helical path results in a three-dimensional data set, which can then be reconstructed into sequential images for a stack.

Helical CT allows a scan to be performed in a single breath-hold.

Most modern CT protocols use helical acquisition due to its speed and because it reduces misregistration from patient movement or breathing. Sequential scanning (step-and-shoot) acquisition is still used in some situations (e.g. helical acquisition can lead to artifacts on head CT).

The radiation dose administered during helical acquisition depends on the speed of the patient through the scanner, also known as the pitch.

Quiz questions

References

Physics and imaging technology: CT

computed tomography (CT)
- CT technology
- dual energy CT
  - clinical applications of dual energy CT
    - virtual non-contrast imaging
    - abdominal
    - vascular
    - urinary system
    - musculoskeletal
- CT image reconstruction
- CT image quality
- CT dose
- CT contrast medium
  - iodinated contrast media
- coronary CT angiography
- CT artifacts
  - patient-based artifacts
    - motion artifact
    - transient interruption of contrast
  - physics-based artifacts
  - hardware-based artifacts
    - ring artifact
    - tube arcing
    - out of field artifact
    - air bubble artifact
    - helical and multichannel artifacts
- CT safety
- history of CT
  - Godfrey N Hounsfield

Article information

rID: 38221

Section: Physics

Tag: ct, physics

Synonyms or Alternate Spellings:

Helical CT scanning
Spiral CT
Spiral CT scanning
Helical CT scan

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