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[Absorbed dose in CT: comparison by CT dose index].

Kenji Yamamoto1, Takashi Andou, Hiroshi Akazawa

  • 1Department of Radiology, Toyoshina Red Cross Hospital, Japan.

Nihon Hoshasen Gijutsu Gakkai Zasshi
|December 7, 2002
PubMed
Summary

CT scanner absorbed dose varies significantly between units, with multi-slice scanners delivering higher doses than single-slice. Reducing helical scanning pitch also increases patient radiation exposure.

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Area of Science:

  • Medical Physics
  • Radiological Imaging
  • Radiation Dosimetry

Background:

  • Limited data exists on absorbed doses for modern CT scanners with advanced scanning capabilities.
  • Widespread adoption of multi-slice CT (MSCT) necessitates understanding dose variations across different units.

Purpose of the Study:

  • To compare and investigate dose indexes across various CT units.
  • To evaluate the impact of scanning parameters on absorbed dose in CT examinations.

Main Methods:

  • Absorbed dose measurements were conducted on CT units in Nagano Prefecture, Japan.
  • Phantom measurements were used to assess dose under conventional and helical scanning modes.
  • Dose indexes were compared between single-slice and multi-slice CT units, and across different manufacturers.

Main Results:

  • A proportional relationship was observed between phantom absorbed dose and exposure mAs values in conventional scanning.
  • Significant variations in absorbed dose (up to 2.1-fold) were found among individual CT units.
  • MSCT units delivered 1.3 to 1.5 times higher absorbed doses than conventional single-slice CT units under similar conditions.
  • Reducing scanning pitch in helical scanning led to an increased absorbed dose at the phantom's center.

Conclusions:

  • CT unit absorbed doses exhibit considerable variability, highlighting the need for consistent quality control.
  • Multi-slice CT technology generally results in higher absorbed doses compared to single-slice CT.
  • Scanning parameters, such as pitch in helical mode, critically influence radiation dose, requiring careful optimization.

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