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Related Experiment Videos

Dose evaluation and effective dose estimation from multi detector CT.

Kanae Nishizawa1, Masaki Matsumoto, Kazuo Iwai

  • 1Department of Medical Physics, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan. nisizawa@nirs.go.jp

Igaku Butsuri : Nihon Igaku Butsuri Gakkai Kikanshi = Japanese Journal of Medical Physics : an Official Journal of Japan Society of Medical Physics
|May 27, 2003
PubMed
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Multi-detector row computed tomography (MDCT) enables rapid scanning, but patient radiation doses must be assessed. This study evaluated MDCT radiation exposure for chest and abdomen-pelvis scans, finding significant variation and potential for dose reduction.

Area of Science:

  • Medical Imaging
  • Radiological Physics
  • Radiation Dosimetry

Background:

  • Computed tomography (CT) technology has advanced significantly with the introduction of multi-detector row CT (MDCT) enabling faster scanning.
  • Assessing patient radiation exposure is crucial for the safe and effective clinical implementation of MDCT, given the inherently high doses associated with CT examinations.

Purpose of the Study:

  • To evaluate patient radiation doses associated with three types of multi-detector row CT scanners.
  • To determine effective and surface doses for chest and abdomen-pelvis CT examinations performed under typical clinical conditions.

Main Methods:

  • Patient doses were measured for chest and abdomen-pelvis scans using three different MDCT devices.
  • Scanning parameters mimicked those used in actual clinical practice.

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Main Results:

  • Effective doses ranged from 9.4-28 mSv for chest scans and 13-28 mSv for abdomen-pelvis scans.
  • Average surface doses varied between 16-43 mGy (chest) and 20-37 mGy (abdomen-pelvis), with a maximum of 57 mGy for abdomen-pelvis.
  • Dose varied based on scanning methods and imaging conditions (e.g., tube current, slice thickness).

Conclusions:

  • Significant variations in patient radiation doses were observed across different MDCT scanners and examination types.
  • There is potential for dose reduction in MDCT examinations through careful adjustment of scanning parameters.