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Dose reduction in multidetector CT using attenuation-based online tube current modulation.

Denis Tack1, Viviane De Maertelaer, Pierre Alain Gevenois

  • 1Department of Radiology, Centre Hospitalier Universitaire de Charleroi, Boulevard Janson, 92, B-6000-Charleroi, Belgium.

AJR. American Journal of Roentgenology
|July 24, 2003
PubMed
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Attenuation-based online tube current modulation can reduce radiation dose by up to 20% in adult trunk CT scans. While effective, physicians should prioritize adjusting milliampere-second (mAs) presets for primary radiation dose reduction.

Area of Science:

  • Radiology
  • Medical Imaging
  • Radiation Oncology

Background:

  • Multidetector CT (MDCT) involves radiation exposure.
  • Optimizing radiation dose is crucial in medical imaging.
  • Tube current modulation aims to reduce patient dose.

Purpose of the Study:

  • To quantify radiation dose reduction from attenuation-based online tube current modulation in adult trunk MDCT.
  • To analyze dose savings based on effective milliampere-second (mAs) presets, sex, and body mass index.

Main Methods:

  • 120 adult patients underwent thoracic and abdominal MDCT with attenuation-based online tube current modulation.
  • Consecutive acquisitions were performed at standard and two lower effective mAs presets.
  • Mean percentage effective mAs reductions were compared across presets, sex, and body mass index.

Related Experiment Videos

Main Results:

  • Mean effective mAs reduction was 16.9% for the chest and 20.0% for the abdomen.
  • Dose reductions varied significantly by sex (p < 0.003 for chest, p < 0.002 for abdomen).
  • No significant difference in dose reduction was observed across different mAs presets or body mass index.

Conclusions:

  • Attenuation-based online tube current modulation is a valuable secondary tool for reducing radiation dose in adult trunk MDCT, saving up to 20%.
  • Physician-led adjustments to mAs presets should remain the primary strategy for radiation dose reduction.
  • The technique's effectiveness is consistent across various mAs presets but influenced by patient sex.