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Related Experiment Video

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Image quality and radiation doses in abdominal CT: A multicenter study.

Linn Andrea Gjerberg Røhme1, Tora Hilde Fjeld Homme1, Elin Cathrine Kiperberg Johansen2

  • 1Department of Life Sciences and Health, Faculty of Health Science, Oslo Metropolitan University Oslo, Norway.

European Journal of Radiology
|July 30, 2024
PubMed
Summary

Radiation dose and image quality varied significantly across CT scanners for abdominal scans. Higher radiation doses did not consistently improve image quality, highlighting the need for optimization.

Keywords:
Abdominal CTComputed TomographyImage qualityMulticenter studyPhantom studyRadiation doses

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Area of Science:

  • Radiology
  • Medical Imaging
  • Radiation Dose Optimization

Background:

  • Computed Tomography (CT) is crucial for diagnosing acute abdominal conditions.
  • Standardizing image quality and radiation dose is essential for consistent patient care.
  • Benchmarking current practices can identify areas for improvement in CT examinations.

Purpose of the Study:

  • To evaluate and compare image quality and radiation doses in abdominal CT scans.
  • To benchmark performance across various CT scanner manufacturers and laboratories.
  • To identify variations in imaging protocols and their impact on diagnostic quality.

Main Methods:

  • An anthropomorphic phantom was scanned on 40 CT scanners from 4 vendors at 33 sites.
  • Quantitative image quality assessed using signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR).
  • Qualitative image quality evaluated by radiologists using a Likert scale; radiation dose measured by CTDIvol.

Main Results:

  • CTDIvol ranged from 3.5 to 12 mGy, with significant variations observed.
  • SNR in liver parenchyma ranged from 4.4 to 14.4; CNR ranged from 2.7 to 11.2.
  • A weak correlation (r=0.270) between CTDIvol and CNR indicated higher doses do not guarantee better image quality.

Conclusions:

  • Substantial variability exists in radiation dose and image quality for abdominal CT.
  • The weak correlation between dose and CNR suggests current protocols may not be optimized.
  • Systematic assessment and optimization of CT protocols are needed to balance image quality and radiation exposure.