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Related Experiment Video

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Follow-Up Study on Fetal CT Radiation Dose in Japan: Validating the Decrease in Radiation Dose.

Osamu Miyazaki1, Hideaki Sawai2, Takahiro Yamada3

  • 11 Department of Radiology, National Center for Child Health and Development, 2-10-1 Okura, Setagaya-ku, Tokyo 157-8535, Japan.

AJR. American Journal of Roentgenology
|March 23, 2017
PubMed
Summary
This summary is machine-generated.

Fetal CT radiation dose has significantly decreased since 2011, with iterative reconstruction (IR) use increasing. The previous diagnostic reference level (DRL) study likely contributed to this reduction in radiation exposure.

Keywords:
CTdiagnostic reference levelfetusprenatal diagnosisskeletal dysplasia

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Area of Science:

  • Medical Imaging
  • Radiology
  • Radiation Dosimetry

Background:

  • Establishing a diagnostic reference level (DRL) for fetal CT radiation dose is crucial for patient safety.
  • Continuous evaluation of DRLs is necessary to track changes in radiation exposure.
  • Previous studies aimed to set a DRL for fetal CT examinations.

Purpose of the Study:

  • To evaluate changes in fetal CT radiation dose since the initial DRL determination in 2011.
  • To assess the impact of iterative reconstruction (IR) on fetal CT radiation dose.
  • To determine if the previously established DRL contributed to a decrease in radiation exposure.

Main Methods:

  • Collected data from 120 fetal CT examinations in 2015.
  • Summarized testing protocols and analyzed volume CT dose index (CTDIvol), dose-length product (DLP), and scan length.
  • Investigated trends in iterative reconstruction (IR) usage and tube voltage.

Main Results:

  • Fetal CT radiation doses (CTDIvol and DLP) significantly decreased compared to 2011 data.
  • The 75th percentile CTDIvol value decreased by 57% to 4.9 mGy.
  • Iterative reconstruction (IR) was used in 70% of sites, with significantly lower radiation doses observed in groups using IR.

Conclusions:

  • The previous DRL study appears to have successfully contributed to reducing fetal CT radiation doses.
  • The observed decrease in radiation dose is likely due to the implementation of the DRL and increased use of IR.
  • Continued monitoring of DRLs is recommended to ensure ongoing radiation safety in fetal CT imaging.