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Eur Radiol. 2018 Mar;28(3):1054-1065. doi: 10.1007/s00330-017-5000-z. Epub 2017 Sep 8.

Assessment of CT dose to the fetus and pregnant female patient using patient-specific computational models.

Author information

1
Department of Medical Imaging and Information Sciences, Geneva University Hospital, Geneva, Switzerland.
2
Department of Medical Imaging and Information Sciences, Geneva University Hospital, Geneva, Switzerland. habib.zaidi@hcuge.ch.
3
Geneva Neuroscience Center, Geneva University, Geneva, Switzerland. habib.zaidi@hcuge.ch.
4
Department of Nuclear Medicine and Molecular Imaging, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands. habib.zaidi@hcuge.ch.
5
Department of Nuclear Medicine, University of Southern Denmark, DK-500, Odense, Denmark. habib.zaidi@hcuge.ch.
6
Division of Nuclear Medicine and Molecular Imaging, Geneva University Hospital, CH-1211, Geneva, Switzerland. habib.zaidi@hcuge.ch.

Abstract

PURPOSE:

This work provides detailed estimates of the foetal dose from diagnostic CT imaging of pregnant patients to enable the assessment of the diagnostic benefits considering the associated radiation risks.

MATERIALS AND METHODS:

To produce realistic biological and physical representations of pregnant patients and the embedded foetus, we developed a methodology for construction of patient-specific voxel-based computational phantoms based on existing standardised hybrid computational pregnant female phantoms. We estimated the maternal absorbed dose and foetal organ dose for 30 pregnant patients referred to the emergency unit of Geneva University Hospital for abdominal CT scans.

RESULTS:

The effective dose to the mother varied from 1.1 mSv to 2.0 mSv with an average of 1.6 mSv, while commercial dose-tracking software reported an average effective dose of 1.9 mSv (range 1.7-2.3 mSv). The foetal dose normalised to CTDIvol varies between 0.85 and 1.63 with an average of 1.17.

CONCLUSION:

The methodology for construction of personalised computational models can be exploited to estimate the patient-specific radiation dose from CT imaging procedures. Likewise, the dosimetric data can be used for assessment of the radiation risks to pregnant patients and the foetus from various CT scanning protocols, thus guiding the decision-making process.

KEY POINTS:

• In CT examinations, the absorbed dose is non-uniformly distributed within foetal organs. • This work reports, for the first time, estimates of foetal organ-level dose. • The foetal brain and skeleton doses present significant correlation with gestational age. • The conceptus dose normalised to CTDI vol varies between 0.85 and 1.63. • The developed methodology is adequate for patient-specific CT radiation dosimetry.

KEYWORDS:

CT; Foetal dose; Monte Carlo simulation; Pregnant female models; Radiation dosimetry

PMID:
28887589
DOI:
10.1007/s00330-017-5000-z
[Indexed for MEDLINE]

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