Document Detail

Radiation dose to the fetus for pregnant patients undergoing multidetector CT imaging: Monte Carlo simulations estimating fetal dose for a range of gestational age and patient size.
MedLine Citation:
PMID:  18796678     Owner:  NLM     Status:  MEDLINE    
PURPOSE: To use Monte Carlo simulations of a current-technology multidetector computed tomographic (CT) scanner to investigate fetal radiation dose resulting from an abdominal and pelvic examination for a range of actual patient anatomies that include variation in gestational age and maternal size.
MATERIALS AND METHODS: Institutional review board approval was obtained for this HIPAA-compliant retrospective study. Twenty-four models of maternal and fetal anatomy were created from image data from pregnant patients who had previously undergone clinically indicated CT examination. Gestational age ranged from less than 5 weeks to 36 weeks. Simulated helical scans of the abdominal and pelvic region were performed, and a normalized dose (in milligrays per 100 mAs) was calculated for each fetus. Stepwise multiple linear regression was performed to analyze the correlation of dose with gestational age and anatomic measurements of maternal size and fetal location. Results were compared with several existing fetal dose estimation methods.
RESULTS: Normalized fetal dose estimates from the Monte Carlo simulations ranged from 7.3 to 14.3 mGy/100 mAs, with an average of 10.8 mGy/100 mAs. Previous methods yielded values of 10-14 mGy/100 mAs. The correlation between gestational age and fetal dose was not significant (P = .543). Normalized fetal dose decreased linearly with increasing patient perimeter (R(2) = 0.681, P < .001), and a two-factor model with patient perimeter and fetal depth demonstrated a strong correlation with fetal dose (R(2) = 0.799, P < .002).
CONCLUSION: A method for the estimation of fetal dose from models of actual patient anatomy that represented a range of gestational age and patient size was developed. Fetal dose correlated with maternal perimeter and varied more than previously recognized. This correlation improves when maternal size and fetal depth are combined.
Erin Angel; Clinton V Wellnitz; Mitchell M Goodsitt; Nazanin Yaghmai; John J DeMarco; Christopher H Cagnon; James W Sayre; Dianna D Cody; Donna M Stevens; Andrew N Primak; Cynthia H McCollough; Michael F McNitt-Gray
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural    
Journal Detail:
Title:  Radiology     Volume:  249     ISSN:  1527-1315     ISO Abbreviation:  Radiology     Publication Date:  2008 Oct 
Date Detail:
Created Date:  2008-09-17     Completed Date:  2008-10-15     Revised Date:  2013-06-05    
Medline Journal Info:
Nlm Unique ID:  0401260     Medline TA:  Radiology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  220-7     Citation Subset:  AIM; IM    
Copyright Information:
(c) RSNA, 2008.
Department of Radiology, David A. Geffen School of Medicine, University of California at Los Angeles, 924 Westwood Blvd, Suite 650, Los Angeles, CA 90024, USA.
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MeSH Terms
Fetus / radiation effects*
Gestational Age
Monte Carlo Method
Pelvis / radiography*
Radiation Dosage*
Radiography, Abdominal*
Retrospective Studies
Tomography, X-Ray Computed*
Grant Support
Erratum In:
Radiology. 2010 May;255(2):664
Note: Dosage error in article text

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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