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Fetal radiation dose in computed tomography.
Radiat Prot Dosimetry. 2015 Jul; 165(1-4):226-30.RP

Abstract

The connection between recorded volumetric CT dose index (CTDI vol) and determined mean fetal dose (Df) was examined from metal-oxide-semiconductor field-effect transistor dose measurements on an anthropomorphic female phantom in four stages of pregnancy in a 64-slice CT scanner. Automated tube current modulation kept the mean Df fairly constant through all pregnancy stages in trauma (4.4-4.9 mGy) and abdomino-pelvic (2.1-2.4 mGy) protocols. In pulmonary angiography protocol, the mean Df increased exponentially as the distance from the end of the scan range decreased (0.01-0.09 mGy). For trauma protocol, the relative mean Df as a function of gestational age were in the range 0.80-0.97 compared with the mean CTDI vol. For abdomino-pelvic protocol, the relative mean Df was 0.57-0.79 and for pulmonary angiography protocol, 0.01-0.05 compared with the mean CTDI vol, respectively. In conclusion, if the fetus is in the primary beam, the CTDI vol can be used as an upper estimate of the fetal dose. If the fetus is not in the primary beam, the fetal dose can be estimated by considering also the distance of the fetus from the scan range.

Authors+Show Affiliations

HUS Medical Imaging Center, University of Helsinki and Helsinki University Hospital, PO Box 340, FI-00290 Helsinki, Finland Department of Physics, University of Helsinki, PO Box 64, FI-00014 Helsinki, Finland anna.kelaranta@alumni.helsinki.fi.HUS Medical Imaging Center, University of Helsinki and Helsinki University Hospital, PO Box 340, FI-00290 Helsinki, Finland Department of Physics, University of Helsinki, PO Box 64, FI-00014 Helsinki, Finland.HUS Medical Imaging Center, University of Helsinki and Helsinki University Hospital, PO Box 340, FI-00290 Helsinki, Finland.STUK - Radiation and Nuclear Safety Authority, Laippatie 4, PO Box 14, FI-00881 Helsinki, Finland.HUS Medical Imaging Center, University of Helsinki and Helsinki University Hospital, PO Box 340, FI-00290 Helsinki, Finland Department of Physics, University of Helsinki, PO Box 64, FI-00014 Helsinki, Finland.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

25836690

Citation

Kelaranta, Anna, et al. "Fetal Radiation Dose in Computed Tomography." Radiation Protection Dosimetry, vol. 165, no. 1-4, 2015, pp. 226-30.
Kelaranta A, Kaasalainen T, Seuri R, et al. Fetal radiation dose in computed tomography. Radiat Prot Dosimetry. 2015;165(1-4):226-30.
Kelaranta, A., Kaasalainen, T., Seuri, R., Toroi, P., & Kortesniemi, M. (2015). Fetal radiation dose in computed tomography. Radiation Protection Dosimetry, 165(1-4), 226-30. https://doi.org/10.1093/rpd/ncv097
Kelaranta A, et al. Fetal Radiation Dose in Computed Tomography. Radiat Prot Dosimetry. 2015;165(1-4):226-30. PubMed PMID: 25836690.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Fetal radiation dose in computed tomography. AU - Kelaranta,Anna, AU - Kaasalainen,Touko, AU - Seuri,Raija, AU - Toroi,Paula, AU - Kortesniemi,Mika, Y1 - 2015/04/01/ PY - 2015/4/4/entrez PY - 2015/4/4/pubmed PY - 2016/4/23/medline SP - 226 EP - 30 JF - Radiation protection dosimetry JO - Radiat Prot Dosimetry VL - 165 IS - 1-4 N2 - The connection between recorded volumetric CT dose index (CTDI vol) and determined mean fetal dose (Df) was examined from metal-oxide-semiconductor field-effect transistor dose measurements on an anthropomorphic female phantom in four stages of pregnancy in a 64-slice CT scanner. Automated tube current modulation kept the mean Df fairly constant through all pregnancy stages in trauma (4.4-4.9 mGy) and abdomino-pelvic (2.1-2.4 mGy) protocols. In pulmonary angiography protocol, the mean Df increased exponentially as the distance from the end of the scan range decreased (0.01-0.09 mGy). For trauma protocol, the relative mean Df as a function of gestational age were in the range 0.80-0.97 compared with the mean CTDI vol. For abdomino-pelvic protocol, the relative mean Df was 0.57-0.79 and for pulmonary angiography protocol, 0.01-0.05 compared with the mean CTDI vol, respectively. In conclusion, if the fetus is in the primary beam, the CTDI vol can be used as an upper estimate of the fetal dose. If the fetus is not in the primary beam, the fetal dose can be estimated by considering also the distance of the fetus from the scan range. SN - 1742-3406 UR - https://www.unboundmedicine.com/medline/citation/25836690/Fetal_radiation_dose_in_computed_tomography_ L2 - https://academic.oup.com/rpd/article-lookup/doi/10.1093/rpd/ncv097 DB - PRIME DP - Unbound Medicine ER -