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Pulmonary embolism in pregnant patients: fetal radiation dose with helical CT.
Radiology. 2002 Aug; 224(2):487-92.R

Abstract

PURPOSE

To calculate mean fetal radiation dose from helical chest computed tomography (CT) by using maternal-fetal geometries obtained from healthy pregnant women and to compare the calculated CT doses with the fetal doses reported with scintigraphy.

MATERIALS AND METHODS

Maternal-fetal geometries were determined in 23 pregnant women with varying body mass index and fetal gestational age. Monte Carlo techniques were used to estimate the dose that would be received by each fetus from CT scanning performed with the following parameters: 120 kVp; 100 mA; scanning time, 1 second per section; collimation, 2.5 mm; pitch of 1. Craniocaudal extent of the scan was 11 cm, with the most caudal section edge being 5 mm inferior to the xiphoid process.

RESULTS

For helical CT, estimated mean fetal doses in micrograys at varying gestational ages were as follows: 3.3-20.2 microGy, first trimester; 7.9-76.7 microGy, second trimester; and 51.3-130.8 microGy, third trimester. These values were all less than mean fetal doses reported with scintigraphy, with 37-74 MBq of macroaggregates of human serum albumin labeled with technetium 99m. If 200 mAs (pitch of 1.8) was used, the mean fetal doses were still less than those with scintigraphy.

CONCLUSION

The average fetal radiation dose with helical CT is less than that with ventilation-perfusion lung scanning during all trimesters.

Authors+Show Affiliations

Department of Radiology, Indiana University School of Medicine, 550 N University Blvd, Indianapolis, IN 46202, USA. hwinermu@iupui.eduNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

12147847

Citation

Winer-Muram, Helen T., et al. "Pulmonary Embolism in Pregnant Patients: Fetal Radiation Dose With Helical CT." Radiology, vol. 224, no. 2, 2002, pp. 487-92.
Winer-Muram HT, Boone JM, Brown HL, et al. Pulmonary embolism in pregnant patients: fetal radiation dose with helical CT. Radiology. 2002;224(2):487-92.
Winer-Muram, H. T., Boone, J. M., Brown, H. L., Jennings, S. G., Mabie, W. C., & Lombardo, G. T. (2002). Pulmonary embolism in pregnant patients: fetal radiation dose with helical CT. Radiology, 224(2), 487-92.
Winer-Muram HT, et al. Pulmonary Embolism in Pregnant Patients: Fetal Radiation Dose With Helical CT. Radiology. 2002;224(2):487-92. PubMed PMID: 12147847.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Pulmonary embolism in pregnant patients: fetal radiation dose with helical CT. AU - Winer-Muram,Helen T, AU - Boone,John M, AU - Brown,Haywood L, AU - Jennings,S Gregory, AU - Mabie,William C, AU - Lombardo,Gerard T, PY - 2002/7/31/pubmed PY - 2002/9/6/medline PY - 2002/7/31/entrez SP - 487 EP - 92 JF - Radiology JO - Radiology VL - 224 IS - 2 N2 - PURPOSE: To calculate mean fetal radiation dose from helical chest computed tomography (CT) by using maternal-fetal geometries obtained from healthy pregnant women and to compare the calculated CT doses with the fetal doses reported with scintigraphy. MATERIALS AND METHODS: Maternal-fetal geometries were determined in 23 pregnant women with varying body mass index and fetal gestational age. Monte Carlo techniques were used to estimate the dose that would be received by each fetus from CT scanning performed with the following parameters: 120 kVp; 100 mA; scanning time, 1 second per section; collimation, 2.5 mm; pitch of 1. Craniocaudal extent of the scan was 11 cm, with the most caudal section edge being 5 mm inferior to the xiphoid process. RESULTS: For helical CT, estimated mean fetal doses in micrograys at varying gestational ages were as follows: 3.3-20.2 microGy, first trimester; 7.9-76.7 microGy, second trimester; and 51.3-130.8 microGy, third trimester. These values were all less than mean fetal doses reported with scintigraphy, with 37-74 MBq of macroaggregates of human serum albumin labeled with technetium 99m. If 200 mAs (pitch of 1.8) was used, the mean fetal doses were still less than those with scintigraphy. CONCLUSION: The average fetal radiation dose with helical CT is less than that with ventilation-perfusion lung scanning during all trimesters. SN - 0033-8419 UR - https://www.unboundmedicine.com/medline/citation/12147847/Pulmonary_embolism_in_pregnant_patients:_fetal_radiation_dose_with_helical_CT_ L2 - http://pubs.rsna.org/doi/10.1148/radiol.2242011581?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -