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Medical Physics |
1 From the Department of Radiology, Indiana University School of Medicine, 550 N University Blvd, Indianapolis, IN 46202 (H.T.W.M., S.G.J.); Department of Radiology, University of California-Davis Medical Center, Sacramento (J.M.B.); Department of Obstetrics and Gynecology, St Vincent’s Medical Center, Indianapolis, Ind (H.L.B.); Department of Obstetrics and Gynecology, University of Tennessee College of Medicine, Memphis (W.C.M.); and Division of Pulmonary Medicine and Critical Care, New York Methodist Hospital, Brooklyn, NY (G.T.L.). Received September 24, 2001; revision requested November 27; revision received December 17; accepted January 22, 2002. Address correspondence to H.T.W.M. (e-mail: hwinermu@iupui.edu).
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 µGy, first trimester; 7.9–76.7 µGy, second trimester; and 51.3–130.8 µGy, 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.
© RSNA, 2002
Index terms: Embolism, pulmonary, 60.72 • Pregnancy, 85.131, 85.47 • Radiations, exposure to patients and personnel • Thorax, CT, 60.1211, 60.12115
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