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Fetal radiation dose during gestation estimated on an anthropomorphic phantom for three generations of CT scanners.
AJR Am J Roentgenol 2011; 196(5):1133-7AA

Abstract

OBJECTIVE

The purpose of this study is to determine fetal dose during four different stages of pregnancy for both pulmonary CT angiogram and abdominal and pelvic CT examination on 4-, 16-, and 64-MDCT scanners measured in an anthropomorphic phantom simulating a pregnant patient.

MATERIALS AND METHODS

Pulmonary angiograms and abdominal and pelvic studies were performed on a phantom on 4-, 16-, and 64-MDCT scanners. Fetal positioning and mean fetal depth were determined using data from ultrasound examinations of a large cohort of patients. Scans were performed for early pregnancy and for 10, 18, and 36 weeks. Gestational age, fetal dose, and entrance skin exposure were measured.

RESULTS

When constant parameters were used for pulmonary CT angiograms, the fetal radiation dose was not significantly associated with gestational age. For abdominal examinations, the 64-MDCT scanner imparted a 20% higher dose during the third trimester than did the other scanners. When scanning parameters were kept constant between machines, gestational age and fetal dose were not significantly different. However, when the manufacturer-recommended protocols for pregnant patients were used, the dose was significantly higher in the third trimester on the 64-MDCT scanner.

CONCLUSION

The 64-MDCT scanner is the most dose-efficient machine when the fetus is outside the direct scan volume, as in the case of pulmonary angiograms. For abdominal examinations, the 64-MDCT scanner imparted the highest fetal dose. This finding is attributable to the increased tube current used to penetrate the larger amount of soft tissue in late pregnancy. Abdominal shielding may reduce fetal dose without affecting diagnostic ability.

Authors+Show Affiliations

Department of Radiology, Stony Brook University Medical Center, NY 11794-8460, USA. anthonygilet@gmail.comNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

21512081

Citation

Gilet, Anthony G., et al. "Fetal Radiation Dose During Gestation Estimated On an Anthropomorphic Phantom for Three Generations of CT Scanners." AJR. American Journal of Roentgenology, vol. 196, no. 5, 2011, pp. 1133-7.
Gilet AG, Dunkin JM, Fernandez TJ, et al. Fetal radiation dose during gestation estimated on an anthropomorphic phantom for three generations of CT scanners. AJR Am J Roentgenol. 2011;196(5):1133-7.
Gilet, A. G., Dunkin, J. M., Fernandez, T. J., Button, T. M., & Budorick, N. E. (2011). Fetal radiation dose during gestation estimated on an anthropomorphic phantom for three generations of CT scanners. AJR. American Journal of Roentgenology, 196(5), pp. 1133-7. doi:10.2214/AJR.10.4497.
Gilet AG, et al. Fetal Radiation Dose During Gestation Estimated On an Anthropomorphic Phantom for Three Generations of CT Scanners. AJR Am J Roentgenol. 2011;196(5):1133-7. PubMed PMID: 21512081.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Fetal radiation dose during gestation estimated on an anthropomorphic phantom for three generations of CT scanners. AU - Gilet,Anthony G, AU - Dunkin,Jared M, AU - Fernandez,Thomas J, AU - Button,Terry M, AU - Budorick,Nancy E, PY - 2011/4/23/entrez PY - 2011/4/23/pubmed PY - 2011/6/29/medline SP - 1133 EP - 7 JF - AJR. American journal of roentgenology JO - AJR Am J Roentgenol VL - 196 IS - 5 N2 - OBJECTIVE: The purpose of this study is to determine fetal dose during four different stages of pregnancy for both pulmonary CT angiogram and abdominal and pelvic CT examination on 4-, 16-, and 64-MDCT scanners measured in an anthropomorphic phantom simulating a pregnant patient. MATERIALS AND METHODS: Pulmonary angiograms and abdominal and pelvic studies were performed on a phantom on 4-, 16-, and 64-MDCT scanners. Fetal positioning and mean fetal depth were determined using data from ultrasound examinations of a large cohort of patients. Scans were performed for early pregnancy and for 10, 18, and 36 weeks. Gestational age, fetal dose, and entrance skin exposure were measured. RESULTS: When constant parameters were used for pulmonary CT angiograms, the fetal radiation dose was not significantly associated with gestational age. For abdominal examinations, the 64-MDCT scanner imparted a 20% higher dose during the third trimester than did the other scanners. When scanning parameters were kept constant between machines, gestational age and fetal dose were not significantly different. However, when the manufacturer-recommended protocols for pregnant patients were used, the dose was significantly higher in the third trimester on the 64-MDCT scanner. CONCLUSION: The 64-MDCT scanner is the most dose-efficient machine when the fetus is outside the direct scan volume, as in the case of pulmonary angiograms. For abdominal examinations, the 64-MDCT scanner imparted the highest fetal dose. This finding is attributable to the increased tube current used to penetrate the larger amount of soft tissue in late pregnancy. Abdominal shielding may reduce fetal dose without affecting diagnostic ability. SN - 1546-3141 UR - https://www.unboundmedicine.com/medline/citation/21512081/Fetal_radiation_dose_during_gestation_estimated_on_an_anthropomorphic_phantom_for_three_generations_of_CT_scanners_ L2 - http://www.ajronline.org/doi/full/10.2214/AJR.10.4497 DB - PRIME DP - Unbound Medicine ER -