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Estimating Effective Dose of Radiation From Pediatric Cardiac CT Angiography Using a 64-MDCT Scanner: New Conversion Factors Relating Dose-Length Product to Effective Dose.
AJR Am J Roentgenol. 2017 Mar; 208(3):585-594.AA

Abstract

OBJECTIVE

The purpose of this study is to determine the conversion factors that enable accurate estimation of the effective dose (ED) used for cardiac 64-MDCT angiography performed for children.

MATERIALS AND METHODS

Anthropomorphic phantoms representative of 1- and 10-year-old children, with 50 metal oxide semiconductor field-effect transistor dosimeters placed in organs, underwent scanning performed using a 64-MDCT scanner with different routine clinical cardiac scan modes and x-ray tube potentials. Organ doses were used to calculate the ED on the basis of weighting factors published in 1991 in International Commission on Radiological Protection (ICRP) publication 60 and in 2007 in ICRP publication 103. The EDs and the scanner-reported dose-length products were used to determine conversion factors for each scan mode. The effect of infant heart rate on the ED and the conversion factors was also assessed.

RESULTS

The mean conversion factors calculated using the current definition of ED that appeared in ICRP publication 103 were as follows: 0.099 mSv · mGy-1 · cm-1, for the 1-year-old phantom, and 0.049 mSv · mGy-1 · cm-1, for the 10-year-old phantom. These conversion factors were a mean of 37% higher than the corresponding conversion factors calculated using the older definition of ED that appeared in ICRP publication 60. Varying the heart rate did not influence the ED or the conversion factors.

CONCLUSION

Conversion factors determined using the definition of ED in ICRP publication 103 and cardiac, rather than chest, scan coverage suggest that the radiation doses that children receive from cardiac CT performed using a contemporary 64-MDCT scanner are higher than the radiation doses previously reported when older chest conversion factors were used. Additional up-to-date pediatric cardiac CT conversion factors are required for use with other contemporary CT scanners and patients of different age ranges.

Authors+Show Affiliations

1 Department of Medicine, Cardiology Division, Columbia University Medical Center, New York, NY.2 Department of Pediatrics, Pediatric Cardiology Division, New York-Presbyterian Morgan Stanley Children's Hospital, Columbia University Medical Center, New York, NY.3 Philips Healthcare Research, Eindhoven, The Netherlands.4 Department of Radiology, Columbia University Medical Center, New York, NY.5 Radiological Research Accelerator Facility, Center for Radiological Research, Columbia University, Irvington, NY.4 Department of Radiology, Columbia University Medical Center, New York, NY.6 Radiation Safety Office, Columbia University Medical Center, New York, NY.7 Department of Medicine, Cardiology Division and Department of Radiology, Columbia University Medical Center and New York-Presbyterian Hospital, 622 W 168th St, PH 10-203A, New York, NY 10032.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28095022

Citation

Trattner, Sigal, et al. "Estimating Effective Dose of Radiation From Pediatric Cardiac CT Angiography Using a 64-MDCT Scanner: New Conversion Factors Relating Dose-Length Product to Effective Dose." AJR. American Journal of Roentgenology, vol. 208, no. 3, 2017, pp. 585-594.
Trattner S, Chelliah A, Prinsen P, et al. Estimating Effective Dose of Radiation From Pediatric Cardiac CT Angiography Using a 64-MDCT Scanner: New Conversion Factors Relating Dose-Length Product to Effective Dose. AJR Am J Roentgenol. 2017;208(3):585-594.
Trattner, S., Chelliah, A., Prinsen, P., Ruzal-Shapiro, C. B., Xu, Y., Jambawalikar, S., Amurao, M., & Einstein, A. J. (2017). Estimating Effective Dose of Radiation From Pediatric Cardiac CT Angiography Using a 64-MDCT Scanner: New Conversion Factors Relating Dose-Length Product to Effective Dose. AJR. American Journal of Roentgenology, 208(3), 585-594. https://doi.org/10.2214/AJR.15.15908
Trattner S, et al. Estimating Effective Dose of Radiation From Pediatric Cardiac CT Angiography Using a 64-MDCT Scanner: New Conversion Factors Relating Dose-Length Product to Effective Dose. AJR Am J Roentgenol. 2017;208(3):585-594. PubMed PMID: 28095022.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Estimating Effective Dose of Radiation From Pediatric Cardiac CT Angiography Using a 64-MDCT Scanner: New Conversion Factors Relating Dose-Length Product to Effective Dose. AU - Trattner,Sigal, AU - Chelliah,Anjali, AU - Prinsen,Peter, AU - Ruzal-Shapiro,Carrie B, AU - Xu,Yanping, AU - Jambawalikar,Sachin, AU - Amurao,Maxwell, AU - Einstein,Andrew J, Y1 - 2017/01/17/ PY - 2017/1/18/pubmed PY - 2017/4/4/medline PY - 2017/1/18/entrez KW - conversion factor KW - dose-length product KW - effective dose KW - pediatric cardiac CT KW - radiation SP - 585 EP - 594 JF - AJR. American journal of roentgenology JO - AJR Am J Roentgenol VL - 208 IS - 3 N2 - OBJECTIVE: The purpose of this study is to determine the conversion factors that enable accurate estimation of the effective dose (ED) used for cardiac 64-MDCT angiography performed for children. MATERIALS AND METHODS: Anthropomorphic phantoms representative of 1- and 10-year-old children, with 50 metal oxide semiconductor field-effect transistor dosimeters placed in organs, underwent scanning performed using a 64-MDCT scanner with different routine clinical cardiac scan modes and x-ray tube potentials. Organ doses were used to calculate the ED on the basis of weighting factors published in 1991 in International Commission on Radiological Protection (ICRP) publication 60 and in 2007 in ICRP publication 103. The EDs and the scanner-reported dose-length products were used to determine conversion factors for each scan mode. The effect of infant heart rate on the ED and the conversion factors was also assessed. RESULTS: The mean conversion factors calculated using the current definition of ED that appeared in ICRP publication 103 were as follows: 0.099 mSv · mGy-1 · cm-1, for the 1-year-old phantom, and 0.049 mSv · mGy-1 · cm-1, for the 10-year-old phantom. These conversion factors were a mean of 37% higher than the corresponding conversion factors calculated using the older definition of ED that appeared in ICRP publication 60. Varying the heart rate did not influence the ED or the conversion factors. CONCLUSION: Conversion factors determined using the definition of ED in ICRP publication 103 and cardiac, rather than chest, scan coverage suggest that the radiation doses that children receive from cardiac CT performed using a contemporary 64-MDCT scanner are higher than the radiation doses previously reported when older chest conversion factors were used. Additional up-to-date pediatric cardiac CT conversion factors are required for use with other contemporary CT scanners and patients of different age ranges. SN - 1546-3141 UR - https://www.unboundmedicine.com/medline/citation/28095022/Estimating_Effective_Dose_of_Radiation_From_Pediatric_Cardiac_CT_Angiography_Using_a_64_MDCT_Scanner:_New_Conversion_Factors_Relating_Dose_Length_Product_to_Effective_Dose_ L2 - https://www.ajronline.org/doi/10.2214/AJR.15.15908 DB - PRIME DP - Unbound Medicine ER -