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Radiation dose estimation for prospective and retrospective ECG-gated cardiac CT angiography in infants and small children using a 320-MDCT volume scanner.
AJR Am J Roentgenol. 2012 Nov; 199(5):1129-35.AA

Abstract

OBJECTIVE

The purpose of this study is to determine patient dose estimates for clinical pediatric cardiac-gated CT angiography (CTA) protocols on a 320-MDCT volume scanner.

MATERIALS AND METHODS

Organ doses were measured using 20 metal oxide semiconductor field effect transistor (MOSFET) dosimeters. Radiation dose was estimated for volumetrically acquired clinical pediatric prospectively and retrospectively ECG-gated cardiac CTA protocols in 5-year-old and 1-year-old anthropomorphic phantoms on a 320-MDCT scanner. Simulated heart rates of 60 beats/min (5-year-old phantom) and 120 beats/min (1- and 5-year-old phantoms) were used. Effective doses (EDs) were calculated using average measured organ doses and International Commission on Radiological Protection 103 tissue-weighting factors. Dose-length product (DLP) was recorded for each examination and was used to develop dose conversion factors for pediatric cardiac examinations acquired with volume scan mode. DLP was also used to estimate ED according to recently published dose conversion factors for pediatric helical chest examinations. Repeated measures and paired Student t test analyses were performed.

RESULTS

For the 5-year-old phantom, at 60 beats/min, EDs ranged from 1.2 mSv for a prospectively gated examination to 4.5 mSv for a retrospectively gated examination. For the 5-year-old phantom, at 120 beats/min, EDs ranged from 3.0 mSv for a prospectively gated examination to 4.9 mSv for a retrospectively gated examination. For the 1-year-old phantom, at 120 beats/min, EDs ranged from 2.7 mSv for a prospectively gated examination to 4.5 mSv for a retrospectively gated examination.

CONCLUSION

EDs for 320-MDCT volumetrically acquired ECG-gated pediatric cardiac CTA are lower than those published for conventional 16- and 64-MDCT scanners.

Authors+Show Affiliations

Department of Radiology, Cincinnati Children's Hospital Medical Center, 3333 Burnet Ave, MLC 5031, Cincinnati, OH 45229, USA. daniel.podberesky@cchmc.orgNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

23096189

Citation

Podberesky, Daniel J., et al. "Radiation Dose Estimation for Prospective and Retrospective ECG-gated Cardiac CT Angiography in Infants and Small Children Using a 320-MDCT Volume Scanner." AJR. American Journal of Roentgenology, vol. 199, no. 5, 2012, pp. 1129-35.
Podberesky DJ, Angel E, Yoshizumi TT, et al. Radiation dose estimation for prospective and retrospective ECG-gated cardiac CT angiography in infants and small children using a 320-MDCT volume scanner. AJR Am J Roentgenol. 2012;199(5):1129-35.
Podberesky, D. J., Angel, E., Yoshizumi, T. T., Toncheva, G., Salisbury, S. R., Alsip, C., Barelli, A., Egelhoff, J. C., Anderson-Evans, C., Nguyen, G. B., Dow, D., & Frush, D. P. (2012). Radiation dose estimation for prospective and retrospective ECG-gated cardiac CT angiography in infants and small children using a 320-MDCT volume scanner. AJR. American Journal of Roentgenology, 199(5), 1129-35. https://doi.org/10.2214/AJR.12.8480
Podberesky DJ, et al. Radiation Dose Estimation for Prospective and Retrospective ECG-gated Cardiac CT Angiography in Infants and Small Children Using a 320-MDCT Volume Scanner. AJR Am J Roentgenol. 2012;199(5):1129-35. PubMed PMID: 23096189.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Radiation dose estimation for prospective and retrospective ECG-gated cardiac CT angiography in infants and small children using a 320-MDCT volume scanner. AU - Podberesky,Daniel J, AU - Angel,Erin, AU - Yoshizumi,Terry T, AU - Toncheva,Greta, AU - Salisbury,Shelia R, AU - Alsip,Christopher, AU - Barelli,Alessandra, AU - Egelhoff,John C, AU - Anderson-Evans,Colin, AU - Nguyen,Giao B, AU - Dow,David, AU - Frush,Donald P, PY - 2012/10/26/entrez PY - 2012/10/26/pubmed PY - 2013/1/5/medline SP - 1129 EP - 35 JF - AJR. American journal of roentgenology JO - AJR Am J Roentgenol VL - 199 IS - 5 N2 - OBJECTIVE: The purpose of this study is to determine patient dose estimates for clinical pediatric cardiac-gated CT angiography (CTA) protocols on a 320-MDCT volume scanner. MATERIALS AND METHODS: Organ doses were measured using 20 metal oxide semiconductor field effect transistor (MOSFET) dosimeters. Radiation dose was estimated for volumetrically acquired clinical pediatric prospectively and retrospectively ECG-gated cardiac CTA protocols in 5-year-old and 1-year-old anthropomorphic phantoms on a 320-MDCT scanner. Simulated heart rates of 60 beats/min (5-year-old phantom) and 120 beats/min (1- and 5-year-old phantoms) were used. Effective doses (EDs) were calculated using average measured organ doses and International Commission on Radiological Protection 103 tissue-weighting factors. Dose-length product (DLP) was recorded for each examination and was used to develop dose conversion factors for pediatric cardiac examinations acquired with volume scan mode. DLP was also used to estimate ED according to recently published dose conversion factors for pediatric helical chest examinations. Repeated measures and paired Student t test analyses were performed. RESULTS: For the 5-year-old phantom, at 60 beats/min, EDs ranged from 1.2 mSv for a prospectively gated examination to 4.5 mSv for a retrospectively gated examination. For the 5-year-old phantom, at 120 beats/min, EDs ranged from 3.0 mSv for a prospectively gated examination to 4.9 mSv for a retrospectively gated examination. For the 1-year-old phantom, at 120 beats/min, EDs ranged from 2.7 mSv for a prospectively gated examination to 4.5 mSv for a retrospectively gated examination. CONCLUSION: EDs for 320-MDCT volumetrically acquired ECG-gated pediatric cardiac CTA are lower than those published for conventional 16- and 64-MDCT scanners. SN - 1546-3141 UR - https://www.unboundmedicine.com/medline/citation/23096189/Radiation_dose_estimation_for_prospective_and_retrospective_ECG_gated_cardiac_CT_angiography_in_infants_and_small_children_using_a_320_MDCT_volume_scanner_ L2 - https://www.ajronline.org/doi/10.2214/AJR.12.8480 DB - PRIME DP - Unbound Medicine ER -