Effective dose estimation for pediatric voiding cystourethrography using an anthropomorphic phantom set and metal oxide semiconductor field-effect transistor (MOSFET) technology
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The risks associated with radiation exposure are higher in children than in adults. Therefore the use of fluoroscopy in common pediatric examinations such as voiding cystourethrography (VCUG) requires accurate determination of the associated effective dose.
To estimate effective dose for VCUG examinations performed in children younger than 10 years using anthropomorphic phantoms and metal oxide semiconductor field-effect transistor (MOSFET) dosimeters.
Materials and methods
MOSFETs were placed within four phantoms representing children ≤10 years old, at locations corresponding to radiosensitive organs, and exposed to a mock VCUG (5 min of fluoroscopy, 50 spot exposures) to minimize measurement error. Effective dose was measured and scaled to a standardized clinical VCUG (1 min fluoroscopy, 5 spot exposures) determined from patient logs. Monte Carlo simulations were performed to assess the accuracy of the measured effective dose. The dose area product (DAP) from each VCUG was compared to the effective dose.
Effective doses ranged from 0.10 to 0.55 mSv, increased with age, and were higher in girls. Fluoroscopy accounted for 88–90% of the total effective dose, and spot exposures 10–12%. MOSFET-measured and simulation-derived effective doses were comparable (T > 0.12). DAP was strongly correlated with effective dose for both genders (r2>0.97, P < 0.0001).
Effective doses for VCUG examinations performed in children ≤10 years of age are low but not negligible.
KeywordsVoiding cystourethrogram Effective dose Anthropomorphic phantoms MOSFET Children
- 2.ICRP (1991) 1990 Recommendations of the International Commission on Radiological Protection. Publication 60. Annals of the ICRP 21(1-3). Pergamon, OxfordGoogle Scholar
- 12.Hurwitz LM, Yoshizumi T, Goodman P et al (2007) Effective dose determination using an anthropomorphic phantom and metal oxide semiconductor field effect transistor technology for clinical adult body multidetector computed tomography protocols. J Comput Assist Tomogr 31:544–549PubMedCrossRefGoogle Scholar
- 14.National Research Council (2006) Health risks of exposure to low levels of ionizing radiation: BEIR VII. National Academies Press, Washington DCGoogle Scholar
- 18.Christy M, Eckerman KF (1987) Specific absorbed dose fractions of energy at various ages from internal photon sources. Appendix A: description of the mathematical phantoms. ORNL/TM-8381/VI. Oak Ridge National Laboratory, Oak Ridge, TNGoogle Scholar
- 19.Varchena V, Gubatova DJ, Sidorin V (1993) Children’s heterogeneous phantoms and their application in roentgenology. Radiat Prot Dosim 49:77–78Google Scholar
- 21.Servomaa A, Tapiovaara M (1998) Organ dose calculation in medical x ray examinations by the program PCXMC. Radiat Prot Dosim 80:213–219Google Scholar
- 22.Hart D, Hillier MC, Walls BF (2002) Doses to patients from medical x-ray examinations in the UK – 2000 review. NRPB-W14. National Radiation Protection Board, Chilton, UKGoogle Scholar
- 23.Hart D, Hillier MC, Jones DG (2007) Doses to patients from radiographic and fluoroscopic x-ray imaging procedures in the UK – 2005 review. HPA-RPD-029. Health Protection Agency, Chilton, UKGoogle Scholar
- 25.Hart D, Jones DG, Wall BF (1996) Estimation of effective doses from pediatric x-ray examinations. NRPB-R279. National Radiological Protection Board, Chilton, UKGoogle Scholar