Dose Estimations for Iranian 11-year-old Pediatric Phantoms Undergoing Computed Tomography Examinations

Overview

Journal J Radiat Res

Publisher Oxford University Press

Specialties Environmental Health
Oncology
Radiology

Date 2015 May 15

PMID 25972393

Citations 3

Authors

Parisa Akhlaghi

Hashem Miri-Hakimabad

Laleh Rafat-Motavalli

Affiliations

Soon will be listed here.

Abstract

In order to establish an organ and effective dose database for Iranian children undergoing computed tomography (CT) examinations, in the first step, two Iranian 11-year-old phantoms were constructed from image series obtained from CT and magnetic resonance imaging (MRI). Organ and effective doses for these phantoms were calculated for head, chest, abdomen-pelvis and chest-abdomen-pelvis (CAP) scans at tube voltages of 80, 100 and 120 kVp, and then they were compared with those of the University of Florida (UF) 11-year-old male phantom. Depth distributions of the organs and the mass of the surrounding tissues located in the beam path, which shield the internal organs, were determined for all phantoms. From the results, it was determined that the main organs of the UF phantom receive smaller doses than the two Iranian phantoms, except for the urinary bladder of the Iranian girl phantom. In addition, the relationship between the anatomical differences and the size of the dose delivered was also investigated and the discrepancies between the results were examined and justified.

Citing Articles

Radiation doses with various body weights of phantoms in brain 128-slice MDCT examination.

Lin H, Lai T, Tseng H, Wang C, Tseng Y, Chen C J Radiat Res. 2019; 60(4):466-475.

PMID: 31197311 PMC: 6640898. DOI: 10.1093/jrr/rrz029.

A Monte Carlo study on quantifying the amount of dose reduction by shielding the superficial organs of an Iranian 11-year-old boy.

Akhlaghi P, Hoseinian-Azghadi E, Miri-Hakimabad H, Rafat-Motavalli L J Med Phys. 2017; 41(4):246-253.

PMID: 28144117 PMC: 5228048. DOI: 10.4103/0971-6203.195189.

Evaluation of dose conversion coefficients for an eight-year-old Iranian male phantom undergoing computed tomography.

Akhlaghi P, Miri Hakimabad H, Rafat Motavalli L Radiat Environ Biophys. 2015; 54(4):465-74.

PMID: 26082027 DOI: 10.1007/s00411-015-0607-4.

References

Petoussi-Henss N, Bolch W, Eckerman K, Endo A, Hertel N, Hunt J . ICRP Publication 116. Conversion coefficients for radiological protection quantities for external radiation exposures. Ann ICRP. 2012; 40(2-5):1-257. DOI: 10.1016/j.icrp.2011.10.001. View

Lee C, Williams J, Lee C, Bolch W . The UF series of tomographic computational phantoms of pediatric patients. Med Phys. 2006; 32(12):3537-48. DOI: 10.1118/1.2107067. View

Lee C, Kim K, Long D, Bolch W . Organ doses for reference pediatric and adolescent patients undergoing computed tomography estimated by Monte Carlo simulation. Med Phys. 2012; 39(4):2129-46. PMC: 3326072. DOI: 10.1118/1.3693052. View

Gallagher D, Visser M, Sepulveda D, Pierson R, Harris T, Heymsfield S . How useful is body mass index for comparison of body fatness across age, sex, and ethnic groups?. Am J Epidemiol. 1996; 143(3):228-39. DOI: 10.1093/oxfordjournals.aje.a008733. View

Brenner D, Hall E . Computed tomography--an increasing source of radiation exposure. N Engl J Med. 2007; 357(22):2277-84. DOI: 10.1056/NEJMra072149. View

Zankl M, Veit R, Williams G, Schneider K, FENDEL H, Petoussi N . The construction of computer tomographic phantoms and their application in radiology and radiation protection. Radiat Environ Biophys. 1988; 27(2):153-64. DOI: 10.1007/BF01214605. View

Hoseinian-Azghadi E, Rafat-Motavalli L, Miri-Hakimabad H . Development of a 9-months pregnant hybrid phantom and its internal dosimetry for thyroid agents. J Radiat Res. 2014; 55(4):730-47. PMC: 4099984. DOI: 10.1093/jrr/rrt223. View

Caon M, Bibbo G, Pattison J . An EGS4-ready tomographic computational model of a 14-year-old female torso for calculating organ doses from CT examinations. Phys Med Biol. 1999; 44(9):2213-25. DOI: 10.1088/0031-9155/44/9/309. View

Lee C, Kim K, Long D, Fisher R, Tien C, Simon S . Organ doses for reference adult male and female undergoing computed tomography estimated by Monte Carlo simulations. Med Phys. 2011; 38(3):1196-206. PMC: 3055697. DOI: 10.1118/1.3544658. View

10.

Christ A, Kainz W, Hahn E, Honegger K, Zefferer M, Neufeld E . The Virtual Family--development of surface-based anatomical models of two adults and two children for dosimetric simulations. Phys Med Biol. 2009; 55(2):N23-38. DOI: 10.1088/0031-9155/55/2/N01. View

11.

Khursheed A, Hillier M, Shrimpton P, Wall B . Influence of patient age on normalized effective doses calculated for CT examinations. Br J Radiol. 2002; 75(898):819-30. DOI: 10.1259/bjr.75.898.750819. View

12.

Berrington de Gonzalez A, Mahesh M, Kim K, Bhargavan M, Lewis R, Mettler F . Projected cancer risks from computed tomographic scans performed in the United States in 2007. Arch Intern Med. 2009; 169(22):2071-7. PMC: 6276814. DOI: 10.1001/archinternmed.2009.440. View

13.

Kalender W . Dose in x-ray computed tomography. Phys Med Biol. 2014; 59(3):R129-50. DOI: 10.1088/0031-9155/59/3/R129. View

14.

Akhlaghi P, Miri-Hakimabad H, Rafat-Motavalli L . Effects of shielding the radiosensitive superficial organs of ORNL pediatric phantoms on dose reduction in computed tomography. J Med Phys. 2014; 39(4):238-46. PMC: 4258732. DOI: 10.4103/0971-6203.144490. View

15.

Han E, Bolch W, Eckerman K . Revisions to the ORNL series of adult and pediatric computational phantoms for use with the MIRD schema. Health Phys. 2006; 90(4):337-56. DOI: 10.1097/01.HP.0000192318.13190.c4. View

16.

Nagaoka T, Kunieda E, Watanabe S . Proportion-corrected scaled voxel models for Japanese children and their application to the numerical dosimetry of specific absorption rate for frequencies from 30 MHz to 3 GHz. Phys Med Biol. 2008; 53(23):6695-711. DOI: 10.1088/0031-9155/53/23/004. View