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The comparison of size-specific dose estimate in CT examination based on head and body PMMA phantom

*Mohd Hanafi Ali  -  Department of Medical Radiation Sciences, The University of Sydney, Australia
Choirul Anam  -  Department of Physics, Faculty of Mathematics and Natural Sciences, Diponegoro University, Indonesia
Freddy Haryanto  -  Department of Physics, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, Indonesia
Geoff Dougherty  -  Applied Physics and Medical Imaging, California State University Channel Islands, United States
Received: 14 Dec 2018; Published: 14 Dec 2018.

Citation Format:
Abstract
Nowadays, a dose estimate for individual patients undergoing CT examination is carried out using the metric of size-specific dose estimate (SSDE), which is calculated by multiplying a volume CT dose index (CTDIvol) and a correction factor that is a function of patient size. Two CTDIvol values are based on head and body PMMA phantoms. There are also two values of correction factors (k), both for head and body PMMA phantoms. The purpose of this study was to compare the SSDE values calculated using head and body PMMA phantoms with their corresponding correction factors (k). The CTDIvol values were derived from the ImPACT 1.04 software for 12 CT scanners: Sensation 4, Sensation 16, Sensation 64, Light Speed, Light Speed 16, Light Speed VCT, Secura, Brilliance 16, Brilliance 64, Asteion Dual, Aquilion 4, and Aquilion 16. The size of the patients who underwent CT examination was characterized by a water-equivalent diameter (Dw) from 10 cm to 45 cm. The results indicated that the differences in SSDE values based on head and body CTDIvol were within 20%. Thus, the SSDE value can be calculated using the head or body CTDIvol bases with corresponding k value.
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Keywords: CTDIvol;SSDE; Water-equivalent diameter;Patient dose
Funding: Kementerian Riset, Teknologi, dan Pendidikan Tinggi, Republik Indonesia

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  1. T. B.Shope, R. M. Gagne, and G. C. Johnson,“A method for describing the doses delivered by transmission x-ray computed tomography,” Med. Phys. 8, 488–495 (1981)
  2. C. Anam, F. Haryanto, R. Widita, I. Arif, T. Fujibuchi, T. Toyoda, and G. Dougherty,“Scatter index measurement using a CT dose profiler,”J. Med. Phys. Biop.4, 95-102 (2017)
  3. W. A. Kalender,“Dose in x-ray computed tomography,” Phys. Med. Biol. 59, R129–R150 (2014)
  4. M. F. McNitt-Gray,“AAPM/RSNA physics tutorial for residents: topics in CT—radiation dose in CT,” Radio Graphics 22, 1541–1553 (2002)
  5. International Atomic Energy Agency,“Quality assurance programme for computed tomography: diagnostic and therapy applications,” Human Health Series No. 19. Vienna, IAEA(2012)
  6. American Association of Physicists in Medicine,“The measurement, reporting, and management of radiation dose in CT,” Report No. 96. Report of the Task Group 23 of the Diagnostic Imaging Council CT Committee. College Park, MD: AAPM(2008)
  7. J. Vassileva, M. M. Rehani, K. Applegate, N. A. Ahmed, H. Al-Dhuhli, and H. M. Al-Naemi,“IAEA survey of paediatric computed tomography practice in 40 countries in Asia, Europe, Latin America and Africa: procedures and protocols,” Eur.Radiol. 23, 623–631 (2013)
  8. C. Anam, F. Haryanto, R. Widita, and I. Arif, “Automated estimation of patient’s size from 3D image ofpatient for sizespecificdoseestimates (SSDE),” Adv. Sci. Eng. Med. 7, 892-896 (2015)
  9. C. H. McCollough, S. Leng, Y. Lifeng, D. D. Cody, J. M. Boone, and M. F. McNitt-Gray,“CT dose index and patient dose: they are not the same thing,” Radiology 259, 311–316 (2011)
  10. M. Nasir, D. Pratama, C. Anam, and F. Haryanto,“Calculation of size specific dose estimates (SSDE) value at cylindrical phantom from CBCT Varian OBI v1.4 X-ray tube EGSnrc Monte Carlo simulation based,” J.Phy.Conf. Ser. 694, 012040 (2016)
  11. X. Li, D. Zhang, and B. Liu,“Monte Carlo assessment of CT dose equilibration in PMMA and water cylinders with diameters from 6 to 55 cm,” Med. Phys. 40, 031903 (2013)
  12. E. L. Nickoloff, A. K. Dutta, and Z. F. Lu,“Influence of phantom diameter, kVp and scan mode upon computed tomography dose Index,” Med. Phys. 30, 395-402 (2003)
  13. C. Anam, F. Haryanto, R. Widita, I. Arif, G. Dougherty, andD. McLean, “Volume computed-tomography dose index (CTDI vol )and size-specific dose estimate (SSDE) for tubecurrent modulation (TCM) in CT scanning,”Int. J.Radiat. Res.16, 289- 297 (2018)
  14. T. Fearon, H. Xie, J. Y. Cheng, H. Ning, Y. Zhuge, and R. W. Miller,“Patient-specific CT dosimetry calculation: a feasibility study,” J.Appl.Clin. Med. Phys. 12, 196-209 (2011)
  15. W. Huda, E. M. Scalzetti, and M. Roskopf,“Effective doses to patients undergoing thoracic computed tomography examinations,” Med. Phys. 27, 838– 844 (2000)
  16. T. Fujibuchi, N. Funabashi, M. Hashimoto, H. Kato, M. Kurokawa, H. M. Deloar, E. Kunieda, I. Komuro, and T. Sakae,“Estimate of organ radiation absorbed dose in clinical CT using the radiation treatment planning system,”Radiat.Prot.Dosim. 142, 174–183 (2010)
  17. K. Perisinakis, A. Tzedakis, and J. Damilakis,“On the use of Monte Carlo-derived dosimetric data in the estimation of patient dose from CT examinations,” Med. Phys. 35, 2018-2028 (2008)
  18. American Association of Physicists in Medicine,“Size-specific dose estimates (SSDE) in pediatric and adult body CT examinations,” Report No. 204. Report of the Task Group 204. College Park, MD: AAPM (2011)
  19. C. Anam, F. Haryanto, R. Widita, I. Arif, and G. Dougherty, “A fully automated calculation of size-specific dose estimates (SSDE) in thoracic and head CT examinations,” J. Phy. Conf. Ser. 694, 012030 (2016)
  20. C. Anam, F. Haryanto, R. Widita, I. Arif, andG. Dougherty,“The evaluation of the effective diameter (D eff )calculation and its impact on the size-specificdose estimate (SSDE),” Atom Indonesia,43, 55-60 (2017)
  21. C. Anam, F. Haryanto, R. Widita, I. Arif, and G. Dougherty, “Dose-volume product (DVP) as descriptor for estimating total energy imparted to patient undergoing CT examination,” J. Med. Phys. Biop. 3, 45-55 (2016)
  22. K. J. Strauss and M. J. Goske, “Estimated pediatric radiation dose during CT,”Pediatr.Radiol. 41, S472–S482 (2011)
  23. J. A. Christner, N. N. Braun, M. C. Jacobsen, R. E. Carter, J. M. Kofler, andC. H. McCollough,“Size- specific dose estimates for adult patients at CT of the torso, Radiology 265, 841–847 (2012)
  24. C. Anam, F. Haryanto, R. Widita, I. Arif, G. Dougherty, and D. McLean,“Estimation of Eye Radiation Dose during Nasopharyngeal CT Examination for an Individual Patient,” Information (Japan) 19, 3951-3962 (2016)
  25. C. Anam, T. Fujibuchi, T. Toyoda, N. Sato, F. Haryanto, R. Widita, I. Arif, andG. Dougherty, “A simple method for calibrating pixel valuesof the ct localizer radiograph for calculating water-equivalent diameter and size-specific doseestimate,” Radiat.Prot.Dosim. 179, 158-168 (2018)

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