COMPARATIVE DOSIMETRIC STUDY IN CHEST COMPUTED TOMOGRAPHY USING PHANTOMS

Authors

  • Wadia Aburjaile
  • Mauricio Gomez Universidade Federal de Minas Gerais
  • Arnaldo Prata Mourão

DOI:

https://doi.org/10.15392/bjrs.v7i1A.342

Keywords:

Computed Tomography, phantoms, dosimetry.

Abstract

The dissemination of Computed Tomography (CT) scan has promoted a significant increase in the absorbed dose by patients due to the diagnosis. Therefore, it is indispensable to improve protocols, seeking smaller doses, without impairing the diagnostic quality of the image. The risks of stochastic effects are greater for children due to tissue radiosensitivity coupled with longer life expectancy. In this work, a cylindrical phantom made of polymethylmethacrylate was used representing an adult chest, and a second phantom made of the same material was designed in an oblong shape, including axillary region, based on the dimensions of an eight year old pediatric patient. A comparative study was performed between chest scans formulated in two CT scanners in different radiodiagnostic services. The central slice of the both phantoms was irradiated successively, using a pencil ionization chamber, for the measurements in five different points of each phantom. From the measurements, we obtain values of weighted and volumetric Dose Index (CK,PMMA,vol). The scans were performed with the routine chest acquisition protocols of the radiodiagnostic services, both for a voltage of 120 kV X-ray tube supply voltage. This work allowed compare the absorbed dose between patients with variable chest volumes and the dose variation in patients between two equipments used for image generation with the same diagnostic objective.

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Author Biographies

  • Wadia Aburjaile
    Departamento de Engenharia Nuclear - UFMG
  • Mauricio Gomez, Universidade Federal de Minas Gerais
    Departamento de Engenharia Nuclear - Universidade Federal de Minas Gerais
  • Arnaldo Prata Mourão
    Centro de Engenharia Biomedica - CEFET-MG

References

MOURÃO, A. P.; ALONSO, T. C. Dose profile variation with voltage in head CT scans using radio-chromic filmes. Rio de Janeiro: ISRP2012. 2012.

MOURÃO, A. P. Tomografia computadorizada. 2. ed. Rio de Janeiro: SENAC, 2015. 241 p.

BOLUS, N. E. NCRP Report 160 and What It Means for Medical Imaging and Nuclear Medicine. J Nucl Med Technol, Alabama, p. 41:255–260, 2013.

MOURÃO, A. P.; OLIVEIRA, F. A. D. Fundamentos de Radiologia e Imagem. São Caetano do Sul: Difusão, 2009.

INTERNATIONAL ATOMIC ENERGY AGENCY. International basic safety standards for protection against ionizing radiation and for safety of radiation sources. Viena: [s.n.], v. Safety Series, 115, 1996.

PRANDO, A.; MOREIRA, F. A. Fundamentos de radiologia e diagnóstico por imagem. Colé-gio Brasileiro de Radiologia. 2. ed. São Paulo, 2015.

TUBIANA, M.; DUTREIX, J.; WANBERCIE, A. Introduction to radiobiologie. London: Taylor & Francis, 1990. 261 p.

IMAGE GENTLY. The alliance for radiation safety in pediatric imaging. Disponivel em: http://www.imagegently.org/About-Us/The-Alliance. 2014.

INTERNATIONAL ATOMIC ENERGY AGENCY. Dosimetry in diagnostic radiology: an internation-al code of practice. Viena: IAEA, 2007. TRS Serie 457.

AMERICAN ASSOCIATION OF PHYSICISTS IN MEDICE. Comprehensive methodology for the evaluation of radiation dose in X-Ray computed tomography. Maryland: AAPM, 2010. Report 111.

NATIONAL INSTITUTE OF STANDARD AND TECNOLOGY. Values of the mass attenuation coef-ficient, μ/ρ, 2016. Disponivel em: <http://physics.nist.gov/PhysRefData/XrayMassCoef/tab4.html>. Acesso em: 12 nov 2016.

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Published

2019-01-28

Issue

Section

Simposio Internacional sobre Protección Radiológica en Medicina - Arequipa 2017

How to Cite

COMPARATIVE DOSIMETRIC STUDY IN CHEST COMPUTED TOMOGRAPHY USING PHANTOMS. Brazilian Journal of Radiation Sciences, Rio de Janeiro, Brazil, v. 7, n. 1A (Suppl.), 2019. DOI: 10.15392/bjrs.v7i1A.342. Disponível em: https://bjrs.org.br/revista/index.php/REVISTA/article/view/342. Acesso em: 24 dec. 2024.

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