Dosimetry and optimization in digital radiography based on the contrast-detail resolution

Authors

  • Wilson Otto Gomes Batista IFBA
  • Alexandre Gomes de Carvalho Secretaria de Saúde do Estado da Bahia

DOI:

https://doi.org/10.15392/bjrs.v6i3.467

Keywords:

Contrast-Details, Optimization, Dosimetry

Abstract

Contrast-detail (C-D) curves are useful in evaluating the radiographic image quality in a global way. The objective of the present study was to obtain the C-D curves and the inverse image quality figure. Both of these parameters were used as an evaluation tool for abdominal and chest imaging protocols. The C-D curves were obtained with the phantom CDRAD 2.0 in computerized radiography and the direct radiography systems (including portable devices). The protocols were 90 and 102 kV in the range of 2 to 20 mAs for the chest and 80 kV in the range of 10 to 80 mAs for the abdomen. The incident air kerma values were evaluated with a solid state sensor. The analysis of these C-D curves help to identify which technique would allow a lower value of the entrance surface air kerma, Ke, while maintaining the image quality from the point of view of C-D detectability. The results showed that the inverse image quality figure, IQFinv, varied little throughout the range of mAs, while the value of Ke varied linearly directly with the mAs values. Also, the complete analysis of the curves indicated that there was an increase in the definition of the details with increasing mAs. It can be concluded that, in the transition phase for the use of the new receptors, it is necessary to evaluate and adjust the practised protocols to ensure, at a minimum, the same levels of the image quality, taking into account the aspects of the radiation protection of the patient.

Downloads

Download data is not yet available.

References

ICRP. Managing patient dose in digital radiology. A report of the International Commission on Radiological Protection. Annals of the ICRP 2004;34(1):1-73.

VANO, Eliseo. ICRP recommendations on “managing patient dose in digital radiology”. Radiation Protection Dosimetry v. 114, n. 1–3, p. 126–130, 2005.

BACHER, Klaus et al. Image quality and radiation dose on digital chest imaging: Comparison of amorphous silicon and amorphous selenium flat-panel systems. American Journal of Roentgenology v. 187, n. 3, p. 630–637 , 2006.

BUSHONG, Stewart C. Ciência Radiológica para Tecnólogos. 9. ed. [S.l.]: Elsevier, 2010. 728 p. .9788535237320.

BUSHBERG, Jonh. The Essencial of Physics of Medical Imaging. 2nd. ed. [S.l.]: Lippincott Williams and Wilkins, 2002. .

LU, Z.F., NICKOLOFF, E.L., SO, J.C., DUTTA, A.K. Comparison of computed radiography and film/screen combination using a contrast-detail phantom. Journal of Applied Clinical Medical Physics v. 4, n. S.I., p. 91–98 , 2003.

MORANT, J.J., CHAVALIER, M. SALVADÓ, M. MORÁN, P. LOPEZ, M. Procedimento de Ajuste Del Control Aumotático de la Exposición en Sistemas de Radiología Digital Computadorizada. In: XI Congreso Nacional de la Sociedad Española de Protección Radiológica 2007, Tarragona, España, Annals, Tarragona: Sociedad Española de Protección Radiológica [S.l: s.n.], 2007. p.1–4.

INTERNATIONAL ATOMIC ENERGY AGENCY. Dosimetry in Diagnostic Radiology: An International Code of Practice. Vienna: INTERNATIONAL ATOMIC ENERGY AGENCY, 2007. Disponível em: <http://www-pub.iaea.org/books/IAEABooks/7638/Dosimetry-in-Diagnostic-Radiology-An-International-Code-of-Practice>. (Technical Reports Series).

FISCHBACH, F. et al. Flat Panel Digital Radiography Compared With Storage Phosphor Computed Radiography: Assessment of Dose Versus Image Quality in Phantom Studies. Investigative Radiology v. 37, n. 11, 2002. Disponível em:<http://journals.lww.com/investigativeradiology/Fulltext/2002/11000/Flat_Panel_Digital_Radiography_Compared_With.4.aspx>.

BRASIL. MINISTÉRIO DA SAÚDE. AGÊNCIA NACIONAL DE VIGILÂNCIA SANITÁRIA. Portaria 453, 01/06/1998. Portaria SVS/MS 453, 01/06/1998 v. 1 , 1998. Disponível em: .9788578110796.

VOGIATZI, S. et al. Guidance on diagnostic reference levels (DRLs) for medical exposures. Radiation Protection Dosimetry v. 80, n. 1, p. 1–26 , 1998. Disponível em: <http://scholar.google.com/scholar?hl=en&btnG=Search&q=intitle:Guidance+on+Diagnostic+Reference+Levels+(DRLs)+for+Medical+Exposures#0>.0025900705725.

TAVARES, A. J. P. Efeito dos parâmetros técnicos na dose e qualidade de imagem num sistema de radiografia computadorizada. Instituto Politécnico de Lisboa, 2013. 99 p. Disponível em: <http://docplayer.com.br/6754208-Instituto-politecnico-de-lisboa-escola-superior-de-tecnologia-da-saude-de-lisboa.html>.

Downloads

Published

2018-09-04

Issue

Section

Articles

How to Cite

Dosimetry and optimization in digital radiography based on the contrast-detail resolution. Brazilian Journal of Radiation Sciences, Rio de Janeiro, Brazil, v. 6, n. 3, 2018. DOI: 10.15392/bjrs.v6i3.467. Disponível em: https://www.bjrs.org.br/revista/index.php/REVISTA/article/view/467.. Acesso em: 29 mar. 2024.

Similar Articles

1-10 of 255

You may also start an advanced similarity search for this article.