Optmization of exposure parameters in digital mammography (CR) using figure of merit

Isabela Soares de Morais; Peterson Lima Squair; Maria do Socorro Nogueira Tavares

doi:10.15392/bjrs.v9i1A.1538

Authors

Isabela Soares de Morais Centro de Desenvolvimento da Tecnologia Nuclear
Peterson Lima Squair CDTN - Centro de Desenvolvimento da Tecnologia Nuclear
Maria do Socorro Nogueira Tavares CDTN - Centro de Desenvolvimento da Tecnologia Nuclear

DOI:

https://doi.org/10.15392/bjrs.v9i1A.1538

Keywords:

Figure of merit, Mammografhy, Optimization

Abstract

A high diagnostic standard associated with the lowest radiation dose possible for the patient is the aim for a quality examination in mammography, this can be achieved through the Figure of Merit which is a parameter used for optimization in digital mammography. The objective of this work is to determine the optimized radiographic technique (kV and anode / filter combination) for the CR detection system (Computerized Radiography), using the parameter of the figure of merit (FOM), from the contrast noise Ratio (CNR) and the average glandular dose (AGD), with two breast simulators (PMMA and CIRS) and perform a comparison between them. The optimization process was performed on the Siemens Mammomat 3000 Nova Mammograph and the Kodak Direct View CR 850 System CR scanning system using two breast, PMMA and CIRS simulators in the following thicknesses: 2, 4.5 and 7 cm. In order to calculate the AGD, the incident air kerma (Ka,i) was measured and the X-ray beam characteristic factors were applied, according to the technical parameters used for each exposure performed in the simulators. With the values of AGD and CNR associated with each image, the technique optimized for the mammograph-CR set was calculated using the figure of merit. Both simulators presented similar FOM for the conditions tested, but should not be considered equivalent. The following X-ray spectra were selected (anode / filter combination): 2 cm thick (Mo / Mo), 4.5 cm thick (W / Rh) and 7 cm (W / Rh). The estimated doses referring to the optimized techniques found in this work respected the acceptable reference levels in international protocols for quality control in mammography.

Views: 168
PDF Downloads: 211

Downloads

Download data is not yet available.

References

REFERENCES

INCA - Instituto Nacional do Câncer José Alencar Gomes da Silva, Brasil. <http://www2.inca.gov.br/wps/wcm/connect/inca/portal/home>. Last accessed: 10 jun. 2019.

BEZERRA, H.S.; MELO, T. F. V.; BARBOSA, J. V. ; FEITOSA, E. E. L. C. ; SOUZA, L. C. M. Avaliação do acesso em mamografias no Brasil e indicadores socioeconômicos: um estudo espacial. Rev. Gaúcha Enfermagem, v.39, p. 1-9, 2018.

GIULIANO, A. E. Mama. In. WAY, L. W.; DOHERT, G. M. Cirurgia: Diagnóstico & Tratamento, Rio de Janeiro: Guanabara Koogan, 2010.p 264-280.

Protection., I.C.o.R., 1990 Recommendations of the International Commission on Radiological Protection. ICRP Publication 60, 1991. 21: p. 1-201.

WILLIAMS, M. B.; PRIYA, R.; MITALI, J. M.; SEIBERT, J. A.; KWAN, A.; LO, J. Y.; SAMEI, E.; RANGER, N. T.; FAJARDO, L. L.; MCGRUDER, A.; MCGRUDER, S. M.; MAIDMENT, A. D. A; YAFFE, M. J.; BLOOMQUIST, A.; MAWDSLEY, G. E. Optimization of exposure parameters in full field digital mammography. Med Phys. v. 35, p. 2414-23, 2008.

BORG, M.; BARD, I.; ROYLE, G.J. The use of figure-of-merit (FOM) for optimization in digital mammography: A literature review, Radiation Protection Dosimetry, v. 151, p. 81-88, 2012.

Routine quality control tests for full field digital mammography systems - Fourth Edition (NHSBSP Equipment Report 1303). Sheffield: NHS Cancer Screening Programmes, 2013.

DANCE, D.R.; SKINNER, C.L.; YOUNG, K.C; BECKETT, J. R.; KOTRE, C. J. Additional factors for the estimation of mean glandular breast dose using the UK mammography dosimetry protocol. Phys. Med. Biol. v. 45, p. 3225-3240, 2000.

CEC - Commission of the European Communities. Directrices europeas para la garantía de calidad del cribado y diagnóstico del cáncer de mama. Cuarta edición (Luxembourg: CEC). 2006.

PEREZ, A. M. M. M. ; POLETTI, M. E. ; TOMAL, A.; CORREIA, P. D.; PACIÊNCIA R. D.; SILVA, M. C. Estudo da Otimização em Sistemas de Mamografia Digital CR e DR. Revista Brasileira de Física Médica, v. 11 , p.11-15, 2017.

Suporte ao Minitab 18. Interpretar os principais resultados para Correlação, <https://support.minitab.com/pt-br/minitab/18/help-and-how-to/statistics/basic statistics/how-to/correlation/interpret-the-results/key-results/#step-3-examine-the-monotonic-relationship-between-variables-spearman> Last accessed: 10 jun. 2019.

M. Chevalier, P.M. Penco, J.J.M. Echevarne, R.T. Cabrera, Protocolo para el Control de Calidad de los Sistemas Digitales Mamográficos. p.24, 2002.

BORG, M. ; KONSTANTINIDIS, A. Alternative Figures of Merit in Digital Mammography. Radiation Protection Dosimetry. v. 176, p. 388–399, 2017.

HERNÁNDEZ, J. M, C.; MIRALLES, P. G.; PEÑALVER, M. D. S.; MUÑOZ N. L.; ESTEBAN, J. M. C.; BLANCA, J. I. V. Introducción de una figura de mérito para laevaluación conjunta de la calidad de imagen y la dosimetría en mamografía digital. Rev Fis Med, v. 19, p.103-9, 2018.

IZDIHAR, K. ; KANAGA, K. C.; KRISHNAPILLAI, V.; SULAIMAN, T., Determination of Tube Output (kVp) and Exposure Mode for Breast Phantom of Various Thicknesses/Glandularity for Digital Mammography, Medical Journal of Malaysia, v. 22, p. 40-49, 2014.

KANAGA, K. C. ; YAP, H. H.; LAILA, S. E.; SULAIMAN, T.; ZAHARAH, M.; SHANTINI M, A. A. A critical comparison of three full field digital mammography systems using figure of merit. Medical Journal of Malaysia, v. 65, p. 119-122, 2010.

MERAD, A.; SAADI, S.; KHELASSI-TOUTAOUIL, N. Comparison of Two Full Field Digital Mammography Systems: Image Quality and Radiation Dose. AIP Conference Proceedings, p. 1-4, 2018.