Optmization of exposure parameters in digital mammography (CR) using figure of merit
DOI:
https://doi.org/10.15392/bjrs.v9i1A.1538Palabras clave:
Figure of merit, Mammografhy, OptimizationResumen
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.Descargas
Referencias
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.
Descargas
Publicado
Número
Sección
Licencia
Derechos de autor 2021 Brazilian Journal of Radiation Sciences (BJRS)

Esta obra está bajo una licencia internacional Creative Commons Atribución 4.0.
Licencia: los artículos de BJRS tienen una licencia internacional Creative Commons Attribution 4.0, que permite el uso, el intercambio, la adaptación, la distribución y la reproducción en cualquier medio o formato, siempre que se otorgue el crédito correspondiente al autor o autores originales y a la fuente, proporcione un enlace a la licencia Creative Commons e indique si se realizaron cambios. Las imágenes u otros materiales de terceros en el artículo están incluidos en la licencia Creative Commons del artículo, a menos que se indique lo contrario en una línea de crédito al material. Si el material no está incluido en la licencia Creative Commons del artículo y su uso previsto no está permitido por la regulación legal o excede el uso permitido, el autor deberá obtener el permiso directamente del titular de los derechos de autor. Para ver una copia de esta licencia, visite http://creativecommons.org/licenses/by/4.0/