Optimization of the exposure parameters in digital mammography using contrast-detail metrics
Purpose: Optimization studies in digital mammography aid to assure the image quality and radiological protection of the patient. The aim of this work is to test effectiveness and applicability of a method based on a Figure of Merit (FOM = (IQFinv)2/AGD) to improve all the exposure parameters (Target...
| Autor Principal: | Rojas, Leidy J. |
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| Otros Autores: | Fausto, Agnes M.F., Mol, Anderson W., Velasco, Fermin G., Abreu, P.O.S., Henriques, G., Furquim, T.A.C. |
| Formato: | Generación de Nuevo Conocimiento: Artículos publicados en revistas especializadas - Electrónicos |
| Publicado: |
2019
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| Materias: | |
| Acceso en línea: |
Rojas, L. J., Fausto, A. M. F., Mol, A. W., Velasco, F. G., Abreu, P. O. S., Henriques, G., & Furquim, T. A. C. (2017). Optimization of the exposure parameters in digital mammography using contrast-detail metrics. Bogotá: doi:10.1016/j.ejmp.2017.08.001 |
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| Sumario: |
Purpose: Optimization studies in digital mammography aid to assure the image quality and radiological protection of the patient. The aim of this work is to test effectiveness and applicability of a method based on a Figure of Merit (FOM = (IQFinv)2/AGD) to improve all the exposure parameters (Target/Filter combination, kVp and mAs) in order to improve the image acquisition technique that will provide the best compromise between image quality and the average glandular dose (AGD).
Methods: A contrast-detail analysis, employing the test object CDMAM, was carried out for the digital
mammography unit manufactured by Lorad Hologic – model Selenia. We simulated two breast thicknesses
using phantoms and a Figure of Merit as optimization tool, which includes an indicator of image
quality, the IQFinv and the average glandular dose. Images of the ACR and TORMAM phantoms were
obtained with both, automatic and optimized exposure parameters. In order to compare the image quality,
the SNR (Signal to Noise Ratio) was measured in each image.
Results: In the two phantoms, for both 4.5 and 7.5 cm thicknesses, the AGDs obtained with the optimized
parameters show a reduction. In addition, the images obtained with the optimized exposure parameters,
had the same or a better image quality when compared to the images obtained using the automatic
mode.
Conclusions: The proposed optimization methodology proved to be an effective tool to improve the digital
mammography unit, due to the use of objective metrics for evaluation and validation of the results. |
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