Linear attenuation coefficients from breast-equivalent materials (CIRS and PMMA) using CdTe detector applying MCNPx simulations spectra correction

P. L. Squair; B. M. Mendes; P. M. C. Oliveira; L. F. Souza; M. S. Nogueira M.D.

doi:10.1117/12.2564000

22 May 2020 Linear attenuation coefficients from breast-equivalent materials (CIRS and PMMA) using CdTe detector applying MCNPx simulations spectra correction

P. L. Squair, B. M. Mendes, P. M. C. Oliveira, L. F. Souza, M. S. Nogueira M.D.

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Proceedings Volume 11513, 15th International Workshop on Breast Imaging (IWBI2020); 115131N (2020) https://doi.org/10.1117/12.2564000
Event: Fifteenth International Workshop on Breast Imaging, 2020, Leuven, Belgium

Abstract

Evaluation of the performance of all mammographic equipment requires the imaging and interpretation of test objects or phantoms and risk evaluation. The Mean glandular dose (MGD) is the relevant quantity for dosimetric regulatory actions in screening mammography and its evaluated usually obtained with a polymethylmethacrylate (PMMA) phantom. This study evaluated by spectrometry technique the linear attenuation coefficients by transmitted intensity of commercially tissue-equivalent phantom for mammography, Computerized Imaging Reference System (CIRS) with different glandularity-adipose content (0-100, 30-70, 50-50, 70-70 and 100-0) % and PMMA. The measurements were realized with x-ray beams produced by Mo/Mo, Mo/Rh and W/Rh. The results are available for the x-ray characteristic photo-peaks (k_α1 Mo 17.48 keV and k_α2 Mo 19.61 keV). For spectrometry measurements use an AMPTEK XR-100T Cadmium Telluride (CdTe) detector. Simulations using the MCNPx Monte Carlo code were performed to evaluate the detector response. The results of corrections performed using the methodology presented here were compared with spectra corrected by other authors, for validation purposes. The comparisons showed that this methodology was adequate for the correction of spectra from 2 keV to 200 keV. The results of linear attenuation coefficients here were compared with experimental and theoretical values that were previously reported. In this work we show the adequacy of the results found for PMMA and CIRS 50-50 compared. In addition, it brings the evaluation of the attenuation coefficient for kα2 Mo with 19.61 keV for all CIRS combinations.

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P. L. Squair, B. M. Mendes, P. M. C. Oliveira, L. F. Souza, and M. S. Nogueira M.D. "Linear attenuation coefficients from breast-equivalent materials (CIRS and PMMA) using CdTe detector applying MCNPx simulations spectra correction", Proc. SPIE 11513, 15th International Workshop on Breast Imaging (IWBI2020), 115131N (22 May 2020); https://doi.org/10.1117/12.2564000

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KEYWORDS

Sensors

Signal attenuation

Photons

Polymethylmethacrylate

Monte Carlo methods

X-rays

Spectroscopy

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