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首页> 外文期刊>Physics in medicine and biology. >Optimization of x-ray spectra in digital mammography through Monte Carlo simulations
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Optimization of x-ray spectra in digital mammography through Monte Carlo simulations

机译：通过蒙特卡洛模拟优化数字化乳腺摄影中的X射线光谱

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In this work, a Monte Carlo code was used to investigate the performance of different x-ray spectra in digital mammography, through a figure of merit (FOM), defined as , with CNR being the contrast-to-noise ratio in image and being the average glandular dose. The FOM was studied for breasts with different thicknesses t (2 cm ≤ t ≤ 8 cm) and glandular contents (25%, 50% and 75% glandularity). The anode/filter combinations evaluated were those traditionally employed in mammography (Mo/Mo, Mo/Rh, Rh/Rh), and a W anode combined with Al or K-edge filters (Zr, Mo, Rh, Pd, Ag, Cd, Sn), for tube potentials between 22 and 34 kVp. Results show that the W anode combined with K-edge filters provides higher values of FOM for all breast thicknesses investigated. Nevertheless, the most suitable filter and tube potential depend on the breast thickness, and for t ≥ 6 cm, they also depend on breast glandularity. Particularly for thick and dense breasts, a W anode combined with K-edge filters can greatly improve the digital technique, with the values of FOM up to 200% greater than that obtained with the anode/filter combinations and tube potentials traditionally employed in mammography. For breasts with t < 4 cm, a general good performance was obtained with the W anode combined with 60 m of the Mo filter at 2425 kVp, while 60 m of the Pd filter provided a general good performance at 2426 kVp for t = 4 cm, and at 2830 and 2931 kVp for t = 6 and 8 cm, respectively.
机译：在这项工作中，使用蒙特卡罗代码通过品质因数（FOM）（定义为）来研究数字乳腺摄影术中不同X射线光谱的性能，其中CNR是图像中的对比度和噪声比，平均腺体剂量。对具有不同厚度t（2 cm≤t≤8 cm）和腺内容物（25％，50％和75％腺体）的乳房进行了FOM研究。评估的阳极/过滤器组合是传统上用于乳腺X射线照相术的那些（Mo / Mo，Mo / Rh，Rh / Rh），以及与Al或K边缘过滤器（Zr，Mo，Rh，Pd，Ag，Cd）结合的W阳极（Sn），用于22至34 kVp之间的管电位。结果表明，W阳极与K边缘过滤器相结合可为所有研究的乳房厚度提供更高的FOM值。然而，最合适的过滤器和管子的电势取决于乳房的厚度，对于t≥6 cm，它们也取决于乳房的腺体。特别是对于厚而密实的乳房，W阳极与K边缘过滤器相结合可以极大地改善数字技术，其FOM值比在乳房X线照相术中使用的阳极/过滤器组合和管电势所获得的值高200％。对于t <4 cm的乳房，在2425 kVp时将W阳极与60 m的Mo滤光片组合使用可获得总体良好的性能，而对于t = 4 cm的60 m的Pd滤光片在2426 kVp处可获得总体良好的性能。 ，分别在2830和2931 kVp时t = 6和8 cm。

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