Evaluation of glandular dose in mammography in presence of breast cysts using Monte Carlo simulation

IF 0.7 Q4 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Polish Journal of Medical Physics and Engineering Pub Date : 2021-03-01 DOI:10.2478/pjmpe-2021-0006
M. Deevband, Z. Kaveh, M. Ghorbani, B. Khajetash
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Abstract

Abstract Background: Normalized glandular dose (DgN) is an important dosimetric quantity in mammography. Aim: In this study, the effect of the presence of breast cysts and their size, number and location on DgN is evaluated. Materials and methods: The effect of the presence of cysts in breast was examined using MCNPX code. This was performed by taking homogeneous breast phantoms containing spheroid breast cysts into account. The radius of the cysts, numbers of the cysts, and depth of the cysts, and their location were variable. Various electron energies were also considered. Finally, these results were compared with the results of a cyst-less breast phantom. Results: The results show that the effect of the presence of cysts in the breast depends on the size, number and location of cysts. The presence of cysts at lower depths leads to a decrease in the DgN values, compared to the breast phantom without cysts. The presence of cysts in the breast phantom has an effect of -7 to +14 percent on the DgN values under the conditions considered in this modeling. This effect is independent of the X-ray tube voltage, the breast phantom thickness, and glandular ratio, and depends only on the number and size and location of the cysts. The bigger radius and number of cysts, the greater effect on DgN value.
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用蒙特卡罗模拟评估乳腺囊肿存在时乳腺x线摄影中腺体剂量
背景:归一化腺剂量(DgN)是乳房x光检查中一项重要的剂量计量指标。目的:本研究探讨乳腺囊肿的存在及其大小、数量和位置对DgN的影响。材料与方法:采用MCNPX编码检测乳腺囊肿存在的影响。这是通过考虑含有球形乳腺囊肿的均匀乳腺幻象来实现的。囊肿的半径,囊肿的数量,囊肿的深度和它们的位置是可变的。还考虑了不同的电子能量。最后,将这些结果与无囊肿乳房假影的结果进行比较。结果:乳腺囊肿存在的效果取决于囊肿的大小、数量和位置。与没有囊肿的乳腺幻影相比,较低深度囊肿的存在导致DgN值下降。在本模型中考虑的条件下,乳腺幻膜中囊肿的存在对DgN值的影响为- 7%至+ 14%。这种效果与x射线管电压、乳腺幻膜厚度和腺体比例无关,而仅取决于囊肿的数量、大小和位置。囊肿半径越大、数量越多,对DgN值的影响越大。
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来源期刊
Polish Journal of Medical Physics and Engineering
Polish Journal of Medical Physics and Engineering RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING-
CiteScore
1.30
自引率
0.00%
发文量
19
期刊介绍: Polish Journal of Medical Physics and Engineering (PJMPE) (Online ISSN: 1898-0309; Print ISSN: 1425-4689) is an official publication of the Polish Society of Medical Physics. It is a peer-reviewed, open access scientific journal with no publication fees. The issues are published quarterly online. The Journal publishes original contribution in medical physics and biomedical engineering.
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