Department of Physics, College of Science, Princess Nourah Bint Abdulrahman University, Riyadh, Saudi Arabia.
Medical Diagnostic Imaging Department, College of Health Sciences, University of Sharjah, Sharjah, United Arab Emirates.
Front Public Health. 2023 Mar 3;11:1136864. doi: 10.3389/fpubh.2023.1136864. eCollection 2023.
We report the breast and chest radiation dose assessment for mammographic examinations using a three-layer heterogeneous breast phantom through the MCNPX Monte Carlo code.
A three-layer heterogeneous phantom along with compression plates and X-ray source are modeled. The validation of the simulation code is obtained using the data of AAPM TG-195 report. Deposited energy amount as a function of increasing source energy is calculated over a wide energy range. The behavioral changes in X-ray absorption as well as transmission are examined using the F6 Tally Mesh extension of MCNPX code. Moreover, deposited energy amount is calculated for modeled body phantom in the same energy range.
The diverse distribution of glands has a significant impact on the quantity of energy received by the various breast layers. In layers with a low glandular ratio, low-energy primary X-ray penetrability is highest. In response to an increase in energy, the absorption in layers with a low glandular ratio decreased. This results in the X-rays releasing their energy in the bottom layers. Additionally, the increase in energy increases the quantity of energy absorbed by the tissues around the breast.
我们通过 MCNPX 蒙特卡罗代码报告了使用三层非均匀乳房模型进行乳房 X 光检查的乳房和胸部辐射剂量评估。
对三层非均匀模型以及压迫板和 X 射线源进行建模。使用 AAPM TG-195 报告中的数据来验证模拟代码的有效性。在较宽的能量范围内计算随源能量增加而增加的沉积能量量。使用 MCNPX 代码的 F6 Tally Mesh 扩展检查 X 射线吸收和传输的行为变化。此外，在相同的能量范围内计算了建模体模型的沉积能量量。
腺体的不同分布对各乳房层接收到的能量数量有重大影响。在腺体比例较低的层中，低能初级 X 射线穿透性最高。随着能量的增加，低腺体比例层中的吸收减少。这导致 X 射线在底层释放能量。此外，能量的增加增加了乳房周围组织吸收的能量量。
