Medical Physics Department, Medical School, University of Athens, 75 Mikras Asias Str., Goudi, 11527 Athens, Greece.
Medical Physics Department, Medical School, University of Athens, 75 Mikras Asias Str., Goudi, 11527 Athens, Greece.
Phys Med. 2014 Jun;30(4):432-6. doi: 10.1016/j.ejmp.2013.12.003. Epub 2013 Dec 25.
To estimate the organ equivalent doses and the effective doses (E) in patient undergoing percutaneous transhepatic biliary drainage (PTBD) examinations, using the MCNP5 and PCXMC2 Monte Carlo-based codes.
The purpose of this study is to estimate the organ doses to patients undergoing PTBD examinations by clinical measurements and Monte Carlo simulation. Dose area products (DAP) values were assessed during examination of 43 patients undergoing PTBD examination separated into groups based on the gender and the dimensions and location of the beam.
Monte Carlo simulation of photon transport in male and female mathematical phantoms was applied using the MCNP5 and PCXMC2 codes in order to estimate equivalent organ doses. Regarding the PTBD examination the organ receiving the maximum radiation dose was the lumbar spine. The mean calculated HT for the lumbar spine using the MCNP5 and PCXMC2 methods respectively, was 117.25 mSv and 131.7 mSv, in males. The corresponding doses were 139.45 mSv and 157.1 mSv respectively in females. The HT values for organs receiving considerable amounts of radiation during PTBD examinations were varied between 0.16% and 73.2% for the male group and between 1.10% and 77.6% for the female group. E in females and males using MCNP5 and PCXMC2.0 was 5.88 mSv and 6.77 mSv, and 4.93 mSv and 5.60 mSv.
The doses remain high compared to other invasive operations in interventional radiology. There is a reasonable good coincidence between the MCNP5 and PCXMC2.0 calculation for most of the organs.
使用基于 MCNP5 和 PCXMC2 的蒙特卡罗代码估算接受经皮经肝胆道引流 (PTBD) 检查的患者的器官等效剂量和有效剂量 (E)。
本研究旨在通过临床测量和蒙特卡罗模拟估算接受 PTBD 检查的患者的器官剂量。在对 43 名接受 PTBD 检查的患者进行检查时，根据性别以及射束的尺寸和位置将剂量面积产物 (DAP) 值分为组进行评估。
使用 MCNP5 和 PCXMC2 代码对男性和女性数学体模中的光子传输进行蒙特卡罗模拟，以估算等效器官剂量。对于 PTBD 检查，接受最大辐射剂量的器官是腰椎。使用 MCNP5 和 PCXMC2 方法分别计算的腰椎平均 HT 值男性为 117.25 mSv 和 131.7 mSv，女性分别为 139.45 mSv 和 157.1 mSv。在 PTBD 检查期间接受大量辐射的器官的 HT 值在男性组中为 0.16%至 73.2%之间，在女性组中为 1.10%至 77.6%之间。使用 MCNP5 和 PCXMC2.0 的女性和男性的 E 值分别为 5.88 mSv 和 6.77 mSv，4.93 mSv 和 5.60 mSv。
与介入放射学中的其他侵入性操作相比，剂量仍然很高。对于大多数器官，MCNP5 和 PCXMC2.0 计算之间存在很好的一致性。
