Longo Mariaconcetta, Marchioni Chiara, Insero Teresa, Donnarumma Raffaella, D'Adamo Alessandro, Lucatelli Pierleone, Fanelli Fabrizio, Salvatori Filippo Maria, Cannavale Alessandro, Di Castro Elisabetta
Post Graduate School of Medical Physics, Sapienza University of Rome, Rome, Italy
Post Graduate School of Medical Physics, Sapienza University of Rome, Rome, Italy.
Radiat Prot Dosimetry. 2016 Mar;168(4):509-15. doi: 10.1093/rpd/ncv362. Epub 2015 Jul 25.
This study evaluates X-ray exposure in patient undergoing abdominal extra-vascular interventional procedures by means of Digital Imaging and COmmunications in Medicine (DICOM) image headers and Monte Carlo simulation. The main aim was to assess the effective and equivalent doses, under the hypothesis of their correlation with the dose area product (DAP) measured during each examination. This allows to collect dosimetric information about each patient and to evaluate associated risks without resorting to in vivo dosimetry. The dose calculation was performed in 79 procedures through the Monte Carlo simulator PCXMC (A PC-based Monte Carlo program for calculating patient doses in medical X-ray examinations), by using the real geometrical and dosimetric irradiation conditions, automatically extracted from DICOM headers. The DAP measurements were also validated by using thermoluminescent dosemeters on an anthropomorphic phantom. The expected linear correlation between effective doses and DAP was confirmed with an R(2) of 0.974. Moreover, in order to easily calculate patient doses, conversion coefficients that relate equivalent doses to measurable quantities, such as DAP, were obtained.
本研究通过医学数字成像和通信（DICOM）图像头文件及蒙特卡罗模拟，评估接受腹部血管外介入手术患者的X射线照射情况。主要目的是在假设有效剂量和当量剂量与每次检查时测量的剂量面积乘积（DAP）相关的情况下，评估有效剂量和当量剂量。这使得能够收集每位患者的剂量学信息，并在不借助体内剂量测定法的情况下评估相关风险。通过蒙特卡罗模拟器PCXMC（一个基于个人计算机的用于计算医学X射线检查中患者剂量的蒙特卡罗程序），利用从DICOM头文件中自动提取的真实几何和剂量学照射条件，对79例手术进行了剂量计算。还通过在拟人化体模上使用热释光剂量计对DAP测量进行了验证。有效剂量与DAP之间预期的线性相关性得到证实，决定系数R(2)为0.974。此外，为了方便计算患者剂量，还获得了将当量剂量与可测量量（如DAP）相关联的转换系数。
