Ben Abdennebi A, Aubry S, Ounalli L, Fayache M S, Delabrousse E, Petegnief Y
Regional and University Hospital of Besançon, 25000 Besançon, France; Faculty of Mathematical, Physical and Natural Sciences of Tunis, 2092 El Manar, Tunis, Tunisia; Laboratory on Energy and Matter for Nuclear Sciences Development, LR16CNSTN02, Tunisia.
Regional and University Hospital of Besançon, 25000 Besançon, France; Nanomedicine Lab Imagery and Therapeutics EA 4662, University of Franche-Comte, 25000 Besancon, France.
Phys Med. 2017 Jan;33:77-86. doi: 10.1016/j.ejmp.2016.12.008. Epub 2016 Dec 18.
To estimate fetal absorbed doses for pregnant women pelvimetry, a comparative study between EOS imaging system and low-dose spiral CT-scanner was carried out. For this purpose three different studies were investigated: in vivo, in vitro and Monte Carlo calculations.
In vivo dosimetry was performed, using OSL NanoDot dosimeters, to determine the dose to the skin of twenty pregnant women. In vitro studies were established by using a cubic phantom of water, in order to estimate the out of field doses. In the latter study, OSLDs were placed at depths corresponding to the lowest, average and highest position of the uterus. Monte Carlo calculations of effective doses to high radio-sensitive organs were established, using PCXMC and CTExpo software suites for EOS imaging system and CT-scanner, respectively.
The EOS imaging system reduces radiation exposure 4 to 8 times compared to the CT-scanner. The entrance skin doses were 74% (p-values <0.01) higher with the CT-scanner than with the EOS system. In the out of field region, the measured doses of the EOS system were reduced by 80% (p-values <0.02). Monte Carlo calculations confirmed that effective doses to organs are less accentuated for EOS than for CT pelvimetry.
The EOS system is less irradiating than the CT exam. The out-of-field dose which is significant, is lower in the EOS than in the CT-scanner and could be reduced even further by optimizing the time used for image acquisition.
为估算孕妇骨盆测量时胎儿的吸收剂量，对EOS成像系统和低剂量螺旋CT扫描仪进行了一项对比研究。为此，开展了三项不同的研究：体内研究、体外研究和蒙特卡罗计算。
使用OSL纳米点剂量计进行体内剂量测定，以确定20名孕妇皮肤所受剂量。通过使用水立方体模进行体外研究，以估算射野外剂量。在后一项研究中，将光激励发光剂量计放置在对应子宫最低、平均和最高位置的深度处。分别使用PCXMC和CTExpo软件套件对EOS成像系统和CT扫描仪进行高辐射敏感器官有效剂量的蒙特卡罗计算。
与CT扫描仪相比，EOS成像系统可将辐射暴露降低4至8倍。CT扫描仪的入射皮肤剂量比EOS系统高74%（p值<0.01）。在射野外区域，EOS系统的测量剂量降低了80%（p值<0.02）。蒙特卡罗计算证实，与CT骨盆测量相比，EOS对器官的有效剂量增加较小。
EOS系统的辐射比CT检查少。EOS的射野外剂量虽显著，但低于CT扫描仪，通过优化图像采集时间可进一步降低。
