Ubeda Carlos, Salazar Luisa, Retana Viviana, Santos Freddy, Salvador Lourdes, Sáenz Carlos, Quesada Cristhian, Gavarrete Manuel, Picado Marcela, Arce Luis
Medical Technology Department, Study Center in Radiological Sciences (CECRAD), Health Sciences Faculty, Tarapaca University, Arica, Chile.
Quality Control and Radiological Protection Department, Social Security, San Jose, Costa Rica.
Radiat Prot Dosimetry. 2017 Nov 1;176(4):450-455. doi: 10.1093/rpd/ncx031.
This paper presents the results of the first characterization and experimental measurements of scatter dose at cardiologist's eyes for the only X-ray system that performs all paediatric Interventional cardiology procedures in Costa Rica. Entrance surface air kerma (ESAK) and the scatter dose values were measured on phantoms of 4-20 cm thicknesses of polymethyl methacrylate slabs. Image quality was evaluated using DICOM images of a test object Leeds TOR 18-FG, through the numerical parameters signal-to-noise ratio (SNR), high-contrast spatial resolution (HCSR) and figure of merit (FOM). When PMMA thickness is increased and during a move from low fluoroscopy to cine modes, ESAK, SNR, HCSR and FOM values range from 0.44 to 391.0 μGy fr-1; 2.8 to 14.89; 3.17 to 15.54 and 0.51 to 79.94, respectively. The highest scattered dose rates recorded during the simulations were 1.79 and 8.04 mSv h-1 for the high fluoroscopy and cine modes, respectively.
本文介绍了对哥斯达黎加唯一一台执行所有儿科介入心脏病学程序的X射线系统，在心脏病专家眼部进行散射剂量的首次特性描述和实验测量的结果。在厚度为4 - 20厘米的聚甲基丙烯酸甲酯平板模型上测量了入射表面空气比释动能（ESAK）和散射剂量值。通过测试物体利兹TOR 18 - FG的DICOM图像，利用数值参数信噪比（SNR）、高对比度空间分辨率（HCSR）和品质因数（FOM）来评估图像质量。当聚甲基丙烯酸甲酯厚度增加以及从低剂量透视模式转换到电影模式时，ESAK、SNR、HCSR和FOM值分别在0.44至391.0μGy fr-1；2.8至14.89；3.17至15.54以及0.51至79.94范围内。模拟过程中记录的高剂量透视和电影模式下的最高散射剂量率分别为1.79和8.04 mSv h-1。
