Hadjiconstanti Anastasia C, Messaris Gerasimos A T, Thomopoulos Konstantinos C, Solomou Aikaterini G, Panayiotakis George S
Department of Medical Physics, School of Medicine, University of Patras, 265 04Patras, Greece.
Department of Gastroenterology, School of Medicine, University of Patras, 265 04Patras, Greece.
Radiat Prot Dosimetry. 2017 Jun 1;175(1):118-123. doi: 10.1093/rpd/ncw276.
A phantom-based study is presented aiming to optimise patient dose and image quality (IQ) in endoscopic retrograde cholangiopancreatography procedures, utilising a fluoroscopy system equipped with a flat panel detector. The patient thickness was simulated with various polymethyl methacrylate slabs, whilst IQ was evaluated using the Leeds test object. The main factors evaluated were phantom thickness, distance between phantom and detector, field of view and pulse rate. For all these factors, the dosemetric indices, entrance surface air kerma (ESAK) rate and ESAK per pulse, as well as the IQ parameters, signal-to-noise ratio and high contrast spatial resolution, were measured. Based on these measurements, the figure of merit (FOM) was estimated. The FOM and ESAK rate values indicated the optimum combination of the factors evaluated which could provide adequate clinical information, assuring minimum patient dose.
本文介绍了一项基于体模的研究，旨在利用配备平板探测器的荧光透视系统，优化内镜逆行胰胆管造影术的患者剂量和图像质量（IQ）。使用各种聚甲基丙烯酸甲酯板模拟患者厚度，同时使用利兹测试物体评估IQ。评估的主要因素包括体模厚度、体模与探测器之间的距离、视野和脉冲率。对于所有这些因素，测量了剂量学指标、入射表面空气比释动能（ESAK）率和每脉冲ESAK，以及IQ参数、信噪比和高对比度空间分辨率。基于这些测量结果，估计了品质因数（FOM）。FOM和ESAK率值表明所评估因素的最佳组合，该组合可以提供足够的临床信息，确保患者剂量最小。
