Ubeda C, Vano E, Miranda P, Leyton F, Valenzuela E, Oyarzun C
Clinical Sciences Department, Health Sciences Faculty and CIHDE, Tarapaca University, Arica, Chile.
Radiat Prot Dosimetry. 2011 Sep;147(1-2):90-3. doi: 10.1093/rpd/ncr276. Epub 2011 Jul 9.
The aim of this work was to investigate the differences in dose settings and image quality among 10 X-ray systems used for interventional cardiology in Chile. Entrance surface air kerma (ESAK) was measured on a phantom of 20 cm thickness of polymethyl methacrylate slabs. Image quality was evaluated using DICOM images of a test object Leeds TOR 18-FG for cine mode acquisition, through the numerical parameters signal-to-noise ratio (SNR), high-contrast spatial resolution (HCSR) and figure of merit. ESAK rate values for fluoroscopy modes ranged between 7.1 and 121.7 mGy min(-1). For cine mode, ESAK values per frame ranged from 63 to 400 µGy fr(-1). SNR and HCSR parameters for cine mode varied from 4.8 to 8.6 and 0.4 to 10, respectively. FOM values resulted from 6.9 to 64.5 among the different X-ray systems. Results show important differences between systems and point out the need to launch an optimisation programme.
这项工作的目的是调查智利用于介入心脏病学的10台X射线系统在剂量设置和图像质量方面的差异。在厚度为20厘米的聚甲基丙烯酸甲酯平板模型上测量入射表面空气比释动能（ESAK）。通过数值参数信噪比（SNR）、高对比度空间分辨率（HCSR）和品质因数，使用用于电影模式采集的测试物体利兹TOR 18-FG的DICOM图像评估图像质量。透视模式的ESAK率值在7.1至121.7 mGy min⁻¹之间。对于电影模式，每帧的ESAK值范围为63至400 µGy fr⁻¹。电影模式的SNR和HCSR参数分别从4.8变化到8.6和从0.4变化到10。不同X射线系统的品质因数（FOM）值在6.9至64.5之间。结果显示了系统之间的重要差异，并指出需要启动一个优化计划。
