Influence of the antiscatter grid on dose and image quality in pediatric interventional cardiology X-ray systems
Influence of the antiscatter grid on dose and image quality in pediatric interventional cardiology X-ray systems
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DOI：
10.1002/ccd.24602
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发表时间：
2013-07-01
影响因子：
2.3
通讯作者：
Miranda, Patricia
中科院分区：
文献类型：
--
作者：
Ubeda, Carlos;Vano, Eliseo;Miranda, Patricia
目的介绍一种方法和实验结果，以评估反散射栅格(AG)在儿科心脏病X光系统中对剂量和图像质量的影响。方法采用不同厚度的聚甲基丙烯酸甲酯(PMMA)作为实验对象，对3种不同采集方案的进气表面比释动能和图像质量进行测量，并分别在透视和电影模式下进行测量。评价图像质量参数、信噪比(SNR)、高对比度空间分辨率(HCSR)和两项优值系数(FOM)。结果实验中测得4、8、12、16 cm PMMA的巴基系数平均值分别为1.99、2.49、2.85、3.30。当移除AG时，SNR变化似乎并不重要。然而，AG的使用显著改善了HCSR。用4厘米的PMMA对测试对象成像似乎不使用AG，但对于8厘米(相当于12厘米的胸厚)和更大的厚度，良好的图像质量将需要使用AG。结论AG不宜用于胸厚小于或等于6 cm、体重小于6 kg的新生儿和幼儿。(C)2013年威利期刊公司。
Objective To present a methodology and experimental results to assess the influence, in terms of dose and image quality, of the antiscatter grid (AG) in a pediatric cardiology X-ray system. Method Entrance surface air kerma and image quality, using a test object and different added thicknesses of polymethyl methacrylate (PMMA), for three different acquisition protocols, were measured with and without the AG, for fluoroscopy and cine modes. The image quality parameters, signal-to-noise ratio (SNR), high-contrast spatial resolution (HCSR) and two figures of merit (FOM) were evaluated. Results The average bucky factor values measured during this experiment were 1.99, 2.49, 2.85, and 3.30, respectively for 4, 8, 12, and 16 cm of PMMA. SNR variations do not appear to be relevant when removing the AG. However, the use of AG improves HCSR significantly. Imaging the test object with 4 cm of PMMA seems appropriate without the AG, but for 8 cm (equivalent to chest thicknesses of 12 cm) and greater thicknesses, a good image quality would require the use of AG. Conclusions The AG should not be used for neonates and very young children with chest thicknesses equal to or less than 6 cm and weight less that 6 kg. (c) 2013 Wiley Periodicals, Inc.