Investigation of image lag and modulation transfer function in fluoroscopy images obtained with a dynamic flat-panel detector
Investigation of image lag and modulation transfer function in fluoroscopy images obtained with a dynamic flat-panel detector
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DOI：
10.1007/s12194-013-0210-9
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发表时间：
2013-07-01
影响因子：
1.6
通讯作者：
Sanada, Shigeru
中科院分区：
文献类型：
--
作者：
Kawashima, Hiroki;Tanaka, Rie;Sanada, Shigeru
在临床实践中通常使用具有动态平板探测器（FPD）的数字成像。然而，有几个因素降低了荧光透视成像中目标跟踪的准确性，包括图像滞后和模糊。已经有几个报告集中在不同类型的FPD的调制传递函数（MTF），噪声功率谱（SNR）和检测量子效率（DQE）。然而，目前还没有研究比较图像滞后和MTF性能的动态图像获得间接和直接转换FPD。我们研究了使用间接转换和直接转换FPD系统获得的透视图像在几种成像条件下的图像滞后和MTF。根据IEC 62220-1-3标准，在几种条件下获得图像滞后和MTF的测量。我们研究了图像延迟和MTF是否受剂量水平和靶移动速度的影响。间接转换FPD显示出对剂量水平的依赖性，而直接转换FPD未观察到这种依赖性。此外，与直接转换FPD观察到的差异相比，间接转换FPD的静态和移动板图像之间的MTF存在很大差异。这些结果将有助于确定成像条件的目标跟踪和其他类型的动态成像。
Digital imaging with a dynamic flat-panel detector (FPD) is commonly used in clinical practice. However, several factors reduce the accuracy of target tracking in fluoroscopic imaging, including image lag and blurring. There have been several reports focusing on the modulation transfer function (MTF), noise power spectrum (NPS), and detective quantum efficiency (DQE) in different types of FPD. However, there have been no studies comparing image lag and MTF properties in dynamic images obtained with indirect-and direct-conversion FPDs. We investigated the image lag and MTF under several imaging conditions in fluoroscopic images obtained with an indirect-conversion and a direct-conversion FPD system. The measurements of image lag and MTF were obtained under several conditions according to IEC 62220-1-3 standards. We examined whether the image lag and MTF were influenced by the dose level and target movement speed. Indirect-conversion FPD showed dependence on the dose level, which was not observed for direct-conversion FPD. Furthermore, there were large differences in MTF between im ages of static and moving plate with indirect-conversion FPD in comparison to the differences observed with direct-conversion FPD. These results will be useful for the determination of imaging conditions for target tracking and other types of dynamic imaging.