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Dual-energy technique for digital flat-panel detectors without x-ray tube voltage switching

机译:无需X射线管电压切换的数字平板探测器的双能技术

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Dual-energy imaging increases the possibility of pulmonary nodule detection by reducing the bone structure noise. The major problem of the dual-energy acquisition process with digital flat-panel detectors is the interval of time between low-energy (LE) exposure and high-energy (HE) exposure. Due to misregistration between LE and HE images, motion artifacts pollute the subtracted image. This paper presents a new acquisition approach for dual-energy imaging developed in order to reduce this inter-exposure time. The idea is to keep the tube voltage constant and to just switch a filter in front of the imaged object and thus to modulate the outgoing x-ray spectrum. The first part of this study presents how to optimize system parameters for the new acquisition protocol: source voltage, dynamic filtration before the patient, exposure time for LE and HE acquisition. The tube load is kept constant to focus the optimization study on the dose and the exposure time. A noise quality factor (NQF) and a spectral quality factor (SQF) are used as criteria for optimization. The new approach system is then compared to the state-of-the-art system with voltage switching between low and high energy. A filtering algorithm of dual energy acquisitions enabling a significant noise reduction is presented. Performance between its combination with the new acquisition protocol and the reference one are compared. For a limited noise quality factor, three times faster acquisition time is obtained using the new system. Noise reduction techniques improve the image SNR by 61% in the new system and only 32% in the reference system, without taking into account the impact of better registration on the dual-energy image quality.
机译:双能成像通过减少骨骼结构噪音,增加了肺结节检测的可能性。数字平板探测器的双能量采集过程的主要问题是低能量(LE)曝光和高能量(HE)曝光之间的时间间隔。由于LE和HE图像之间的配准错误,运动伪影会污染相减的图像。本文提出了一种新的双能量成像采集方法,以减少这种相互曝光时间。这个想法是保持管电压恒定,并且仅在成像对象的前面切换滤波器,从而调制输出的X射线光谱。本研究的第一部分介绍了如何针对新的采集方案优化系统参数:电源电压,患者之前的动态过滤,LE和HE采集的暴露时间。管负载保持恒定,以将优化研究的重点放在剂量和暴露时间上。噪声质量因子(NQF)和频谱质量因子(SQF)用作优化标准。然后,将新方法的系统与在低能量和高能量之间进行电压切换的最新系统进行比较。提出了一种双能量采集的滤波算法,可显着降低噪声。比较了其与新采集协议的组合与参考协议之间的性能。对于有限的噪声品质因数,使用新系统可获得快三倍的采集时间。在不考虑更好的配准对双能图像质量的影响的情况下,降噪技术在新系统中将图像SNR提高了61%,在参考系统中仅将图像SNR提高了32%。

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