射波刀VSI系统非晶硅平板数字探测器的影像质量研究-《中国医学物理学杂志》

文章信息/Info

Title:: Evaluation of the quality of images obtained using amorphous silicon flat-panel digital detectors in CyberKnife VSI system

作者:: 祝小惠1; 梁志文1; 杜金林2; 李晓东2; 龙浩2; 杨晶1; 1.华中科技大学同济医学院附属协和医院肿瘤中心，湖北武汉430022； 2.中南民族大学电子信息工程学院，湖北武汉 430074

Author(s):: ZHU Xiaohui1; LIANG Zhiwen1; DU Jinlin2; LI Xiaodong2; LONG Hao2; YANG Jing1; 1. Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China 2. School of Electronic and Information Engineering, South-Central University for Nationalities, Wuhan 430074, China

Keywords:: Keywords: amorphous silicon flat-panel digital detector CyberKnife VSI QCkV-1 phantom spatial resolution contrast-to-noise ratio

摘要:: 目的：基于QCkV-1模体结合PIPSpro软件评估分析射波刀VSI系统非晶硅平板数字探测器记录的影像质量。方法：将QCkV-1模体配合专用定位架按照预先制定的计划重复放置于射波刀成像子系统的影像中心位置，X射线管拍片后获取由非晶硅平板数字探测器（成像仪A和B）记录的两组影像，导入PIPSpro软件分析，指标包括空间分辨率（f30、f40、f50）和对比度噪声比。结果：在临床治疗的kV值范围内（100~125 kV），成像仪A的f30、f40、f50最大偏差为0.94%、1.67%、0.29%，成像仪B分别为0.81%、1.31%和1.42%。对于对比度噪声比，当小于115 kV时两成像仪随kV值变化平缓，大于115 kV时展现出明显分化。结论：QCkV-1模体结合PIPSpro软件能够便捷开展射波刀VSI系统非晶硅平板数字探测器成像质量的检测分析工作。

Abstract:: Abstract: Objective To evaluate and analyze the imaging quality of the amorphous silicon flat-panel digital detectors in CyberKnife VSI system using QCkV-1 phantom and PIPSpro software. Methods QCkV-1 phantom and the special positioning frame were repeatedly placed in the image center of CyberKnife imaging subsystem according to the pre-designed plans. After X-ray tube photography, two groups of images recorded by the amorphous silicon flat-panel digital detectors (cameras A and B) were acquired and imported into PIPSpro software for analysis. The analysis indicators included spatial resolution (f30, f40 and f50) and contrast-to-noise ratio. Results Within the range of kV values for clinical treatment (100-125 kV), the maximum deviations of f30, f40 and f50 for camera A were 0.94%, 1.67%, 0.29%, while those were 0.81%, 1.31% and 1.42% for camera B, respectively. The contrast-to-noise ratios of images obtained by two cameras changed gently with kV when the value was less than 115 kV and showed obvious differentiations when it was greater than 115 kV. Conclusion QCkV-1 phantom combined with PIPSpro software can be used to easily detect and analyze the imaging quality of the amorphous silicon flat-panel digital detectors in CyberKnife VSI system.