Novel computed radiography system with improved image quality by detection of emissions from both sides of an imaging plate
Novel computed radiography system with improved image quality by detection of emissions from both sides of an imaging plate
复制标题
新颖的计算机放射成像系统通过检测成像板两侧的发射来提高图像质量
DOI：
10.1117/12.349535
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发表时间：
1999
影响因子：
13.1
通讯作者：
Toshiaki Suzuki
中科院分区：
文献类型：
--
作者：
S. Arakawa;Wataru Itoh;K. Kohda;Toshiaki Suzuki
本文介绍一种采用双面阅读方法和透明支撑成像板（IP）进一步提高CR图像质量的方法。在X射线成像系统中，决定图像质量的最重要因素是X射线利用效率。因此，我们提出了一种成像板，其由透明支撑体和较厚的光激励荧光体层组成，以及一种阅读方法，其允许检测来自IP两侧的发射，使得可以通过添加从IP两侧导出的图像数据来实现图像质量的改善。我们还发现，最佳的添加比例是依赖于空间频率，并提出了一种基于空间滤波器的添加处理方法，以实现在整个空间频率上的最佳添加。与单面阅读方法相比，基于所提出的阅读方法和添加方法的系统提供了30 - 40%的检测量子效率（DQE）的增加。此外，已经证实，相加图像的DQE取决于从成像板的两侧检测到的两个图像的数据之间的相关性。本文中提出的阅读方法可以提供增加的DQE，从而可以预期诊断性能的增强。
This paper describes an approach to further improving the image quality of computed radiography (CR) by use of a both- side reading method and an Imaging Plate (IP) with a transparent support. The most important factor for determining the image quality in an X-ray imaging system is X-ray utilization efficiency. Accordingly, we have proposed an imaging plate that consists of a transparent support and a thicker photostimulable phosphor layer, and a reading method that permits detection of emissions from both sides of the IP, so that an improvement in image quality can be achieved by adding image data derived from both sides of the IP. We have also found that the optimal addition ratio is dependent upon spatial frequency, and proposed a spatial filter-based addition process method for achieving optimal addition over the entire spatial frequency. The system based on the proposed reading method and addition method provided 30 - 40 % increase in detective quantum efficiency (DQE), as compared to single- side reading method. Furthermore, it has been confirmed that the DQE of the addition image is dependent upon the correlation between the data of the two images detected from both sides of the imaging plate. The reading method proposed in this paper can provide increased DQE, so that enhancement in diagnostic performance can be anticipated.