Improvement of image quality in CR mammography by detection of emissions from dual sides of an imaging plate
Improvement of image quality in CR mammography by detection of emissions from dual sides of an imaging plate
复制标题
通过检测成像板两侧的发射来提高 CR 乳腺 X 线摄影的图像质量
DOI：
10.1117/12.384536
复制
发表时间：
2000
期刊：
影响因子：
--
通讯作者：
Toshiaki Suzuki
中科院分区：
文献类型：
--
作者：
S. Arakawa;Hiroaki Yasuda;K. Kohda;Toshiaki Suzuki
我们开发了一种高分辨率成像板（IP），具有透明支架和阅读系统，可以检测IP两侧的发射，以提高CR乳腺X射线摄影的图像质量。提出了一种在真实的空间中进行滤波处理的加法方法，以实现在所有空间频率上的最佳加法。用NEQ和CD- MAM体模评价系统的图像质量.此外，我们分离的噪声分量，包括X射线光子噪声，光光子噪声，和结构噪声的IP利用激光功率依赖性的发射量和维纳谱。通过使用上述阅读系统和添加方法，系统的NEQ比最新CR乳腺X射线摄影系统提高了40% - 50%。通过使用CD-MAM，我们证实了在该阅读系统中图像的可检测性显著提高。噪声分析表明，前侧图像和后侧图像的1c/mm处的光光子噪声的比率分别为约15%和40%，并且随着空间频率变高，光光子噪声的比率增加。
We developed a high resolution Imaging Plate (IP) with a transparent support and a reading system that can detect emissions from dual sides of the IP to improve the image quality of the CR mammography. And we proposed an addition method using the filtering processing in real space in order to achieve optimum addition in all the spatial frequencies. The image quality of the system was evaluated by NEQ and CD- MAM phantom. Furthermore we separated the noise component that consisted of X-ray photon noise, light photon noise, and the structural noise of the IP utilizing laser power dependency of the amount of emissions and the Wiener Spectrum. By using the above reading system and the addition method, NEQ of the system was improved by 40% - 50% compared to the latest CR mammography system. We confirmed by use of CD-MAM that the detectability of the image in this reading system was remarkably improved. The noise analysis showed that the ratios of the light photon noise at 1c/mm of the front side image and the back side image were about 15% and 40%, respectively, and according as the spatial frequency became higher the ratio of the light photon noise increased.