Resolution Properties Of A Computed Radiographic System
Resolution Properties Of A Computed Radiographic System
复制标题
计算机射线照相系统的分辨率特性
DOI：
10.1117/12.953211
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
T. Fujikawa
中科院分区：
文献类型：
--
作者：
H. Fujita;J. Morishita;K. Ueda;D. Tsai;A. Ohtsuka;T. Fujikawa
根据调制传递函数 (MTF) 进行的空间分辨率特性分析已在带有光激励磷光板（成像板，IP）的计算机放射线照相（CR）系统（FCR-101）中进行了呈现。描述了新设计的确定预采样MTF的方法，该方法包括X射线探测器(IP)不清晰度和采样孔径的不清晰度，其中采用相对于水平或垂直方向稍微成角度的引导狭缝的图像。测量并显示了系统中作为模拟 MTF 的 IP MTF、不同类型 IP、不同采样距离、不同版本 IP、同时多断层摄影和放大射线照相的预采样 MTF，以及作为显示 MTF 的激光打印机 MTF。计算出的有效采样孔径MTF表明，分辨率的明显下降发生在图像数据采样阶段。证明了放大技术在乳房X线摄影和骨X线摄影中的有用性。结果表明，由于混叠伪影，数字 MTF 和整体 MTF 都难以用于通用目的。眩光对对比度的影响也可以通过铅盘法来表征。发现眩光分数约为 6.5%。
The analysis of spatial-resolution properties in terms of the modulation transfer function (MTF) has been presented in a computed radiographic (CR) system (FCR-101) with the photostimulable-phosphor plate (imaging plate, IP). The newly devised method of determining the presampling MTF which includes the x-ray detector (IP) unsharpness and the unsharpness of the sampling aperture is described in which an image of a slightly-angulated lead slit relative to a horizontal or vertical direction is employed. The IP MTFs as an analog MTF in the system, the presampling MTFs for different types of IPs, different sampling distances, different versions of IPs, simultaneous multisection tomography and magnification radiography, and the laser-printer MTFs as display MTF are measured and shown. The effective sampling aperture MTFs calculated indicate that the noticeable degradation of resolution occurs at the stage of image data sampling. The usefulness of the magnification technique for mammography and bone radiography is demonstrated. It is shown that both of the digital MTF and the overall MTF are difficult to use for general purpose due to the aliasing artifacts. The effect of glare on the contrast is also characterized by lead-disk method. The glare fraction is found to be approximately 6.5%.
数字放射线摄影中基本成像特性的研究。
影响因子：
3.8
作者：
Giger,ML;Doi,K;Metz,CE
通讯作者：
Metz,CE
利用铝阶梯楔技术精确测量 II-TV 数字系统的特性曲线。
影响因子：
3.8
作者：
Fujita,H;Doi,K
通讯作者：
Doi,K
数字放射线摄影中基本成像特性的研究。
影响因子：
3.8
作者：
Fujita,H;Doi,K;Giger,ML;Chan,HP
通讯作者：
Chan,HP