Regional improvement of signal-to-noise and contrast-to-noise ratios in dual-screen CR chest imaging--a phantom study.
Regional improvement of signal-to-noise and contrast-to-noise ratios in dual-screen CR chest imaging--a phantom study.
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双屏 CR 胸部成像中信噪比和对比度噪声比的区域改善——一项模型研究。
DOI：
10.1118/1.1376136
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发表时间：
2001
期刊：
影响因子：
3.8
通讯作者：
Shaw,CC
中科院分区：
文献类型：
--
作者：
Liu,X;Shaw,CC
针对拟人胸部体模图像中的各个区域，研究了双屏计算机X射线摄影（CR）中信噪比（SNR）和对比噪声比（CNR）的改善。使用双屏CR技术时，将两个图像板放置在一个暗盒中，并在成像过程中一起曝光。分别扫描曝光的板以形成前图像和后图像，然后将前图像和后图像配准并叠加以形成具有改善的SNR和CNR的合成图像。可以通过在叠加期间应用特别选择的加权因子来优化改进。在本研究中，使用标准分辨率（ST）和高分辨率（HR）屏幕的四种不同组合采集并形成了拟人胸部体模的双屏CR图像：ST-ST、ST-HR、HR-ST和HR-HR。在这些图像中的12个代表性感兴趣区域（ROI）上测量并比较SNR及其改善。根据所使用的ROI和屏幕组合，观察到SNR增加19.1%-45.7%。最佳加权因子的变化范围仅为4.5%-12.4%。所有筛选组合的肺野改善最大。以肋骨为对比对象，在肺野的两个ROI上观察CNR的改善，观察到CNR改善29.2%-43.9%。在四种筛选组合中，ST-ST导致SNR和CNR改善最多，其次是HR-ST、HR-HR和ST-HR。HR-ST组合产生了最佳加权因子的最低空间变化，其改善的SNR和CNR接近ST-ST组合的SNR和CNR。
The improvement of signal‐to‐noise ratio (SNR) and contrast‐to‐noise ratio (CNR) in dual‐screen computed radiography (CR) has been investigated for various regions in images of an anthropomorphic chest phantom. With the dual‐screen CR technique, two image plates are placed in a cassette and exposed together during imaging. The exposed plates are separately scanned to form a front image and a back image, which are then registered and superimposed to form a composite image with improved SNRs and CNRs. The improvement can be optimized by applying specifically selected weighting factors during superimposition. In this study, dual‐screen CR images of an anthropomorphic chest phantom were acquired and formed with four different combinations of standard resolution (ST) and high‐resolution (HR) screens: ST–ST, ST–HR, HR–ST, and HR–HR. SNRs and their improvements were measured and compared over twelve representative regions‐of‐interest (ROIs) in these images. A 19.1%–45.7% increase of the SNR was observed, depending on the ROI and screen combination used. The optimal weighting factors were found to vary by only 4.5%–12.4%. Largest improvement was found in the lung field for all screen combinations. Improvement of CNRs was investigated over two ROIs in the lung field using the rib bones as the contrast objects and a 29.2%–43.9% improvement of the CNR was observed. Among the four screen combinations, ST–ST resulted in the most SNR and CNR improvement, followed in order by HR–ST, HR–HR, and ST–HR. The HR–ST combination yielded the lowest spatial variation of the optimal weighting factors with improved SNRs and CNRs close to those of the ST–ST combination.
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双屏计算机放射成像 (CR) 成像中的区域 SNR 优化
影响因子：
6.7
作者：
C. Shaw;D. S. Breitenstein
通讯作者：
D. S. Breitenstein
存储荧光成像中的信号衰落、擦除和重新扫描
DOI：
10.1117/12.59393
发表时间：
1992
期刊：
The Journal of general and applied microbiology
影响因子：
--
作者：
C. Shaw;J. Herron;D. Gur
通讯作者：
D. Gur
原型扫描槽数字乳腺X线摄影系统的成像性能
DOI：
10.1117/12.154579
发表时间：
1993
期刊：
The Journal of general and applied microbiology
影响因子：
--
作者：
Andrew D. A. Maidment;M. Yaffe;D. Plewes;G. Mawdsley;I. Soutar;B. Starkoski
通讯作者：
B. Starkoski
利用计算机放射线照相技术进行传统乳房X线照相术和数字乳房X线照相术之间的临床比较。
DOI：
10.1259/0007-1285-67-797-464
发表时间：
1994
期刊：
The British journal of radiology
影响因子：
--
作者：
D. Brettle;S C Ward;G. Parkin;A. Cowen;H J Sumsion
通讯作者：
H J Sumsion
影响因子：
3.8
作者：
Vedantham, S;Karellas, A;Hendrick, RE
通讯作者：
Hendrick, RE