Investigation of basic imaging properties in digital radiography. 4. Effect of unsharp masking on the detectability of simple patterns.
Investigation of basic imaging properties in digital radiography. 4. Effect of unsharp masking on the detectability of simple patterns.
复制标题
数字放射线摄影中基本成像特性的研究。
DOI：
10.1118/1.595775
复制
发表时间：
1985
期刊：
影响因子：
3.8
通讯作者：
Metz,CE
中科院分区：
文献类型：
--
作者：
Loo,LN;Doi,K;Metz,CE
通过非锐化掩蔽技术处理的简单放射学模式的信噪比（SNR）是基于统计决策理论模型计算的，该模型包括观察者的视觉传递函数和他的眼脑系统内部的噪声分量。对于各种处理参数，从该SNR预测的对比度-细节图与观察者性能研究中获得的实验结果定性一致。使用大掩模和大加权因子的反锐化掩模将方形物体的检测提高到与使用因子4的整体对比度增强技术所实现的水平相当的水平。然而，使用小掩模和大加权因子的反锐化掩模可以显著降低这些对象的可检测性。讨论了反锐化掩蔽技术的潜在实用性。
The signal‐to‐noise ratios (SNRs) of simple radiologic patterns processed by the unsharp‐masking technique were calculated on the basis of a statistical decision theory model that includes both the observer's visual transfer function and a noise component internal to his eye–brain system. For a variety of processing parameters, the contrast‐detail diagrams predicted from this SNR agreed qualitatively with experimental results obtained in observer performance studies. Unsharp masking with a large mask and a large weighting factor improved the detection of square objects to a level comparable with that achieved by the overall contrast enhancement technique using a factor of 4. However, unsharp masking with a small mask and a large weighting factor can substantially degrade the detectability of these objects. The potential practical utility of the unsharp‐masking technique is discussed.