Investigation of basic imaging properties in digital radiography. 2. Noise Wiener spectrum.
Investigation of basic imaging properties in digital radiography. 2. Noise Wiener spectrum.
复制标题
数字放射线摄影中基本成像特性的研究。
DOI：
10.1118/1.595583
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发表时间：
1984
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：
Giger,ML;Doi,K;Metz,CE
从理论上研究了采样孔径、采样距离、量化级数和显示孔径等数字参数对数字射线成像系统噪声维纳谱的影响。我们还测量了我们的数字图像模拟/处理系统的维纳光谱，结果与理论预测吻合得很好。混叠是由欠采样引起的伪影，使用有限数量的量化水平可以增加数字系统的维纳谱。图像处理的影响，包括不锐利的掩模滤波，积分和减法，对维纳谱也进行了演示。由于噪声影响到放射物体的可探测性，从而影响诊断的准确性，因此了解各种数字参数对噪声谱的影响将有助于未来数字成像系统的评估和设计。
We investigated theoretically the effects of various digital parameters, such as sampling aperture, sampling distance, number of quantization levels, and display aperture, on the noise Wiener spectrum of digital radiographic imaging systems. We also measured Wiener spectra for our digital image simulation/processing system, and the results agreed well with the theoretical predictions. Aliasing, which is an artifact caused by undersampling, and the use of a limited number of quantization levels were found to increase the Wiener spectrum for digital systems. The effects of image processing, including unsharp mask filtering, integration, and subtraction, on the Wiener spectrum were also demonstrated. Since noise influences the detectability of radiologic objects and thus diagnostic accuracy, knowledge of the effects of the various digital parameters on the noise spectrum will be useful in the evaluation and design of future digital imaging systems.