Investigation of basic imaging properties in digital radiography. 7. Noise Wiener spectra of II-TV digital imaging systems.
Investigation of basic imaging properties in digital radiography. 7. Noise Wiener spectra of II-TV digital imaging systems.
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数字放射线摄影中基本成像特性的研究。
DOI：
10.1118/1.595937
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发表时间：
1986
期刊：
影响因子：
3.8
通讯作者：
Fujita,H
中科院分区：
文献类型：
--
作者：
Giger,ML;Doi,K;Fujita,H
我们使用维纳频谱分析，以调查不同的噪声源和各种参数，如像素大小，图像增强器（II）的字段大小，和曝光水平上的噪声在II-TV数字系统的影响。通过使用成像系统的特征曲线，直接根据像素值的数字噪声数据确定相对X射线强度的数字维纳谱。从平均、减影和/或组合图像，估计相对于量子斑点的量的结构斑点的量。我们发现，大量的结构斑驳被包括在我们的II-TV数字减影血管造影系统，而电视系统的电子噪声是相当小的量子和结构斑驳。还研究了时间抖动对单帧图像（由多个视频帧组成）以及减影和平均图像中噪声的影响。
We used Wiener spectral analysis in order to investigate the different noise sources and the effects of various parameters such as pixel size, image intensifier (II) field size, and exposure level on the noise in an II–TV digital system. The digital Wiener spectra in terms of relative x‐ray intensity were determined directly from the digital noise data in terms of pixel values, by use of the characteristic curve of the imaging system. From averaged, subtracted, and/or combination images, the amount of structure mottle relative to the amount of quantum mottle was estimated. We found that a substantial amount of structure mottle was included in our II–TV digital subtraction angiography system, whereas the electronic noise of the TV system was quite small relative to the quantum and structure mottle. The effects of time jitter on the noise in single‐frame images (consisting of multiple video frames) and in subtracted and averaged images were also investigated.