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首页> 外文期刊>IEEE Transactions on Medical Imaging >Nonstationary filtering of transmission tomograms in high photon counting noise
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Nonstationary filtering of transmission tomograms in high photon counting noise

机译：高光子计数噪声中传输断层图的非平稳滤波

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摘要

The algorithm presented here for nonstationary constrained least-squares filtering deals with the transmission photon counting noise problem in the presence of limited dosages and highly nonhomogeneous fields. This technique consists of a design for a set of nonstationary filters, tuned to local noise autocorrelation functions in the reconstructed image. Estimates of noise properties can be taken from object detection information. The approach yields improvement in the tradeoff between noise levels and resolution of the image by exchanging artifacts for less colored noise, which is more easily overcome by the viewer.
机译：这里介绍的用于非平稳约束最小二乘滤波的算法在有限剂量和高度非均匀场的情况下处理透射光子计数噪声问题。该技术由一组非平稳滤波器的设计组成，这些滤波器被调整到重构图像中的局部噪声自相关函数。可以从物体检测信息中获取噪声属性的估计值。该方法通过将伪像交换为较少的有色噪声来改善噪声水平和图像分辨率之间的权衡，这更容易被观看者克服。

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