Ahmed Osama A
Hail Community College, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia.
IEEE Trans Med Imaging. 2005 Jun;24(6):809-16. doi: 10.1109/TMI.2004.828350.
A new scheme for denoising magnetic resonance spectroscopy (MRS) signals is presented. This scheme is based on projecting noisy MRS signals in different domains, consecutively, and performing noise filtering operations in these domains. The domains are chosen such that the noise portion, which is inseparable from the desired signal in one domain, is separable in the other. A set of stable, linear, time-frequency (SLTF) transforms with different resolutions was selected for these projections as an example. Scheme evaluation was performed using extensive MRS signals with various noise levels. Compared with one domain denoising, it was observed that the proposed scheme gives superior results that compensate for the excess computational requirements. The proposed scheme supersedes also the wavelet packet denoising schemes.
提出了一种用于磁共振波谱（MRS）信号去噪的新方案。该方案基于依次在不同域中对有噪声的MRS信号进行投影，并在这些域中执行噪声滤波操作。所选择的域使得在一个域中与期望信号不可分离的噪声部分在另一个域中是可分离的。作为示例，为这些投影选择了一组具有不同分辨率的稳定线性时频（SLTF）变换。使用具有各种噪声水平的大量MRS信号进行方案评估。与单域去噪相比，观察到所提出的方案给出了更好的结果，尽管其计算需求较高。所提出的方案也取代了小波包去噪方案。
