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Sparsity-Based Thresholding Criterion for Spurious Echo Removal and Denoising Magnetic Resonance Spectra Using Rational-Dilation Wavelet Transform
Abstract
Biological signals such as magnetic resonance spectroscopy (MRS) signals are susceptible to noise and artifacts. The information obtained from these signals is significant in analyzing human physiological conditions. MRS, a non-ionizing and non-invasive method, presents an effective alternative method to biopsy for diagnosis and analysis from generated signals that are rich in chemical information of the tissues in the region of interest. A persisting problem of this method is the presence of noise and artifacts causing misinterpretation and subsequent incorrect diagnosis. The present research proposes a denoising strategy using the rational-dilation wavelet transform-based signal decomposition and a thresholding criterion designed using the Lpq norm-based sparsity measure of the decomposition levels of the signal. Compared with the standard state-of-the-art methods, which are effective in denoising but can cause distortion of the signal at discontinuities, the proposed method can remove artifacts such as spurious echoes present in the magnetic resonance signals and improve the signal-to-noise ratio without distorting the signal.
Supporting agencies: This work is supported by the Indian Institute of Technology (BHU), Varanasi, UP, India.
About the Authors
Ch. Sagar
School of Biomedical Engineering at Indian Institute of Technology (BHU)
India
India
Varanasi, Uttar Pradesh
D. Kumar Singh
Department of Oncology, Apex Super-Speciality Hospital and Post Graduate Institute
India
India
Varanasi, Uttar Pradesh
N. Sharma
School of Biomedical Engineering at Indian Institute of Technology (BHU)
India
India
Varanasi, Uttar Pradesh
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Review
For citations:
Sagar Ch., Kumar Singh D., Sharma N. Sparsity-Based Thresholding Criterion for Spurious Echo Removal and Denoising Magnetic Resonance Spectra Using Rational-Dilation Wavelet Transform. Zhurnal Prikladnoii Spektroskopii. 2022;89(3):430.
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