An approach for automatic construction of the wavelet-domain de-noising procedure for THz pulsed spectroscopy signal processing

Zaytsev, Kirill I.; Chernomyrdin, Nikita V.; Gorevoy, Alexey V.; Trofimov, N. E.; Fokina, Irina N.; Alekhnovich, V. I.; Karasik, Valeriy E.; Yurchenko, Stanislav O.

doi:10.1088/1742-6596/486/1/012034

Cited by 7 publications

(5 citation statements)

References 8 publications

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“…Wavelet-domain denoising is based on the decomposition of the waveform using the particular wavelet basis and suppression of the decomposition coefficients that are below the defined threshold [213][214][215][216][217][218]. Selection of the optimal wavelet basis and threshold is rather challenging.…”

Section: Data Processing In Terahertz Pulsed Spectroscopymentioning

confidence: 99%

The progress and perspectives of terahertz technology for diagnosis of neoplasms: a review

Zaytsev

Dolganova

Chernomyrdin

et al. 2019

J. Opt.

165

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Over the past few decades, significant attention has been paid to the biomedical applications of terahertz (THz) technology. Nowadays, THz spectroscopy and imaging have allowed numerous demanding problems in the biological, medical, food, plant and pharmaceutical sciences to be solved. Among the biomedical applications, the label-free diagnosis of malignant and benign neoplasms represents one of the most attractive branches of THz technology. Despite this attractiveness, THz diagnosis methods are still far from being ready for use in medical practice. In this review, we consider modern research results in the THz diagnosis of malignant and benign neoplasms, along with the topical research and engineering problems which restrain the translation of THz technology to clinics. We start by analyzing the common models of THz-wave-tissue interactions and the effects of tissue exposure to THz waves. Then, we discuss the existing modalities of THz spectroscopic and imaging systems, which have either already been applied in medical imaging, or hold strong potential. We summarize the earlier-reported and original results of the THz measurements of neoplasms with different nosology and localization. We pay attention to the origin of contrast between healthy and pathological tissues in the THz spectra and images, and discuss the prospects of THz technology in

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Section: Data Processing In Terahertz Pulsed Spectroscopymentioning

confidence: 99%

The progress and perspectives of terahertz technology for diagnosis of neoplasms: a review

Zaytsev

Dolganova

Chernomyrdin

et al. 2019

J. Opt.

165

View full text Add to dashboard Cite

show abstract

“…Under the assumption of Gaussian noise, the threshold (

) is selected dynamically, and the heursure [ 16 ] threshold can minimize Stein’s unbiased risk estimator [ 16 , 17 , 18 ]. The heursure threshold integrates two threshold methods including the sqtwolog threshold [ 18 ] and the rigrsure threshold [ 23 ]. The sqtwolog threshold is a simple method that uses a fixed threshold to deal with the detail coefficients at the first two levels of which the signal-to-noise ratio is low.…”

Section: Data Extractionmentioning

confidence: 99%

“…To address this problem, RDTrack extracts accurate phase values from the raw signal and leverages phase changes to calculate the Doppler shifts. Based on the Discrete Wavelet Transform (DWT) [ 13 , 14 , 15 ], we use the heursure [ 16 , 17 , 18 ] threshold method to remove the noisy part from the raw phase values. Figure 2 demonstrates that Doppler shifts that we calculate from the phase values are more accurate to measure human motion.…”

Section: Introductionmentioning

confidence: 99%

Accurate Device-Free Tracking Using Inexpensive RFIDs

Guo

Yang

et al. 2018

Sensors

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Without requiring targets to carry any device, device-free-based tracking is playing an important role in many emerging applications such as smart homes, fitness tracking, intruder detection, etc. While promising, current device-free tracking systems based on inexpensive commercial devices perform well in the training environment, but poorly in other environments because of different multipath reflections. This paper introduces RDTrack, a system that leverages changes in Doppler shifts, which are not sensitive to multipath, to accurately track the target. Moreover, RDTrack identifies particular patterns for fine-grained motions such as turning, walking straightly, etc., which can achieve accurate tracking. For the purpose of achieving a fine-grained device-free tracking system, this paper builds a trajectory estimating model using HMM (Hidden Markov Model) to improve the matching accuracy and reduce the time complexity. We address several challenges including estimating the tag influenced time period, identifying moving path and reducing false positives due to multipath. We implement RDTrack with inexpensive commercial off-the-shelf RFID (Radio Frequency IDentification) hardware and extensively evaluate RDTrack in a lobby, staircase and library. Our results show that RDTrack is effective in tracking the moving target, with a low tracking error of 32 cm. This accuracy is robust for different environments, highlighting RDTrack’s ability to enable future essential device-free moving-based interaction with RFID devices.

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“…Moreover, as we all have involved in the scientific work at the University, we prepared lectures about our own research projects, concerning 3D-vision, 2 medical application of optical devices, 3-5 photonic crystals, 6-8 spectroscopy and its applications in various cases, [9][10][11][12][13][14] and fiber optics. For all of these seminars were explained the main results of the different studies.…”

Section: Activitiesmentioning

confidence: 99%

Summer school in Kabardino-Balkaria by BMSTU SPIE Student Chapter

et al. 2014

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This summer BMSTU SPIE Student Chapter have decided to visit Kabardino-Balkaria Republic of Caucasus (Russia) and spent there a week with children in a camp. It was called Summer School. We decided to organize it in order to engage talented and curious children in optics and photonics, and to show them how science could be for fun. Education and entertainment program included such activities as lectures, optical demonstrations, laser games, hiking in the forest, and others. As a result children had a good time outdoors, learned interesting facts and about optics and lasers, and of course found new friends who are keen to know more too. Four Chapter members and about 70 children of age 10-16 took part in this event.

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An approach for automatic construction of the wavelet-domain de-noising procedure for THz pulsed spectroscopy signal processing

Cited by 7 publications

References 8 publications

The progress and perspectives of terahertz technology for diagnosis of neoplasms: a review

The progress and perspectives of terahertz technology for diagnosis of neoplasms: a review

Accurate Device-Free Tracking Using Inexpensive RFIDs

Summer school in Kabardino-Balkaria by BMSTU SPIE Student Chapter

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