Windowing of THz time-domain spectroscopy signals: A study based on lactose

Vázquez-Cabo, José; Chamorro‐Posada, Pedro; Fraile-Peláez, F.J.; Rubiños-López, Óscar; López-Santos, José María; Martín-Ramos, Pablo

doi:10.1016/j.optcom.2015.12.069

Cited by 37 publications

(18 citation statements)

References 15 publications

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“…As the differences between different types of window functions are negligible in frequencies below 1 THz, a Gaussian window was chosen. This window provided a moderate improvement for both spectral and dynamic ranges [20]. As a result, complex amplitudes for the reference signal and the sample signal were obtained.…”

Section: Discussionmentioning

confidence: 98%

Investigation of Fresh Gastric Normal and Cancer Tissues Using Terahertz Time-Domain Spectroscopy

et al. 2019

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In recent times, terahertz (THz) technologies have been actively applied in many biomedical research work, including gastric cancer diagnosis. In order to provide an effective removal of tumor during surgery, it is necessary to clearly distinguish it from different membranes of the stomach. In this work, we reported an investigation of various normal and cancer fresh gastric tissues using terahertz time-domain spectroscopy in the reflection mode. Refractive index and absorption coefficient of moderately differentiated and poorly differentiated gastric adenocarcinomas, as well as both serosa and mucosa were obtained in the frequency range from 0.2 to 1 THz. All cancer tissues were distinguishable from normal ones. The influence of the morphology of the investigated tissues on the obtained optical properties is discussed. The obtained results demonstrated a potential of THz time-domain spectroscopy to discriminate a tumor from normal serous and mucous gastric membranes. Thus, this method might be applied to gastric cancer diagnosis.

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Section: Discussionmentioning

confidence: 98%

Investigation of Fresh Gastric Normal and Cancer Tissues Using Terahertz Time-Domain Spectroscopy

et al. 2019

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“…The eggs were irradiated by a THz pulse with an incident angle of 13 degrees. Following this, the reflected time-domain signal from the egg was obtained and reflectance calculated using a Blackman-Harris window function 18 . We then performed a fast Fourier transformation (FFT).…”

Section: Methodsmentioning

confidence: 99%

A Nondestructive Eggshell Thickness Measurement Technique Using Terahertz Waves

Khaliduzzaman

Konagaya

Suzuki

et al. 2020

Sci Rep

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eggshells play a number of important roles in the avian and reptile kingdom: protection of internal contents and as a major source of minerals for developing embryos. However, when researching these respective roles, eggshell thickness measurement remains a bottleneck due to the lack of a non-destructive measurement techniques. As a result, many avian and reptile research protocols omit consideration of eggshell thickness bias on egg or embryo growth and development. Here, we validate a non-destructive method to estimate eggshell thickness based on terahertz (THz) reflectance spectroscopy using chicken white coloured eggs. Since terahertz waves are reflected from outer aireggshell interface, as well as the inner eggshell-membrane boundary, the resulting interference signals depend on eggshell thickness. Thus, it is possible to estimate shell thickness from the oscillation distance in frequency-domain. A linear regression-based prediction model for non-destructive eggshell thickness measurement was developed, which had a coefficient of determination (R 2) of 0.93, RMSEP of 0.009, RPD of 3.45 and RER 13.67. This model can estimate eggshell thickness to a resolution of less than 10 μm. This method has the potential to expand the protocols in the field of avian and reptile research, as well as be applied to industrial grading of eggs.

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“…Then the averaged waveforms were used to calculate the optical properties of the samples to diminish the system errors. The waveforms were first filtered using the Gaussian window to acquired correct phases [19]. After the filtration, the Fourier transform was done to extract information such as amplitude and phase.…”

Section: Investigation Methodsmentioning

confidence: 99%

Terahertz optical and mechanical properties of the gelatin-starch-glycerol-bentonite biopolymers

Zhang

Захарова

Vozianova

et al. 2020

J-BPE

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With the fast development of terahertz technology in medical diagnosis and monitoring, it has become important to investigate the application of THz radiation in the cancer treatment assessment during the therapy. In this paper, a buccal drug delivery system is studied as the first step towards this application. The drug delivery system is based on a gelatin-starch biopolymer matrix filled with plasticizing glycerol and various contents of reinforcing particles of bentonite clay. The biopolymers were subjected to morphology analysis using optical microscopy, analysis of mechanical tensile properties, and analysis of terahertz optical properties, followed by a theoretical approach of the experiment. The results show a visible effect of the bentonite content on both of the mechanical and terahertz optical properties of the biopolymer. These findings allow us to confirm the feasibility of using THz radiation for cancer assessment during therapies. The proposed biopolymer also has the potential to be applied as a substrate when carrying out in-vivo optical property measurement of biotissue in terahertz frequency range.

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Windowing of THz time-domain spectroscopy signals: A study based on lactose

Cited by 37 publications

References 15 publications

Investigation of Fresh Gastric Normal and Cancer Tissues Using Terahertz Time-Domain Spectroscopy

Investigation of Fresh Gastric Normal and Cancer Tissues Using Terahertz Time-Domain Spectroscopy

A Nondestructive Eggshell Thickness Measurement Technique Using Terahertz Waves

Terahertz optical and mechanical properties of the gelatin-starch-glycerol-bentonite biopolymers

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