Cited by 109Terahertz technology and applicationsOptical Imaging and Spectroscopy TechniquesSpectroscopy Techniques in Biomedical and Chemical Research

Development of a compact terahertz time-domain spectrometer for the measurement of the optical properties of biological tissues

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Wilmink, Gerald J., Ibey, Bennett L., Rivest, Benjamin D., Grundt, Jessica E., Roach, William P., Tongue, Thomas D., Schulkin, Brian J., Laman, Norman +3 more·2011·Journal of Biomedical Optics

Abstract

Terahertz spectrometers and imaging systems are currently being evaluated as biomedical tools for skin burn assessment. These systems show promise, but due to their size and weight, they have restricted portability, and are impractical for military and battlefield settings where space is limited. In this study, we developed and tested the performance of a compact, light, and portable THz time-domain spectroscopy (THz-TDS) device. Optical properties were collected with this system from 0.1 to 1.6 THz for water, ethanol, and several ex vivo porcine tissues (muscle, adipose, skin). For all samples tested, we found that the index of refraction (n) decreases with frequency, while the absorption coefficient (μa) increases with frequency. Muscle, adipose, and frozen/thawed skin samples exhibited comparable n values ranging between 2.5 and 2.0, whereas the n values for freshly harvested skin were roughly 40% lower. Additionally, we found that the freshly harvested samples exhibited higher μa values than the frozen/thawed skin samples. Overall, for all liquids and tissues tested, we found that our system measured optical property values that were consistent with those reported in the literature. These results suggest that our compact THz spectrometer performed comparable to its larger counterparts, and therefore may be a useful and practical tool for skin health assessment.

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  • Conventional terahertz TDS systems with delay lengths of several 100 picoseconds achieve measurement speeds of only a few to a few hundred pulse traces per second, falling short of high-speed monitoring requirements.

    “For a delay length of several 100 picoseconds, the measurement speed of conventional systems ranges from a few to few 100 terahertz pulse traces per second [15][16][17], and thus falls short of the requirements for high-speed monitoring.”

    From Fastest Thickness Measurements with a Terahertz Time-Domain System Based on Electronically Controlled Optical Sampling (2019) · cites this paper as [16]

    Section 2.4 (page unavailable) reports that the paper’s compact THz-TDS system acquired waveforms at 5 Hz, supporting the low-speed end of the cited range. It does not establish that conventional systems with delays of several hundred picoseconds span a few to a few hundred traces per second, or assess high-speed monitoring requirements. (LLM, conf=0.78)

    Experimental — accuracy not yet measured

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Authors
Wilmink, G. J., Ibey, B. L., Rivest, B. D., Grundt, J. E., Roach, W. P., Tongue, T. D., Schulkin, B. J., Laman, N., Peralta, X. G., Roth, C. C., & Cerna, C. Z.
Affiliations
  • United States Air Force Research Laboratory (US)
  • United States Air Force (US)
  • Zomega Terahertz (United States) (US)
  • General Dynamics (United States) (US)
Venue
Journal of Biomedical Optics
Published
2011-04-01
Volume
16
Issue
04
Pages
1-11
ISSN
  • 1083-3668 (ISSN-L)
  • 1560-2281
OpenAlex
W2095758757
Cited by
109
References
72
Citations by year
2026: 1 · 2025: 6 · 2024: 7 · 2023: 16 · 2022: 12 · 2021: 7 · 2020: 11 · 2019: 5 · 2018: 9 · 2017: 3 · 2016: 9 · 2015: 5 · 2014: 2 · 2013: 8 · 2012: 6
FWCI
4.03
Type
journal article
Language
en
Open access
Locations
  • Journal of Biomedical Optics (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Science Foundation (0934218)
Topics
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Terahertz technology and applications
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Optical Imaging and Spectroscopy Techniques
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biophysics › Spectroscopy Techniques in Biomedical and Chemical Research
Keywords
terahertz time-domain spectroscopy, compact spectrometer, portable instrumentation, tissue optical properties, refractive index, absorption coefficient, porcine skin, porcine muscle, porcine adipose tissue, tissue hydration
MeSH terms
Adipose Tissue, Ethanol, Animals, Diagnostic Imaging, Humans, Muscles, Refractometry, Skin, Swine, Water, Terahertz Spectroscopy

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