Nondestructive and Noninvasive Monitoring of Deoxyhemoglobin in the Vein by Use of a Near-Infrared Reflectance Spectrometer with a Fiber-Optic Probe

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Near-infrared reflectance (NIR) spectroscopy, which has become a widely used technique in food analysis, also holds considerable promise as a nondestructive and noninvasive probe for clinical diagnosis and examinations. Since the light in the near-infrared region is able to penetrate human tissues sufficiently, the use of the NIR technique may enable one to extract useful information directly from a human body without any pain and injury. However, in spite of the potentiality of NIR spectroscopy in medicine, its applications to clinical problems are still very limited; so far, most near-infrared spectroscopic studies in the medical field are concerned with the estimation of body fat and with the quantification of cerebral oxygenation and hemodynamics. Therefore, we have started working toward novel applications of the NIR method to medical problems. In this note we demonstrate the usefulness of NIR spectroscopy with fiber optics in the noninvasive monitoring of deoxyhemoglobin in the vein; it is possible to obtain in vivo NIR spectra of venous blood from various parts of the human body surface, with a high signal-to-noise ratio.

Keywords: Biomedical application; Blood analysis; Fiber optics; Near-infrared; Nondestructive analysis; Reflectance spectroscopy

Document Type: Short Communication


Affiliations: 1: Department of Chemistry, School of Science, Kwansei Gakuin University, Uegahara, Nishinomiya 662, Japan 2: Department of Pediatrics, The Jikei University School of Medicine, Nishi-Shinbashi, Minato-ku, Tokyo 105, Japan 3: Bran+Luebbe, Sendagaya, Shibuya-ku, Tokyo 151, Japan

Publication date: January 1, 1992

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