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Near-IR absorption spectrum of dichloromethane showing complicated overlapping overtones of mid IR absorption features.. Near-infrared spectroscopy (NIRS) is a spectroscopic method that uses the near-infrared region of the electromagnetic spectrum (from 780 nm to 2500 nm). [1]
In addition to the total concentration of hemoglobin, the oxygen saturation will define the concentration of oxy- and deoxyhemoglobin in tissue and so the total absorption spectrum. Depending on the type of tissue, we can consider different situations. Below, the total concentration of hemoglobin is assumed to be 2.3 mM.
Diffuse optical imaging (DOI) is a method of imaging using near-infrared spectroscopy (NIRS) [1] or fluorescence-based methods. [2] When used to create 3D volumetric models of the imaged material DOI is referred to as diffuse optical tomography, whereas 2D imaging methods are classified as diffuse optical imaging.
Near-infrared spectroscopy, a spectroscopic method that uses the near-infrared region (from 780 nm to 2500 nm). National Identity Register, a former UK database; National Internet registry, which coordinates IP address and other resource allocation; NIR, proposed variation of the SECAM colour television system in the Soviet Union
The Journal of Near Infrared Spectroscopy is a bimonthly peer-reviewed scientific journal published by SAGE Publishing in partnership with Optica. It was established in 1993 and covers near-infrared spectroscopy and its applications, with subtopics including chemometrics , chemical imaging , fiber optics , instrumentation and diffuse reflection .
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Functional near-infrared spectroscopy (fNIRS) is an optical brain monitoring technique which uses near-infrared spectroscopy for the purpose of functional neuroimaging. [1] Using fNIRS, brain activity is measured by using near-infrared light to estimate cortical hemodynamic activity which occur in response to neural activity.
In 1966, in a book entitled Reflectance Spectroscopy, Harry Hecht had pointed out that the formulation = led to = , which enabled plotting "against the wavelength or wave-number for a particular sample" giving a curve corresponding "to the real absorption determined by transmission measurements, except for a displacement by in ...