Sized-fiber reflectometry for measuring local optical properties

Moffitt, Theodore P.; Prahl, Scott A.

doi:10.1109/2944.983299

Cited by 36 publications

(18 citation statements)

References 30 publications

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“…The theoretical framework for this analysis has already been developed in a nonimaging technique called single fiber reflectance spectroscopy (SFR) where reflectance measurements are carried out with singlefiber probes in direct contact with the sample. [36][37][38][39] These SFR models may be adapted for noncontact imaging with the DCFC setup to accurately determine the correction factors necessary to recover the reflectance as measured by a video camera. Furthermore, these models may be used to estimate both the optical and physiological properties of biological samples.…”

Section: Reflectance Measurementsmentioning

confidence: 99%

Coregistered optical coherence tomography and frequency-encoded multispectral imaging for spectrally sparse color imaging

et al. 2019

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Coregistered optical coherence tomography and frequency-encoded multispectral imaging for spectrally sparse color imaging," J.Abstract. We present a system combining optical coherence tomography (OCT) and multispectral imaging (MSI) for coregistered structural imaging and surface color imaging. We first describe and numerically validate an optimization model to guide the selection of the MSI wavelengths and their relative intensities. We then demonstrate the integration of this model into an all-fiber bench-top system. We implement frequency-domain multiplexing for the MSI to enable concurrent acquisition of both OCT and MSI at OCT acquisition rates. Such a system could be implemented in endoscopic practices to provide multimodal, high-resolution imaging of deep organ structures that are currently inaccessible to standard video endoscopes.

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Section: Reflectance Measurementsmentioning

confidence: 99%

Coregistered optical coherence tomography and frequency-encoded multispectral imaging for spectrally sparse color imaging

et al. 2019

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“…However, in laboratory environment they can provide a good reference when new measurement devices or methods are being tested or verified. Other methods that have been proposed for determination of absorption and scattering properties of turbid medium include photoacoustic techniques [22], spatially resolved diffuse reflectance [23]- [26], time-or frequency-domain reflectance [27], [28] and confocal microscopy [29]. In addition, optical coherence tomography, which is mainly used in 3-D imaging of biological tissue has been used to estimate scattering coefficient of weakly absorbing materials [30], [31].…”

Section: Introductionmentioning

confidence: 99%

Instrument for Measurement of Optical Parameters of Turbid Media by Using Diffuse Reflectance of Laser With Oblique Incidence Angle

Juttula

Kananen

Mäkynen

2014

IEEE Trans. Instrum. Meas.

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An instrument for simultaneous measurement of absorption and reduced scattering coefficients of optically turbid materials is presented. Determination of the coefficient is based on scattering profile of a laser beam illuminating the sample at oblique incidence angle. The back reflected profile is recorded by imaging the scattered laser spot on material surface, and the coefficients calculated by determining the asymmetry and the slope of the reflectance profile. Several calibrated phantoms having different combinations of absorption and reduced scattering coefficients were measured. Measurement ranges were from 0.0047 to 0.118 mm −1 for absorption and from 0.41 to 16.24 mm −1 Results given by our instrument were compared together with manufacturer's values against calibrated reference results. Acquired absorption and scattering properties were in most of the cases smaller than reference values and variations of the relative errors were small. Instrument was not observed to be sensitive to small spatial deviations of sample from ideal measurement geometry. 95% of the determined parameters were within 10% of the average values in repeatability experiments.

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“…Fiber-based probes have been widely used in biomedical spectroscopy and biomedical imaging, which provide an effective and flexible optical interface between the spectroscopic device and the samples to be measured [5][6][7]. The fibers have double roles in these systems: delivery of illumination to the target and collection and delivery of signal to the spectrometer or detector.…”

Section: Introductionmentioning

confidence: 99%

Optimization of fiber optic probe distance for biomedical spectroscopy

et al. 2010

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We present a theoretical model to maximize the illumination and collection efficiency in designing fiber optic probes for biomedical spectroscopy measurement. This model is in general applicable to probes with single or multiple fibers. We investigated a number of probe configurations and find that contact measurement is very inefficient for multi-fiber probes. Contact measurement is a good choice for single-fiber probes, but for multi-fiber probes, there is an optimal probe distance. By carefully choosing the probe and sample distance, the signal can be enhanced by 5-10 fold. Experiments demonstrate the distance dependence of collection efficiency in multi-fiber probes.

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Sized-fiber reflectometry for measuring local optical properties

Cited by 36 publications

References 30 publications

Coregistered optical coherence tomography and frequency-encoded multispectral imaging for spectrally sparse color imaging

Coregistered optical coherence tomography and frequency-encoded multispectral imaging for spectrally sparse color imaging

Instrument for Measurement of Optical Parameters of Turbid Media by Using Diffuse Reflectance of Laser With Oblique Incidence Angle

Optimization of fiber optic probe distance for biomedical spectroscopy

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