Dr. Niloy Choudhury Profile

Dr. Niloy Choudhury

Assistant Professor at Michigan Technological Univ

SPIE Involvement:

Author

Publications (31)

Proceedings Article | 8 March 2013 Paper

Measurement of in vivo basal-turn vibrations of the organ of Corti using phase-sensitive Fourier domain optical coherence tomography

Sripriya Ramamoorthy, Yuan Zhang, Tracy Petrie, Fangyi Chen, Hrebesh Subhash, Niloy Choudhury, Ruikang Wang, Steven Jacques, Alfred Nuttall

Proceedings Volume 8565, 85651V (2013) https://doi.org/10.1117/12.2009260

KEYWORDS: Optical coherence tomography, Cameras, Scanning probe lithography, In vivo imaging, Ear, Reflectivity, Tissues, Signal to noise ratio, Data acquisition, Mirrors

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SPIE Journal Paper | 1 March 2013 Open Access

Depth-resolved dual-beamlet vibrometry based on Fourier domain low coherence interferometry

Hrebesh Subhash, Niloy Choudhury, Fangyi Chen, Ruikang Wang, Steven Jacques, Alfred Nuttall

JBO, Vol. 18, Issue 03, 036003, (March 2013) https://doi.org/10.1117/12.10.1117/1.JBO.18.3.036003

KEYWORDS: Optical coherence tomography, Vibrometry, Interferometry, Imaging systems, Tissue optics, Glasses, Doppler effect, Acoustics, Laser Doppler velocimetry, Calibration

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SPIE Journal Paper | 6 June 2012 Open Access

Feasibility of spectral-domain phase-sensitive optical coherence tomography for middle ear vibrometry

Hrebesh Subhash, Steven Jacques, Anh Nguyen-Huynh, Alfred Nuttall, Ruikang Wang, Niloy Choudhury

JBO, Vol. 17, Issue 6, 060505, (June 2012) https://doi.org/10.1117/12.10.1117/1.JBO.17.6.060505

KEYWORDS: Optical coherence tomography, Ear, Bone, Vibrometry, Acoustics, Imaging systems, Fourier transforms, Phase measurement, Phase shift keying, Biomedical engineering

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Proceedings Article | 18 February 2012 Paper

Absolute measurement of subnanometer scale vibration of cochlear partition of an excised guinea pig cochlea using spectral-domain phase-sensitive optical coherence tomography

Hrebesh Subhash, Niloy Choudhury, Steven Jacques, Ruikang Wang, Fangyi Chen, Dingjun Zha, Alfred Nuttall

Proceedings Volume 8213, 82131V (2012) https://doi.org/10.1117/12.907900

KEYWORDS: Optical coherence tomography, Objectives, Signal to noise ratio, Fourier transforms, Mechanics, Vibrometry, Biomedical optics, Mirrors, Glasses, Imaging systems

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Proceedings Article | 9 February 2012 Paper

Evaluation of port-wine stain treatment outcomes using multispectral imaging

Ravikant Samatham, Niloy Choudhury, Alfons Krol, Steven Jacques

Proceedings Volume 8207, 82070C (2012) https://doi.org/10.1117/12.909509

KEYWORDS: Skin, Oxygen, Blood, Laser therapeutics, Imaging systems, Reflectivity, Dye lasers, Cameras, Tissue optics, Capillaries

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Proceedings Article | 9 February 2012 Paper

In vivo measurement of differential motion inside the organ of Corti using a low coherence interferometer system

Fangyi Chen, Dingjun Zha, Anders Fridberger, Jiefu Zheng, Niloy Choudhury, Steven Jacques, Ruikang Wang, Alfred Nuttall

Proceedings Volume 8207, 820726 (2012) https://doi.org/10.1117/12.908933

KEYWORDS: In vivo imaging, Motion measurement, Natural surfaces, Interferometers, Lead, Interferometry, Scanning probe lithography, Biomedical engineering, Optical amplifiers, In vitro testing

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Proceedings Article | 9 February 2012 Paper

Attenuation fluctuations and local dermal reflectivity are indicators of immune cell infiltrate and epidermal hyperplasia in skin inflammation

Kevin Phillips, Yun Wang, Niloy Choudhury, David Levitz, Emily Swanzey, James Lagowski, Molly Kulesz-Martin, Steven Jacques

Proceedings Volume 8207, 820708 (2012) https://doi.org/10.1117/12.906865

KEYWORDS: Optical coherence tomography, Signal attenuation, Reflectivity, Skin, Inflammation, Ear, Control systems, In vivo imaging, Tissues, Coherence imaging

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Proceedings Article | 9 February 2012 Paper

Extracting scattering coefficient and anisotropy factor of tissue using optical coherence tomography

Niloy Choudhury, Steven Jacques

Proceedings Volume 8221, 822111 (2012) https://doi.org/10.1117/12.907401

KEYWORDS: Tissue optics, Optical coherence tomography, Optical properties, Reflectivity, Scattering, Signal attenuation, Anisotropy, Tissues, Interfaces, Brain

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Proceedings Article | 30 January 2012 Paper

In vivo measurement of amplifying motion within the organ of Corti under sound stimulation using optical coherence tomography

Niloy Choudhury, Fangyi Chen, Dingjun Zha, Anders Fridberger, Jiefu Zheng, Steven Jacques, Ruikang Wang, Alfred Nuttall

Proceedings Volume 8213, 82131P (2012) https://doi.org/10.1117/12.910224

KEYWORDS: Motion measurement, Optical coherence tomography, In vivo imaging, Vibrometry, Laser Doppler velocimetry, Phase measurement, Mirrors, Interferometers, Ear, Scanning probe lithography

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SPIE Journal Paper | 1 April 2011 Open Access

Dermal reflectivity determined by optical coherence tomography is an indicator of epidermal hyperplasia and dermal edema within inflamed skin

Kevin Phillips, Yun Wang, Niloy Choudhury, Emily Swanzey, James Lagowski, Molly Kulesz-Martin, Steven Jacques, David Levitz

JBO, Vol. 16, Issue 04, 040503, (April 2011) https://doi.org/10.1117/12.10.1117/1.3567082

KEYWORDS: Optical coherence tomography, Reflectivity, Skin, Ear, Tissues, Inflammation, In vivo imaging, Coherence imaging, Signal attenuation, Scattering

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Proceedings Article | 12 February 2011 Paper

Imaging vibration of the cochlear partition of an excised guinea pig cochlea using phase-sensitive Fourier domain optical coherence tomography

Niloy Choudhury, Yaguang Zeng, Anders Fridberger, Fangyi Chen, Dingjun Zha, Alfred Nuttall, Ruikang Wang

Proceedings Volume 7889, 788930 (2011) https://doi.org/10.1117/12.875534

KEYWORDS: Optical coherence tomography, Interferometry, In vivo imaging, Heterodyning, Interferometers, System on a chip, Americium, Vibrometry, Bone, Ear

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Proceedings Article | 2 March 2010 Paper

Linking visual appearance of skin to the underlying optical properties using multispectral imaging

Niloy Choudhury, Ravikant Samatham, Steven Jacques

Proceedings Volume 7548, 75480G (2010) https://doi.org/10.1117/12.842648

KEYWORDS: Skin, Optical properties, Reflectivity, Scattering, Absorption, Blood, Mie scattering, Visualization, Rayleigh scattering, Tissues

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SPIE Journal Paper | 1 March 2010 Open Access

Quantitative characterization of developing collagen gels using optical coherence tomography

David Levitz, Monica Hinds, Niloy Choudhury, Noi Tran, Stephen Hanson, Steven Jacques

JBO, Vol. 15, Issue 02, 026019, (March 2010) https://doi.org/10.1117/12.10.1117/1.3377961

KEYWORDS: Collagen, Optical coherence tomography, Optical properties, Scattering, Reflectivity, Signal attenuation, Tissues, Anisotropy, Optical spheres, Data modeling

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Proceedings Article | 26 February 2010 Paper

Micro-tattoo guided OCT imaging of site specific inflammation

Kevin Phillips, Niloy Choudhury, Ravikant Samatham, Harvinder Singh, Steven Jacques

Proceedings Volume 7573, 75730S (2010) https://doi.org/10.1117/12.842570

KEYWORDS: Optical coherence tomography, Tissues, Skin, Inflammation, Animal model studies, Ear, Cancer, Skin cancer, Coherence imaging, In vivo imaging

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Proceedings Article | 26 February 2010 Paper

Measuring distance through turbid media: a simple frequency domain approach

A. Dayton, N. Choudhury, S. Prahl

Proceedings Volume 7573, 757304 (2010) https://doi.org/10.1117/12.842682

KEYWORDS: Distance measurement, Sensors, Light scattering, Modulation, Scattering, Medicine, Optical testing, Polyurethane, Signal detection, Phase measurement

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Proceedings Article | 23 February 2010 Paper

Light guided lumpectomy: is continuous wave or frequency domain more accurate

A. Dayton, N. Choudhury, S. Prahl

Proceedings Volume 7555, 755511 (2010) https://doi.org/10.1117/12.842667

KEYWORDS: Distance measurement, Sensors, Light sources, Signal detection, Waveguides, Surgery, Absorption, Scattering, Optical properties, Continuous wave operation

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Proceedings Article | 24 February 2009 Paper

Optically characterizing collagen gels made with different cell types

David Levitz, Niloy Choudhury, Keri Vartanian, Monica Hinds, Stephen Hanson, Steven Jacques

Proceedings Volume 7179, 717905 (2009) https://doi.org/10.1117/12.809687

KEYWORDS: Collagen, Optical coherence tomography, Optical properties, Control systems, Scattering, Tissues, Reflectivity, Data modeling, Signal attenuation, Anisotropy

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The ability of optical imaging techniques such as optical coherence tomography (OCT) to non-destructively characterize tissue-engineered constructs has generated enormous interest recently. Collagen gels are 3D structures that represent a simple common model of many engineered tissues that contain 2 primary scatterers: collagen and cells. We are testing the ability of OCT data to characterize the remodeling of such collagen-based constructs by 3 different types of cells: vascular smooth muscle cells (SMCs), endothelial cells (ECs), and osteoblasts (OBs). Collagen gels were prepared with SMCs, ECs, and OBs with a seeding density of 1×10⁶ cells/ml; additionally, acellular controls were also prepared. The disk-shaped constructs were allowed to remodel in the incubator for 5 days, with OCT imaging occurring on days 1 and 5. From the OCT data, the attenuation and reflectivity were evaluated by fitting the data to a theoretical model that relates the tissue optical properties (scattering coefficient and anisotropy factor) and imaging conditions to the OCT signal. The degree of gel compaction was determined from the volume of the culture medium that feeds the constructs. We found that gel compaction (relative to the acellular control) occurred in the SMC constructs, but not in the OB or EC constructs. The optical property data showed that at day 5 the SMC constructs had an overall higher reflectivity (lower g) relative to day 1, whereas there was no obvious change in reflectivity of the EC, OB constructs and acellular controls relative to day 1. Moreover, there was a difference in the attenuation of the OB constructs on day 5 relative to day 1, but not in the other constructs. The apparent decrease in anisotropy observed in the SMC constructs, but not in the OB and EC constructs and acellular controls, suggests that OCT is sensitive to the remodeling of the collagen matrix that accompanies gel compaction, and can offer highly localized information on the construct microstructure. The apparent increase in the scattering coefficient of the OB constructs is believed to be caused by a higher rate of proliferation by these cell types relative to the others. Overall, these results suggest that the optical properties of collagen gels contain information on both cell number and collagen gel microstructure.

Proceedings Article | 12 February 2009 Paper

The effect of wavelength on optical properties extracted from images of engineered tissue

David Levitz, Kevin Phillips, Lin An, Frederic Truffer, Ravikant Samatham, Niloy Choudhury, Monica Hinds, Stephen Hanson, Steven Jacques

Proceedings Volume 7179, 717906 (2009) https://doi.org/10.1117/12.809653

KEYWORDS: Optical properties, Collagen, Optical coherence tomography, Confocal microscopy, Reflectivity, Anisotropy, Tissue optics, Scattering, Data modeling, Signal attenuation

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Proceedings Article | 1 March 2008 Paper

Measuring tissue optical properties in vivo using reflectance-mode confocal microscopy and OCT

Steven Jacques, Ravikant Samatham, Niloy Choudhury, Yongji Fu, David Levitz

Proceedings Volume 6864, 68640B (2008) https://doi.org/10.1117/12.761803

KEYWORDS: Optical coherence tomography, Scattering, Tissues, Photons, Confocal microscopy, Signal attenuation, Light scattering, Tissue optics, Reflectivity, Monte Carlo methods

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Proceedings Article | 21 February 2008 Paper

Microscopic heterogeneity vs. macroscopic homogeneity in tissue phantoms using reflectance-mode confocal scanning laser microscopy

Ravikant Samatham, David Levitz, Reid Fletcher, Yongji Fu, Steven Jacques

Proceedings Volume 6870, 68700H (2008) https://doi.org/10.1117/12.764073

KEYWORDS: Scattering, Confocal microscopy, Optical properties, Laser scattering, Optical spheres, Particles, Laser tissue interaction, Anisotropy, Chemical elements, Microscopy

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Proceedings Article | 18 February 2008 Paper

In vivo imaging and vibration measurement of Guinea pig cochlea

Niloy Choudhury, Fangyi Chen, Jiefu Zheng, Alfred Nuttall, Steven Jacques

Proceedings Volume 6847, 68471V (2008) https://doi.org/10.1117/12.764663

KEYWORDS: Optical coherence tomography, Phase measurement, Reflectivity, Interferometry, Vibrometry, Scanning probe lithography, In vivo imaging, Tissues, Mirrors, Imaging systems

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SPIE Journal Paper | 1 March 2007 Open Access

In vivo imaging and low-coherence interferometry of organ of Corti vibration

Fangyi Chen, Niloy Choudhury, Jiefu Zheng, Scott Matthews, Alfred Nuttall, Steven Jacques

JBO, Vol. 12, Issue 02, 021006, (March 2007) https://doi.org/10.1117/12.10.1117/1.2717134

KEYWORDS: Optical coherence tomography, Calibration, Interferometry, Reflectivity, In vivo imaging, Mirrors, Signal detection, Tissues, Vibrometry, Bone

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Proceedings Article | 16 February 2007 Paper

Specifying tissue optical properties using axial dependence of confocal reflectance images: confocal scanning laser microscopy and optical coherence tomography

S. Jacques, R. Samatham, N. Choudhury, D. Gareau

Proceedings Volume 6446, 64460N (2007) https://doi.org/10.1117/12.716535

KEYWORDS: Confocal microscopy, Optical coherence tomography, Tissues, Scattering, Reflectivity, Optical properties, Tissue optics, Signal attenuation, Photons, Microscopy

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Proceedings Article | 14 August 2003 Paper

Modulation-doped InGaAsP quantum well laser and modulator

Niloy Dutta, Niloy Choudhury, Guanghao Zhu, Hong Cong

Proceedings Volume 5246, (2003) https://doi.org/10.1117/12.513627

KEYWORDS: Modulation, Doping, Quantum wells, Modulators, Spectrum analysis, Measurement devices, Solids, Interference (communication), Optical amplifiers, Laser cutting

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Proceedings Article | 26 July 2001 Paper

Measurement and analysis of chirp for four-wave mixing

Huimin Chen, Niloy Choudhury, Niloy Dutta

Proceedings Volume 4386, (2001) https://doi.org/10.1117/12.434220

KEYWORDS: Four wave mixing, Optical amplifiers, Semiconductor optical amplifiers, Pulsed laser operation, Numerical simulations, Solids, Nonlinear optics, Signal processing, Semiconductors

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Proceedings Article | 17 May 2001 Paper

80-Gb/s optical demultiplexing using modulators

Niloy Choudhury, Mostafa El-Aasser, Niloy Dutta

Proceedings Volume 4285, (2001) https://doi.org/10.1117/12.426887

KEYWORDS: Modulators, Time division multiplexing, Modulation, Multiplexing, Picosecond phenomena, Phase shift keying, Channel projecting optics, Optical amplifiers, Polarization

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Proceedings Article | 17 May 2001 Paper

Stable high-repetition-rate pulses from a fiber laser

Niloy Choudhury, Anguel Nikolov, Niloy Dutta

Proceedings Volume 4285, (2001) https://doi.org/10.1117/12.426892

KEYWORDS: Fiber lasers, Mode locking, Modulation, Picosecond phenomena, Semiconductor optical amplifiers, Optical amplifiers, Erbium, Fiber amplifiers, Physics, Active optics

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Proceedings Article | 2 February 2001 Paper

Stable optical pulse generation using rational harmonic mode-locked fiber laser

Niloy Choudhury, C. Wu, Niloy Dutta

Proceedings Volume 4216, (2001) https://doi.org/10.1117/12.414111

KEYWORDS: Fiber lasers, Mode locking, Semiconductor optical amplifiers, Modulation, Polarization, Semiconductor lasers, Optical communications, Feedback control, Fiber amplifiers, Optical amplifiers

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Proceedings Article | 18 July 2000 Paper

Modulation-doped InGaAsP QW laser emitting at 1.55 um

Niloy Choudhury, Niloy Dutta

Proceedings Volume 4042, (2000) https://doi.org/10.1117/12.391903

KEYWORDS: Modulation, Doping, Quantum wells, Electrons, Solids, Radon, Laser cutting, Optical components, Aerospace engineering, Dielectric polarization

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Proceedings Article | 18 July 2000 Paper

Mode-locked InGaAsP laser

Honglei Fan, C. Wu, Niloy Choudhury, Mostafa El-Aasser, Niloy Dutta, Uziel Koren, Alfonso Piccirilli

Proceedings Volume 4042, (2000) https://doi.org/10.1117/12.391902

KEYWORDS: Mode locking, Pulsed laser operation, Modulation, Fiber coupled lasers, Picosecond phenomena, Waveguides, Amplifiers, Laser damage threshold, Semiconducting wafers, Single mode fibers

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Proceedings Article | 26 November 1999 Paper

Linewidth enhancement factor in electroabsorption modulated lasers

Niloy Choudhury, Niloy Dutta

Proceedings Volume 3847, (1999) https://doi.org/10.1117/12.371254

KEYWORDS: Modulators, Modulation, Resistance, Dispersion, Semiconductors, Optical fibers, Solids, Semiconductor lasers, Receivers, Absorption

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Showing 5 of 31 publications

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