Dr. Janaka C. Ranasinghesagara Profile

Dr. Janaka C. Ranasinghesagara

Associate Specialist at Univ of California Irvine

SPIE Involvement:

Author | Science Fair Judge

Area of Expertise:

Optical Scattering , Photoacoustic , Light propagation in tissue , Modeling Focused Beam Propagation , Oblique Incidence Reflectance , Optical Scanning systems

Publications (18)

SPIE Journal Paper | 12 April 2022 Open Access

Open Access

MCCL: an open-source software application for Monte Carlo simulations of radiative transport

Carole Hayakawa, Lisa Malenfant, Janaka Ranasinghesagara, David Cuccia, Jerome Spanier, Vasan Venugopalan

JBO, Vol. 27, Issue 08, 083005, (April 2022) https://doi.org/10.1117/12.10.1117/1.JBO.27.8.083005

KEYWORDS: Monte Carlo methods, Sensors, Tissues, Tissue optics, Databases, Reflectivity, Interfaces, Absorption, Natural surfaces, Computer simulations

Read Abstract +

Proceedings Article | 23 February 2011 Paper

Paper

Improved depth-of-field photoacoustic microscopy with a custom high-frequency annular array transducer

Huihong Lu, Peng Shao, Janaka Ranasinghesagara, Tim DeWolf, Tyler Harrison, William Gibson, Roger Zemp

Proceedings Volume 7899, 78993R (2011) https://doi.org/10.1117/12.875601

KEYWORDS: Transducers, Ultrasonography, Photoacoustic spectroscopy, Epoxies, Photoacoustic microscopy, Acoustics, Optical simulations, Ferroelectric polymers, Device simulation, Lead

Read Abstract +

SPIE Journal Paper | 1 September 2010 Open Access

Open Access

Optical resolution photoacoustic microscopy using novel high-repetition-rate passively Q-switched microchip and fiber lasers

Wei Shi, Shaun Kerr, Ilya Utkin, Janaka Ranasinghesagara, Lei Pan, Yogesh Godwal, Roger Zemp, Robert Fedosejevs

JBO, Vol. 15, Issue 05, 056017, (September 2010) https://doi.org/10.1117/12.10.1117/1.3502661

KEYWORDS: Fiber lasers, Photoacoustic spectroscopy, Mirrors, Pulsed laser operation, Acoustics, Transducers, Photoacoustic microscopy, Laser systems engineering, Photoacoustic imaging, Ultrasonography

Read Abstract +

SPIE Journal Paper | 1 September 2010 Open Access

Open Access

Photoacoustic and high-frequency power Doppler ultrasound biomicroscopy: a comparative study

Yan Jiang, Tyler Harrison, Janaka Ranasinghesagara, Roger Zemp

JBO, Vol. 15, Issue 05, 056008, (September 2010) https://doi.org/10.1117/12.10.1117/1.3491126

KEYWORDS: Doppler effect, Ultrasonography, Blood, Tissues, Photoacoustic spectroscopy, Imaging systems, Transducers, Electronic filtering, Tissue optics, Blood vessels

Read Abstract +

SPIE Journal Paper | 1 July 2010 Open Access

Open Access

Combined photoacoustic and oblique-incidence diffuse reflectance system for quantitative photoacoustic imaging in turbid media

Janaka Ranasinghesagara, Roger Zemp

JBO, Vol. 15, Issue 04, 046016, (July 2010) https://doi.org/10.1117/12.10.1117/1.3470336

KEYWORDS: Photoacoustic spectroscopy, Absorption, Optical properties, Diffuse reflectance spectroscopy, Photoacoustic imaging, Transducers, Laser scattering, Ultrasonography, Tissue optics, Laser tissue interaction

Read Abstract +

Proceedings Article | 24 February 2010 Paper

Paper

Fast-scanning ultrasonic-photoacoustic biomicroscope: in vivo performance

Tyler Harrison, Janaka Ranasinghesagara, Huihong Lu, Roger Zemp

Proceedings Volume 7564, 75641X (2010) https://doi.org/10.1117/12.842118

KEYWORDS: Ultrasonography, Photoacoustic spectroscopy, In vivo imaging, Imaging systems, Transducers, Photoacoustic imaging, Control systems, Visualization, Oxygen, Ultrasonics

Read Abstract +

Proceedings Article | 24 February 2010 Paper

Paper

Integrated photoacoustic and oblique incidence diffuse reflectance system for quantitative optical sensing in turbid media

Janaka Ranasinghesagara, Roger Zemp

Proceedings Volume 7564, 756421 (2010) https://doi.org/10.1117/12.842108

KEYWORDS: Photoacoustic spectroscopy, Absorption, Tissue optics, Transducers, Optical properties, Ultrasonography, Prisms, Laser scattering, Scattering, Diffuse reflectance spectroscopy

Read Abstract +

Proceedings Article | 24 February 2010 Paper

Paper

Monte Carlo modeling for photoacoustic-based transport-regime optical property estimation

Janaka Ranasinghesagara, Roger Zemp

Proceedings Volume 7564, 75640F (2010) https://doi.org/10.1117/12.842038

KEYWORDS: Photoacoustic spectroscopy, Optical properties, Scattering, Tissue optics, Monte Carlo methods, Light scattering, Laser scattering, Inverse optics, Absorption, Geometrical optics

Read Abstract +

Proceedings Article | 24 February 2010 Paper

Paper

High repetition rate passively Q-switched fiber and microchip lasers for optical resolution photoacoustic imaging

Wei Shi, Ilya Utkin, Janaka Ranasinghesagara, Lei Pan, Yogesh Godwal, Shaun Kerr, Roger Zemp, Robert Fedosejevs

Proceedings Volume 7564, 75640X (2010) https://doi.org/10.1117/12.842533

KEYWORDS: Fiber lasers, Photoacoustic spectroscopy, Pulsed laser operation, Acoustics, Transducers, Ultrasonography, Imaging systems, Photoacoustic microscopy, Prisms, Laser optics

Read Abstract +

Proceedings Article | 23 February 2010 Paper

Paper

Combined photoacoustic and high-frequency power Doppler ultrasound imaging

Yan Jiang, Tyler Harrison, Janaka Ranasinghesagara, Roger Zemp

Proceedings Volume 7564, 756404 (2010) https://doi.org/10.1117/12.841044

KEYWORDS: Ultrasonography, Doppler effect, Tissues, Photoacoustic spectroscopy, Signal processing, Blood, Tissue optics, Ultrasonics, Transducers, Absorption

Read Abstract +

SPIE Journal Paper | 1 July 2009 Open Access

Open Access

Photoacoustic technique for assessing optical scattering properties of turbid media

Janaka Ranasinghesagara, Yan Jian, Xuhui Chen, Kory Mathewson, Roger Zemp

JBO, Vol. 14, Issue 04, 040504, (July 2009) https://doi.org/10.1117/12.10.1117/1.3200922

KEYWORDS: Photoacoustic spectroscopy, Tissue optics, Ultrasonography, Scattering, Laser scattering, Tissues, Liquids, Light scattering, Soft tissue optics, Acoustics

Read Abstract +

Proceedings Article | 28 April 2009 Paper

Paper

Nondestructive real-time monitoring of fiber formation in meat analogs

J. Ranasinghesagara, F. Hsieh, H. E. Huff, G. Yao

Proceedings Volume 7315, 73150D (2009) https://doi.org/10.1117/12.817349

KEYWORDS: Analog electronics, Image processing, Visualization, Reflectivity, Nondestructive evaluation, Mirrors, Spatial resolution, Fiber characterization, CCD cameras, Cameras

Read Abstract +

Proceedings Article | 25 February 2009 Paper

Paper

Development of a fast-scanning combined ultrasound-photoacoustic biomicroscope

Roger Zemp, Huihong Lu, Kory Mathewson, Janaka Ranasinghesagara, Yan Jiang, Andrew Walsh, Xuhui Chen

Proceedings Volume 7177, 717711 (2009) https://doi.org/10.1117/12.809296

KEYWORDS: Ultrasonography, Photoacoustic spectroscopy, Imaging systems, Photoacoustic imaging, Transducers, Ultrasonics, Data acquisition, Tissue optics, Photoacoustic microscopy, Visualization

Read Abstract +

Proceedings Article | 25 February 2009 Paper

Paper

A photoacoustic method for optical scattering measurements in turbid media

Roger Zemp, Janaka Ranasinghesagara, Yan Jiang, Xuhui Chen, Kory Mathewson

Proceedings Volume 7177, 71770Q (2009) https://doi.org/10.1117/12.809276

KEYWORDS: Photoacoustic spectroscopy, Tissue optics, Tissues, Scattering, Ultrasonography, Prisms, Transducers, Acoustics, Laser scattering, Absorption

Read Abstract +

Proceedings Article | 15 April 2008 Paper

Paper

Imaging skeletal muscle with linearly polarized light

X. Li, J. Ranasinghesagara, G. Yao

Proceedings Volume 6983, 698304 (2008) https://doi.org/10.1117/12.786865

KEYWORDS: Polarization, Chemical elements, Reflectivity, Imaging systems, Scattering, Tissues, Wave plates, Mirrors, CCD cameras, Rayleigh scattering

Read Abstract +

Proceedings Article | 12 October 2007 Paper

Paper

Study of photon migration in skeletal muscle

J. Ranasinghesagara, G. Yao

Proceedings Volume 6761, 67610I (2007) https://doi.org/10.1117/12.733359

KEYWORDS: Reflectivity, Geometrical optics, Diffraction, Monte Carlo methods, Light scattering, Photon transport, Scattering, 3D modeling, Optical properties, Light wave propagation

Read Abstract +

Proceedings Article | 23 October 2006 Paper

Paper

Characterizing fiber formation in meat analogs using an anisotropic photon migration model

J. Ranasinghesagara, F. Hsieh, G. Yao

Proceedings Volume 6381, 63810D (2006) https://doi.org/10.1117/12.684747

KEYWORDS: Reflectivity, Probability theory, Analog electronics, Proteins, Image processing, 3D modeling, Fiber characterization, Geometrical optics, Scattering, Nondestructive evaluation

Read Abstract +

Proceedings Article | 9 November 2005 Paper

Paper

Quantifying Fiber Formation in Meat Analogs under High Moisture Extrusion using Image Processing

J. Ranasinghesagara, F. Hsieh, G. Yao

Proceedings Volume 5996, 59960G (2005) https://doi.org/10.1117/12.629639

KEYWORDS: Proteins, Polarization, Luminescence, Image processing, Edge detection, Analog electronics, Statistical analysis, Hough transforms, Structured optical fibers, Visualization

Read Abstract +

Showing 5 of 18 publications

SIGN IN TO:

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Advertisement

Advertisement