Multispectral angular domain optical tomography in scattering media with argon and diode laser sources

2007 ◽  
Author(s):  
Paulman K. Y. Chan ◽  
Fartash Vasefi ◽  
Glenn H. Chapman ◽  
Bozena Kaminska ◽  
Nick Pfeiffer
Keyword(s):  
Diode Laser ◽  
Optical Tomography ◽  
Angular Domain ◽  
Scattering Media ◽  
Laser Sources

scholarly journals Multi-spectral angular domain optical imaging in biological tissues using diode laser sources

2008 ◽  
Vol 16 (19) ◽  
pp. 14456 ◽  
Author(s):  
Fartash Vasefi ◽  
Bozena Kaminska ◽  
Paulman K. Y. Chan ◽  
Glenn H. Chapman
Keyword(s):  
Optical Imaging ◽  
Diode Laser ◽  
Biological Tissues ◽  
Angular Domain ◽  
Laser Sources

scholarly journals Diagnostics of Human Body Cavities Using Diode Laser Gas Spectroscopy

2008 ◽  
Vol 2 (2) ◽  
Author(s):  
M. Cassel-Engquist ◽  
L. Persson ◽  
K. Svanberg ◽  
S. Svanberg
Keyword(s):  
Clinical Trial ◽  
Diode Laser ◽  
Medical Application ◽  
University Hospital ◽  
Scattering Media ◽  
Laser Absorption ◽  
Initial Clinical Trial ◽  
Frontal Sinuses ◽  
Diode Laser Absorption ◽  
Nose And Throat

We have developed a technique to measure gas non-intrusive in scattering media, such as human tissue. The technique was first demonstrated for test samples in 2001 by our group and utilizes diode laser absorption spectroscopy to monitor molecular oxygen and water vapor. The focus of medical application has been on sinuses, both maxillary and frontal sinuses and the potential of the technique has been shown on volunteers. A spin-off company named GasPorOx AB has been formed with the aim to develop a product used to improve the diagnosis of the sinus infections. A portable fiber-guided system has been developed and is used in an ongoing initial clinical trial in collaboration with the Ear, Nose and Throat Clinic, the Oncology and Diagnostic radiology clinics at the Lund University Hospital.

Optical Tomography With a Least Square Finite Element Formulation of the Collimated Irradiation in Frequency Domain

2010 ◽  
Author(s):  
Olivier Balima ◽  
Joan Boulanger ◽  
Andre´ Charette ◽  
Daniel Marceau
Keyword(s):  
Finite Element ◽  
Optical Properties ◽  
Frequency Domain ◽  
Complex Geometry ◽  
Numerical Study ◽  
Optical Tomography ◽  
Least Square ◽  
Finite Element Formulation ◽  
Element Formulation ◽  
Scattering Media

This paper presents a numerical study of optical tomography in frequency domain for the reconstruction of optical properties of scattering and absorbing media with collimated irradiation light sources. The forward model is a least square finite element formulation of the collimated irradiation problem where the intensity is separated into its collimated and scattered parts. This model does not use any empirical stabilization and moreover the collimated source direction is taken into account. The inversion uses a gradient type minimization method where the gradient is computed through an adjoint formulation. Scaling is used to avoid numerical round errors, as the output readings at detectors are very low. Numerical reconstructions of optical properties of absorbing and scattering media with simulated data (noised and noise-free) are achieved in a complex geometry with satisfactory results. The results show that complex geometries are well handled with the proposed method.

Broadband InGaAs tapered diode laser sources for optical coherence radar and coherence tomography

2005 ◽  
Vol 86 (19) ◽  
pp. 191101 ◽  
Author(s):  
Oliver Casel ◽  
Harry Fuchs ◽  
Marc A. Tremont ◽  
Dirk Woll ◽  
Richard Wallenstein
Keyword(s):  
Diode Laser ◽  
Optical Coherence ◽  
Tapered Diode Laser ◽  
Laser Sources
Sign in / Sign up

Export Citation Format

Share Document