Evidence of a millimeter size virtual light source for acousto-optical tomography in scattering media using a chirp modulation of the ultrasound

2003 ◽  
Author(s):  
Michael Atlan ◽  
Francois Ramaz ◽  
Benoit C. Forget ◽  
Albert-Claude Boccara
Keyword(s):  
Light Source ◽  
Optical Tomography ◽  
Scattering Media ◽  
Chirp Modulation

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.

Use of backprojection algorithms of filtered shadows for optical tomography of strongly scattering media

2001 ◽  
Author(s):  
Alexander G. Kalintsev ◽  
Alexander B. Konovalov ◽  
Olga V. Kravtsenyuk ◽  
Igor I. Kutuzov ◽  
Oleg V. Lyamtsev ◽  
...  
Keyword(s):  
Optical Tomography ◽  
Scattering Media
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