Alwin Kienle

Summary

Affiliation: University of Ulm
Country: Germany

Publications

  1. ncbi request reprint Light propagation in dry and wet softwood
    Alwin Kienle
    Institut fur Lasertechnologien in der Medizin und Messtechnik, Helmholtzstr 12, D 89081 Ulm, Germany
    Opt Express 16:9895-906. 2008
  2. ncbi request reprint Light propagation in dentin: influence of microstructure on anisotropy
    Alwin Kienle
    Institut fur Lasertechnologien in der Medizin und Messtechnik, Helmholtzstr 12, D 89081 Ulm, Germany
    Phys Med Biol 48:N7-14. 2003
  3. doi request reprint Light scattering by multiple spheres: comparison between Maxwell theory and radiative-transfer-theory calculations
    Florian Voit
    Institut fur Lasertechnologien in der Medizin und Messtechnik, Helmholtzstr 12, D 89081 Ulm, Germany
    Opt Lett 34:2593-5. 2009
  4. doi request reprint 250 years Lambert surface: does it really exist?
    Alwin Kienle
    Institut for Lasertechnologien in der Medizin und Messtechnik, Ulm, Germany
    Opt Express 19:3881-9. 2011
  5. ncbi request reprint Anisotropic light diffusion: an oxymoron?
    Alwin Kienle
    Institut fur Lasertechnologien in der Medizin und Messtechnik, Helmholtzstrasse 12, D 89081 Ulm, Germany
    Phys Rev Lett 98:218104. 2007
  6. pmc Infinite space Green's function of the time-dependent radiative transfer equation
    Andre Liemert
    Institut für Lasertechnologien in der Medizin und Meßtechnik, Helmholtzstr 12, D 89081 Ulm, Germany
    Biomed Opt Express 3:543-51. 2012
  7. ncbi request reprint Determination of the optical properties of anisotropic biological media using an isotropic diffusion model
    Alwin Kienle
    Institut fur Lasertechnologien in der Medizin und Messtechnik, Helmholtzstrasse 12, D 89081 Ulm, Germany
    J Biomed Opt 12:014026. 2007
  8. ncbi request reprint Magnification--a new look at a long-known optical property of dentin
    A Kienle
    Institut fur Lasertechnologien in der Medizin und Messtechnik, Helmholtzstrasse 12, D 89081 Ulm, Germany
    J Dent Res 85:955-9. 2006
  9. ncbi request reprint Light guiding in biological tissue due to scattering
    Alwin Kienle
    Institut fur Lasertechnologien in der Medizin und Messtechnik, Helmholtzstrasse 12, D 89081 Ulm, Germany
    Phys Rev Lett 97:018104. 2006
  10. ncbi request reprint Light diffusion through a turbid parallelepiped
    Alwin Kienle
    Institut fur Lasertechnologien in der Medizin und Messtechnik, Helmholtzstrasse 12, D 89081 Ulm, Germany
    J Opt Soc Am A Opt Image Sci Vis 22:1883-8. 2005

Detail Information

Publications36

  1. ncbi request reprint Light propagation in dry and wet softwood
    Alwin Kienle
    Institut fur Lasertechnologien in der Medizin und Messtechnik, Helmholtzstr 12, D 89081 Ulm, Germany
    Opt Express 16:9895-906. 2008
    ..Good qualitative agreement was obtained between the experimentally and theoretically derived optical properties...
  2. ncbi request reprint Light propagation in dentin: influence of microstructure on anisotropy
    Alwin Kienle
    Institut fur Lasertechnologien in der Medizin und Messtechnik, Helmholtzstr 12, D 89081 Ulm, Germany
    Phys Med Biol 48:N7-14. 2003
    ..A pronounced anisotropic scattering pattern was found experimentally and theoretically. In addition, intensity peaks were measured which are shown to be caused by light diffraction by the tubules...
  3. doi request reprint Light scattering by multiple spheres: comparison between Maxwell theory and radiative-transfer-theory calculations
    Florian Voit
    Institut fur Lasertechnologien in der Medizin und Messtechnik, Helmholtzstr 12, D 89081 Ulm, Germany
    Opt Lett 34:2593-5. 2009
    ..For the considered case, we found that deviations due to radiative transfer theory remain small, even for concentrations up to ca. 20 vol. %...
  4. doi request reprint 250 years Lambert surface: does it really exist?
    Alwin Kienle
    Institut for Lasertechnologien in der Medizin und Messtechnik, Ulm, Germany
    Opt Express 19:3881-9. 2011
    ..In contrast to what is believed so far, we demonstrate theoretically and experimentally that huge deviations from the Lambert law are ubiquitous. This finding is important for many applications such as those in biomedical optics...
  5. ncbi request reprint Anisotropic light diffusion: an oxymoron?
    Alwin Kienle
    Institut fur Lasertechnologien in der Medizin und Messtechnik, Helmholtzstrasse 12, D 89081 Ulm, Germany
    Phys Rev Lett 98:218104. 2007
    ..Contrary to what has been reported so far, we find that even in the "diffusive regime" the anisotropic diffusion equation does not describe correctly the light propagation in anisotropic random media...
  6. pmc Infinite space Green's function of the time-dependent radiative transfer equation
    Andre Liemert
    Institut für Lasertechnologien in der Medizin und Meßtechnik, Helmholtzstr 12, D 89081 Ulm, Germany
    Biomed Opt Express 3:543-51. 2012
    ..The final solutions are analytical regarding the time variable and given by a superposition of real and complex exponential functions. The obtained expressions were successfully validated with Monte Carlo simulations...
  7. ncbi request reprint Determination of the optical properties of anisotropic biological media using an isotropic diffusion model
    Alwin Kienle
    Institut fur Lasertechnologien in der Medizin und Messtechnik, Helmholtzstrasse 12, D 89081 Ulm, Germany
    J Biomed Opt 12:014026. 2007
    ..Contrarily, the derived reduced scattering coefficient depends strongly on the measurement direction in both domains. Measurements of the steady-state and time-resolved reflectance from bovine tendon confirm the theoretical findings...
  8. ncbi request reprint Magnification--a new look at a long-known optical property of dentin
    A Kienle
    Institut fur Lasertechnologien in der Medizin und Messtechnik, Helmholtzstrasse 12, D 89081 Ulm, Germany
    J Dent Res 85:955-9. 2006
    ..We found that the optical anisotropy of dentin can be fully explained with this model. We concluded that the magnification property of dentin is due to multiple scattering by the dental microstructure...
  9. ncbi request reprint Light guiding in biological tissue due to scattering
    Alwin Kienle
    Institut fur Lasertechnologien in der Medizin und Messtechnik, Helmholtzstrasse 12, D 89081 Ulm, Germany
    Phys Rev Lett 97:018104. 2006
    ..Exploiting this concept, light can be guided in arbitrary directions or locations without involving reflections or wave effects...
  10. ncbi request reprint Light diffusion through a turbid parallelepiped
    Alwin Kienle
    Institut fur Lasertechnologien in der Medizin und Messtechnik, Helmholtzstrasse 12, D 89081 Ulm, Germany
    J Opt Soc Am A Opt Image Sci Vis 22:1883-8. 2005
    ..Applications of the derived solutions, including the determination of the optical properties of the turbid parallelepiped, are discussed...
  11. ncbi request reprint Anisotropy of light propagation in biological tissue
    A Kienle
    Institut fur Lasertechnologien in der Medizin und Messtechnik, Helmholtzstrasse 12, D 89081 Ulm, Germany
    Opt Lett 29:2617-9. 2004
    ..These observations have consequences for noninvasive determination of the optical properties of tissue as well as for the diagnosis of early tissue alterations...
  12. doi request reprint Optimized goniometer for determination of the scattering phase function of suspended particles: simulations and measurements
    Florian Foschum
    Institut für Lasertechnologien in der Medizin und Meßtechnik an der Universität Ulm, Helmholtzstr 12, 89081 Ulm, Germany
    J Biomed Opt 18:85002. 2013
    ..Furthermore, the scattering phase function of different fat emulsions, like Intralipid, was determined precisely...
  13. ncbi request reprint Scattering of light by multiple dielectric cylinders: comparison of radiative transfer and Maxwell theory
    Jan Schafer
    Institut für Lasertechnologien in der Medizin und Mebtechnik, Ulm, Germany
    Opt Lett 33:2413-5. 2008
    ..In contrast to recently published results, it is shown that the radiative transfer equation is a useful approximation for small cylinder concentrations...
  14. doi request reprint Broadband absorption spectroscopy of turbid media using a dual step steady-state method
    Florian Foschum
    Institut für Lasertechnologien in der Medizin und Messtechnik an der Universität Ulm, Helmholtzstrasse 12, 89081 Ulm, Germany
    J Biomed Opt 17:037009. 2012
    ..The absorption coefficient of the investigated phantoms varying by four orders of magnitude could be determined with an average error of less than 10%...
  15. ncbi request reprint Phase function measurements on nonspherical scatterers using a two-axis goniometer
    Florian Klaus Forster
    Institut fur Lasertechnologien in der Medizin und Messtechnik, Helmholtzstr 12, D 89081 Ulm, Germany
    J Biomed Opt 11:024018. 2006
    ..A multiple scattering configuration composed of two parallel cylinders is also examined. Finally, the phase function of dentin slabs is measured and its dependence on the dental microstructure is discussed...
  16. doi request reprint Multiple scattering of polarized light: comparison of Maxwell theory and radiative transfer theory
    Florian Voit
    Institut für Lasertechnologien in der Medizin und Meßtechnik, Helmholtzstr 12, D 89081 Ulm, Germany
    J Biomed Opt 17:045003. 2012
    ..The results are in overall good agreement between the two methods with deviations related to dependent scattering being prominent for high volume concentrations and high scattering angles...
  17. doi request reprint Light diffusion in N-layered turbid media: steady-state domain
    Andre Liemert
    Institut fur Lasertechnologien in der Medizin und Messtechnik, Helmholtzstrasse 12, Ulm, D 89081 Germany
    J Biomed Opt 15:025003. 2010
    ..Additionally, the solutions of the diffusion equation are compared to Monte Carlo simulations for turbid media having up to 20 layers...
  18. doi request reprint Light diffusion in N-layered turbid media: frequency and time domains
    Andre Liemert
    Institut fur Lasertechnologien in der Medizin und Messtechnik, Helmholtzstrasse 12, Ulm, D 89081 Germany
    J Biomed Opt 15:025002. 2010
    ....
  19. doi request reprint Light propagation in structural anisotropic media in the steady-state and time domains
    Alwin Kienle
    Institut für Lasertechnologien in der Medizin und Meßtechnik, Helmholtzstraße 12, D 89081 Ulm, Germany
    Phys Med Biol 58:6205-23. 2013
    ..However, it is shown that in the time domain it is possible to retrieve useful values for the optical properties using the isotropic and the anisotropic diffusion equations. ..
  20. doi request reprint Determination of the optical properties of turbid media by measurements of the spatially resolved reflectance considering the point-spread function of the camera system
    Marco Pilz
    Institut fur Lasertechnologien in der Medizin und Messtechnik an der Universitat Ulm, Helmholtzstrasse 12, 89081 Ulm, Germany
    J Biomed Opt 13:054047. 2008
    ....
  21. ncbi request reprint Angular and spectrally resolved investigation of single particles by darkfield scattering microscopy
    Thomas Rothe
    Institut für Lasertechnologien in der Medizin und Meßtechnik, Helmholtzstr 12, 89081 Ulm, Germany
    J Biomed Opt 17:117006. 2012
    ..The estimated diameter values in the angular and the spectral mode were in an excellent agreement with deviations of less than 0.20%...
  22. ncbi request reprint Light diffusion in a radially N-layered cylinder
    Andre Liemert
    Institut für Lasertechnologien in der Medizin und Meßtechnik, Helmholtzstrasse 12, D 89081 Ulm, Germany
    Phys Rev E Stat Nonlin Soft Matter Phys 84:041911. 2011
    ..The analytical solutions were applied to calculate the light propagation in models of the forearm and the finger, demonstrating the improvement in analysis of hemodynamics measurements compared to the formulas used so far...
  23. doi request reprint Analytical solutions of the simplified spherical harmonics equations
    Andre Liemert
    Institut fur Lasertechnologien in der Medizin und Messtechnik, Helmholtzstrasse 12, D 89081 Ulm, Germany
    Opt Lett 35:3507-9. 2010
    ....
  24. ncbi request reprint Optical properties of fat emulsions
    Rene Michels
    Institut fur Lasertechnologien in der Medizin und Messtechnik, Helmholtzstr 12, D 89081 Ulm, Germany
    Opt Express 16:5907-25. 2008
    ..Simple equations for the calculation of the absorption coefficient, the scattering coefficient, the reduced scattering coefficient, the g factor, and the phase function of all measured samples are presented...
  25. ncbi request reprint Green's function of the time-dependent radiative transport equation in terms of rotated spherical harmonics
    Andre Liemert
    Institut für Lasertechnologien in der Medizin und Meßtechnik, Helmholtzstr 12, D 89081 Ulm, Germany
    Phys Rev E Stat Nonlin Soft Matter Phys 86:036603. 2012
    ..Additionally, a special solution for the isotropically scattering infinite medium is given. The Monte Carlo method is used for a successful verification of the derived solution...
  26. ncbi request reprint Analysis of ultrashort feedback regulation in human placenta: synthesis and secretion of GnRH by human trophoblastic cells
    B Kleine
    Department of Gynaecology and Obstetrics, University of Ulm, Germany
    Horm Metab Res 32:216-23. 2000
    ..Gonadotropin-releasing hormone (GnRH) presumably controls placental growth and functions by autocrine/paracrine mechanisms, and is therefore an important part of the neuroendocrine network in human placenta...
  27. doi request reprint Computation of the optical properties of turbid media from slope and curvature of spatially resolved reflectance curves
    Marion Jäger
    Institut für Lasertechnologien in der Medizin und Meßtechnik, Helmholtzstraße 12, D 89081 Ulm, Germany
    Phys Med Biol 58:N211-6. 2013
    ..In effect, the results for the determined optical properties improved in comparison to the above explained method. Finally, the procedure was compared to an artificial neural network that was trained without using the derivatives. ..
  28. doi request reprint Comparison between radiative transfer theory and the simplified spherical harmonics approximation for a semi-infinite geometry
    Andre Liemert
    Institut fur Lasertechnologien in der Medizin und Messtechnik, Ulm, Germany
    Opt Lett 36:4041-3. 2011
    ..In general, it is shown that the SP3 equations provide better results than the diffusion approximation in media with high absorption coefficient values but no improvement is found for small distances to the source...
  29. ncbi request reprint Analytical Green's function of the radiative transfer radiance for the infinite medium
    Andre Liemert
    Institut für Lasertechnologien in der Medizin und Meßtechnik, Helmholtzstrasse12, D 89081 Ulm, Germany
    Phys Rev E Stat Nonlin Soft Matter Phys 83:036605. 2011
    ..Comparison with Monte Carlo simulations showed that the SP{N} radiance, although being more exact than the radiance derived from diffusion theory, has relatively large errors in many relevant cases...
  30. doi request reprint Spatially modulated light source obliquely incident on a semi-infinite scattering medium
    Andre Liemert
    Institut fur Lasertechnologien in der Medizin und Messtechnik, Helmholtzstr 12, D 89081 Ulm, Germany
    Opt Lett 37:4158-60. 2012
    ..The obtained equations are verified and illustrated by comparisons with Monte Carlo simulations and the diffusion approximation, respectively...
  31. doi request reprint Simulated and measured optical coherence tomography images of human enamel
    Alwin Kienle
    Institut für Lasertechnologien in der Medizin und Meßtechnik an der Universität Ulm, Ulm, Germany
    Opt Lett 37:3246-8. 2012
    ..The essential features of the measured images including the Hunter-Schreger bands could be explained by the simulations...
  32. doi request reprint Non-invasive determination of the absorption coefficient of the brain from time-resolved reflectance using a neural network
    Marion Jäger
    Institut für Lasertechnologien in der Medizin und Meßtechnik, Helmholtzstraße 12, 89081 Ulm, Germany
    Phys Med Biol 56:N139-44. 2011
    ..By applying the neural network to reflectance curves obtained from Monte Carlo simulations, similar errors were found...
  33. pmc Exact and efficient solution of the radiative transport equation for the semi-infinite medium
    Andre Liemert
    Institut für Lasertechnologien in der Medizin und Meßtechnik, Helmholtzstr 12, D 89081 Ulm, Germany
    Sci Rep 3:2018. 2013
    ..The obtained equations are verified with Monte Carlo simulations in the steady-state, temporal frequency, and time domains resulting in an excellent agreement...
  34. doi request reprint Light transport in three-dimensional semi-infinite scattering media
    Andre Liemert
    Institut für Lasertechnologien in der Medizin und Meßtechnik, Ulm, Germany
    J Opt Soc Am A Opt Image Sci Vis 29:1475-81. 2012
    ..The obtained solution is used for solving boundary-value problems, which are important for applications in the biomedical optics field. The derived equations are successfully verified by comparisons with Monte Carlo simulations...
  35. doi request reprint Thermal effects of white light illumination during microsurgery: clinical pilot study on the application safety of surgical microscopes
    Raimund Hibst
    Universitat Ulm, Institut fur Lasertechnologien in der Medizin und Messtechnik an der Universitat Ulm, Ulm, Germany
    J Biomed Opt 15:048003. 2010
    ....
  36. ncbi request reprint Non-invasive determination of muscle blood flow in the extremities from laser Doppler spectra
    A Kienle
    , Ulm, Germany
    Phys Med Biol 46:1231-44. 2001
    ....