OBJECTIVE: The goal of this study is to determine the optical properties of different rat tissues with respect to spatial intensity variation and light distribution. We are interested mainly in the wavelength of 630 nm. Nevertheless, for liver tissue we have used 514 nm and 670 nm as well. BACKGROUND DATA: In the past, many articles have been written about the interaction of lasers with rat tissues. However, the technique of imaging the light distribution allows us to obtain the spatial scattering as well as an effective attenuation coefficient for the light intensity. METHODS: Slices of different rat tissues were placed between two microscope slide mounts (spaced by 3 mm). A laser beam was irradiated on the sandwiched tissue. A CCD camera placed on the side, orthogonal to the beam path, recorded the intensity distribution of the scattered light. Analysis of this spatial intensity profile allowed determining the variation of the intensity as the light penetrates the tissue. RESULTS: We have found that abdominal wall fat presents the lowest exponential decay when compared with liver, muscle, and kidney. The obtained values provided good data about the light distribution in those tissues when irradiated with a nondiffuse laser beam. For all tissues, we observed a spherical light distribution and exponential decay. Cirrhotic liver shows much stronger decay than healthy liver. These results are useful for several applications of laser for biostimulation a phototherapy.
OBJECTIVE: The goal of this study is to determine the optical properties of different rat tissues with respect to spatial intensity variation and light distribution. We are interested mainly in the wavelength of 630 nm. Nevertheless, for liver tissue we have used 514 nm and 670 nm as well. BACKGROUND DATA: In the past, many articles have been written about the interaction of lasers with rat tissues. However, the technique of imaging the light distribution allows us to obtain the spatial scattering as well as an effective attenuation coefficient for the light intensity. METHODS: Slices of different rat tissues were placed between two microscope slide mounts (spaced by 3 mm). A laser beam was irradiated on the sandwiched tissue. A CCD camera placed on the side, orthogonal to the beam path, recorded the intensity distribution of the scattered light. Analysis of this spatial intensity profile allowed determining the variation of the intensity as the light penetrates the tissue. RESULTS: We have found that abdominal wall fat presents the lowest exponential decay when compared with liver, muscle, and kidney. The obtained values provided good data about the light distribution in those tissues when irradiated with a nondiffuse laser beam. For all tissues, we observed a spherical light distribution and exponential decay. Cirrhotic liver shows much stronger decay than healthy liver. These results are useful for several applications of laser for biostimulation a phototherapy.
Authors: Helen Reinhart Camargo Catarino; Natália Pereira de Godoy; Nayara Kastem Scharlack; Lia Mara Grosso Neves; Fernanda Oliveira de Gaspari de Gaspi; Marcelo Augusto Marreto Esquisatto; Maria Esméria Corezola do Amaral; Fernanda Aparecida Sampaio Mendonça; Gláucia Maria Tech dos Santos Journal: Lasers Med Sci Date: 2015-01-20 Impact factor: 3.161
Authors: Sonja Johannsmeier; Johannes Wenzel; Maria L Torres-Mapa; Sebastian Junge; Philipp Sasse; Joshua D Stockhausen; Tammo Ripken; Dag Heinemann; Alexander Heisterkamp Journal: Biomed Opt Express Date: 2020-10-19 Impact factor: 3.732
Authors: Mirian D Stringasci; Thereza C Fortunato; Lilian T Moriyama; José Dirceu Vollet Filho; Vanderlei S Bagnato; Cristina Kurachi Journal: Lasers Med Sci Date: 2017-05-05 Impact factor: 3.161
Authors: Gustavo B Melo; Renata L Silva; Valdinaldo A Melo; Sônia O Lima; Angelo R Antoniolli; Tiago Castro-E-silva; Luis G Marcassa; Vanderlei S Bagnato; Sérgio Zucoloto; Leandra N Z Ramalho; Fernando S Ramalho; Orlando Castro-E-silva Journal: Dig Dis Sci Date: 2005-05 Impact factor: 3.199
Authors: Luís Fernando Tirapelli; Beatriz F M Trazzi; Vanderlei S Bagnato; Daniela P C Tirapelli; Cristina Kurachi; Mardoqueu Martins da Costa; Silvio Tucci; Adauto J Cologna; Antonio C P Martins Journal: Lasers Med Sci Date: 2008-06-26 Impact factor: 3.161