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Optical properties of native and coagulated porcine liver tissue between 400 and 2400 nm
Author(s) -
Ritz JoergP.,
Roggan Andre,
Isbert Christoph,
Müller Gerhard,
Buhr Heinz J.,
Germer ChristophT.
Publication year - 2001
Publication title -
lasers in surgery and medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 112
eISSN - 1096-9101
pISSN - 0196-8092
DOI - 10.1002/lsm.1134
Subject(s) - liver tissue , penetration depth , laser , materials science , penetration (warfare) , wavelength , absorption (acoustics) , scattering , biomedical engineering , irradiation , optics , optoelectronics , medicine , composite material , physics , operations research , nuclear physics , engineering
Background and Objective Laser induced thermotherapy (LITT) is a promising treatment for irresectable liver tumors. For predicting the effects of laser applications and optimizing irradiation planning in LITT, knowledge about light distribution in tissue, optical tissue properties (absorption, scattering, anisotropy, penetration depth) and their changes due to thermal denaturation is indispensable. Study Design/Materials and Methods The optical parameters in healthy porcine liver were determined in the native state and after thermal coagulation using a double integrating sphere system in the wavelength range of 400–2400 nm. Results Optical parameters showed significant fluctuations in the examined wavelength range mainly due to the water and hemoglobin content in the tissue. The greatest optical penetration depth of 7.46 mm was achieved at 1070 nm. After thermal coagulation, a clear increase in scattering and a slight decrease in absorption was found, which results in a decreased optical penetration depth. Conclusions In order to ensure a safe and effective procedure, an adjustment of the laser power to the decreasing penetration depth is recommended during therapy. These results provide a better understanding of laser‐tissue interaction and may be helpful to investigators in the field of light dosimetry in liver tissue. Lasers Surg. Med. 29:205–212, 2001. © 2001 Wiley‐Liss, Inc.