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Absorption of diode 810 nm used for transpupillary thermotherapy by blood. An in vitro study
Author(s) -
Morales Ana Muñoz,
Lapuente Carlos Ruiz,
Peyman Gholam A.,
Kivilcim Muhamet
Publication year - 2006
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.20330
Subject(s) - laser , diode , materials science , absorption (acoustics) , optics , attenuation , biomedical engineering , laser diode , medicine , optoelectronics , physics , composite material
Background and Objectives To evaluate the in vitro energy attenuation by transpupillary thermotherapy (TTT) using an 810‐nm diode laser after the treatment of exudative age‐related macular degeneration. Study Design/Materials and Methods In this experiment, an 810‐nm diode laser was coupled to a slit lamp to deliver laser energy to a laser‐power sensor adjusted in the track of the laser light. The spotlight was 0.5 mm in diameter; duration of exposure, 3 seconds. Citrated Pasteur pipettes were filled with blood diluted in saline in several concentrations and placed in the path of the laser light. The absorption of the light measured by the power sensor was tested for various delivered irradiances between 50.92 and 509.29 W/cm 2 . The differences were analyzed statistically. Results There were significant differences in laser blockage comparing various conditions for all power levels ( P <0.05). Increasing the proportion of blood resulted in more laser blockage with all irradiances ( P <0.05). Conclusions Blood significantly blocks the transmission of the 810‐nm diode TTT laser. Lasers Surg. Med. 38:643–646, 2006. © 2006 Wiley‐Liss, Inc.