Open AccessSpatial effect of conical angle on optical-thermal distribution for circumferential photocoagulation
Author(s) -
Van Gia Truong,
Suhyun Park,
Vân Nam Tran,
Hyun Wook Kang
Publication year - 2017
Publication title -
biomedical optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.362
H-Index - 86
ISSN - 2156-7085
DOI - 10.1364/boe.8.005663
Subject(s) - materials science , conical surface , optics , diffuser (optics) , photothermal therapy , light intensity , laser , goniometer , ligand cone angle , intensity (physics) , light source , composite material , nanotechnology , physics
A uniformly diffusing applicator can be advantageous for laser treatment of tubular tissue. The current study investigated various conical angles for diffuser tips as a critical factor for achieving radially uniform light emission. A customized goniometer was employed to characterize the spatial uniformity of the light propagation. An ex vivo model was developed to quantitatively compare the temperature development and irreversible tissue coagulation. The 10-mm diffuser tip with angle at 25° achieved a uniform longitudinal intensity profile (i.e., 0.90 ± 0.07) as well as a consistent thermal denaturation on the tissue. The proposed conical angle can be instrumental in determining the uniformity of light distribution for the photothermal treatment of tubular tissue.