Spatial effect of conical angle on optical-thermal distribution for circumferential photocoagulation

Van Gia Truong, Suhyun Park, Van Nam Tran, Hyun Wook Kang

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


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.

Original languageEnglish
Article number#304251
Pages (from-to)5663-5674
Number of pages12
JournalBiomedical Optics Express
Issue number12
StatePublished - 1 Dec 2017

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Publisher Copyright:
© 2017 Optical Society of America.


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