Blood flow dynamics after laser therapy of port wine stain birthmarks

Yu-Chih Huang; Nadia Tran; E. Victor Ross; Peter R. Shumaker; J. Stuart Nelson; Kristen Kelly; Bernard Choi

doi:10.1117/12.811061

23 February 2009 Blood flow dynamics after laser therapy of port wine stain birthmarks

Yu-Chih Huang, Nadia Tran, E. Victor Ross, Peter R. Shumaker, J. Stuart Nelson, Kristen Kelly, Bernard Choi

Proceedings Volume 7161, Photonic Therapeutics and Diagnostics V; 71610V (2009) https://doi.org/10.1117/12.811061
Event: SPIE BiOS, 2009, San Jose, California, United States

Abstract

During laser therapy of port wine stain (PWS) birthmarks, regions of persistent perfusion may exist. We hypothesize that such regions, which are not readily visible, exist even during laser surgery performed by highly experienced clinicians. The objective of this study was to use objective feedback to assess the acute vascular response to laser therapy. We have developed a clinic-friendly laser speckle imaging (LSI) instrument to provide the clinician with real-time images of blood flow during laser therapy. We acquired images from patients undergoing laser therapy of PWS birthmarks at Scripps Clinic and Beckman Laser Institute and Medical Clinic. We extracted blood flow maps from the acquired imaging data. Collectively, we have observed two regimes of patient response to therapy: 1) an immediate increase in perfusion within minutes after laser therapy; and 2) an overall decrease in blood perfusion approximately one hour after laser therapy, with distinct regions of persistent perfusion apparent in the majority of post-treatment blood-flow images. A comparison of blood flow in PWS and adjacent normal skin demonstrated that PWS blood flow can be greater than or sometimes equivalent to that of normal skin. Regions of persistent perfusion frequently exist immediately after laser therapy of PWS birthmarks. Existence of these regions may be correlated to the need for multiple treatment sessions to improve substantially PWS skin appearance. With the use of intraoperative LSI, immediate retreatment of these regions may improve the outcome of each session.

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Yu-Chih Huang, Nadia Tran, E. Victor Ross, Peter R. Shumaker, J. Stuart Nelson, Kristen Kelly, and Bernard Choi "Blood flow dynamics after laser therapy of port wine stain birthmarks", Proc. SPIE 7161, Photonic Therapeutics and Diagnostics V, 71610V (23 February 2009); https://doi.org/10.1117/12.811061

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KEYWORDS

Laser therapeutics

Blood

Blood circulation

Skin

Speckle

Alexandrite lasers

Laser coagulation

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