Monte Carlo modelling of daylight activated photodynamic therapy
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The treatment of super cial skin lesions via daylight activated photodynamic therapy (PDT) has been explored theoretically with three dimensional (3D) Monte Carlo radiation transfer (MCRT) simulations. For similar parameters and conditions, daylight activated PDT was compared to conventional PDT using a commercially available light source. Under reasonable assumptions for the optical properties of the tissue, protoporphyrin IX (PpIX) concentration, and a treatment dose of 75 J cm-2, it was found that during a clear summer day an effective treatment depth of over 2 mm can be achieved after 30 min of daylight illumination at a latitude of 56 degrees North. The same light dose would require 2.5 h of daylight illumination during an overcast summer day where a treatment depth of about 2 mm can be achieved. For conventional PDT the developed model suggests that 15 min of illumination is required to deliver a light dose of 75 J cm-2, which would result in an e effective treatment depth of about 3 mm. The model developed here allows for the determination of phototoxicity in skin tissue as a function of depth for different weather conditions as well as for conventional light sources. Our theoretical investigation supports clinical studies and shows that daylight activated PDT has the potential for treating superficial skin lesions during different weather conditions.
Campbell , C L , Wood , K , Valentine , R M , Brown , C T A & Moseley , H 2015 , ' Monte Carlo modelling of daylight activated photodynamic therapy ' Physics in Medicine and Biology , vol 60 , no. 10 . DOI: 10.1088/0031-9155/60/10/4059
Physics in Medicine and Biology
© 2015 Institute of Physics and Engineering in Medicine. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at http://dx.doi.org/10.1088/0031-9155/60/10/4059
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