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Comparison of ALA PDT response in vivo using LED device and a laser source. (a) Comparison of volume 10 days after PDT treatment with each light source. Both light sources produce effective tumor response. The difference in response for LED and laser groups is not statistically significant (P > 0.05) at either time point. (b) The extent of PpIX photobleaching (ratio of post-PDT to pre-PDT fluorescence) is approximately the same for both light sources.
