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. 2019 Jul 16;6:41. doi: 10.3389/fsurg.2019.00041

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Copyright © 2019 Reinert, Piffaretti, Wilzbach, Hauger, Guckler, Marchi and D'Angelo.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Quantitative PpIX measurement. Comparison of two different methods able to quantitatively measure the accumulated PpIX in tissue biopsy. (A) Shows quantitative measurement performed with the Qp9 Zeiss microscope whereas (B) shows results obtained after methanolic-perchloric acid extraction from the whole biopsy.