13 April 2017 Optical-sectioning microscopy of protoporphyrin IX fluorescence in human gliomas: standardization and quantitative comparison with histology
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Abstract
Systemic delivery of 5-aminolevulinic acid leads to enhanced fluorescence image contrast in many tumors due to the increased accumulation of protoporphyrin IX (PpIX), a fluorescent porphyrin that is associated with tumor burden and proliferation. The value of PpIX-guided resection of malignant gliomas has been demonstrated in prospective randomized clinical studies in which a twofold greater extent of resection and improved progression-free survival have been observed. In low-grade gliomas and at the diffuse infiltrative margins of all gliomas, PpIX fluorescence is often too weak to be detected with current low-resolution surgical microscopes that are used in operating rooms. However, it has been demonstrated that high-resolution optical-sectioning microscopes are capable of detecting the sparse and punctate accumulations of PpIX that are undetectable via conventional low-power surgical fluorescence microscopes. To standardize the performance of high-resolution optical-sectioning devices for future clinical use, we have developed an imaging phantom and methods to ensure that the imaging of PpIX-expressing brain tissues can be performed reproducibly. Ex vivo imaging studies with a dual-axis confocal microscope demonstrate that these methods enable the acquisition of images from unsectioned human brain tissues that quantitatively and consistently correlate with images of histologically processed tissue sections.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Linpeng Wei, Linpeng Wei, Ye Chen, Ye Chen, Chengbo Yin, Chengbo Yin, Sabine Borwege, Sabine Borwege, Nader Sanai, Nader Sanai, Jonathan T. C. Liu, Jonathan T. C. Liu, } "Optical-sectioning microscopy of protoporphyrin IX fluorescence in human gliomas: standardization and quantitative comparison with histology," Journal of Biomedical Optics 22(4), 046005 (13 April 2017). https://doi.org/10.1117/1.JBO.22.4.046005 . Submission: Received: 29 November 2016; Accepted: 27 March 2017
Received: 29 November 2016; Accepted: 27 March 2017; Published: 13 April 2017
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