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Journal of Biomedical Optics

Optical-sectioning microscopy of protoporphyrin IX fluorescence in human gliomas: standardization and quantitative comparison with histology
Author(s): Linpeng Wei; Ye Chen; Chengbo Yin; Sabine Borwege; Nader Sanai; Jonathan T. C. Liu
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Paper 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.

Paper Details

Date Published: 13 April 2017
PDF: 7 pages
J. Biomed. Opt. 22(4) 046005 doi: 10.1117/1.JBO.22.4.046005
Published in: Journal of Biomedical Optics Volume 22, Issue 4
Show Author Affiliations
Linpeng Wei, Univ. of Washington (United States)
Ye Chen, Univ. of Washington (United States)
Chengbo Yin, Univ. of Washington (United States)
Sabine Borwege, Barrow Neurological Institute (United States)
Nader Sanai, Barrow Neurological Institute (United States)
Jonathan T. C. Liu, Univ. of Washington (United States)

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