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J Biophotonics. 2019 Jul 9:e201900086. doi: 10.1002/jbio.201900086. [Epub ahead of print]

Imaging depth variations in hyperspectral imaging: Development of a method to detect tumor up to the required tumor-free margin width.

Author information

1
Department of Surgery, Netherlands Cancer Institute, Amsterdam, the Netherlands.
2
Department of Biomedical Engineering and Physics, Amsterdam University Medical Center, Amsterdam, Netherlands.
3
Department of Pathology, the Netherlands Cancer Institute, Amsterdam, Netherlands.
4
Department of Pathology, Ghent University Hospital, Ghent, Belgium.
5
Department of Epidemiology and Biostatistics, the Netherlands Cancer Institute, Amsterdam, Netherlands.
6
Faculty of Science and Technology, University of Twente, Enschede, Netherlands.

Abstract

Hyperspectral imaging is a promising technique for resection margin assessment during cancer surgery. Thereby, only a specific amount of the tissue below the resection surface, the clinically defined margin width, should be assessed. Since the imaging depth of hyperspectral imaging varies with wavelength and tissue composition, this can have consequences for the clinical use of hyperspectral imaging as margin assessment technique. In this study, a method was developed that allows for hyperspectral analysis of resection margins in breast cancer. This method uses the spectral slope of the diffuse reflectance spectrum at wavelength regions where the imaging depth in tumor and healthy tissue is equal. Thereby, tumor can be discriminated from healthy breast tissue while imaging up to a similar depth as the required tumor-free margin width of 2 mm. Applying this method to hyperspectral images acquired during surgery would allow for robust margin assessment of resected specimens. In this paper, we focused on breast cancer, but the same approach can be applied to develop a method for other types of cancer.

KEYWORDS:

breast-conserving surgery; diffuse reflectance; hyperspectral imaging depth; penetration depth; resection margin assessment; resection margin width

PMID:
31290280
DOI:
10.1002/jbio.201900086

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