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Diffuse and nonlinear imaging of multiscale vascular parameters for in vivo monitoring of preclinical mammary tumors.
Journal of Biophotonics 2019 January 32
Diffuse Optical Imaging (DOI) techniques provide a wide-field or macro assessment of the functional tumor state, and have shown substantial promise for monitoring treatment efficacy in cancer. Conversely, intravital microscopy provides a high-resolution view of the tumor state, and has played a key role in characterizing treatment response in the preclinical setting. There has been little prior work in investigating how the macro and micro spatial scales can be combined to develop a more comprehensive and translational view of treatment response. To address this, a new multiscale preclinical imaging technique called Diffuse and Nonlinear Imaging (DNI) was developed. DNI combines Multiphoton Microscopy (MPM) with Spatial Frequency Domain Imaging (SFDI) to provide multiscale data sets of tumor microvascular architecture coregistered within wide-field hemodynamic maps. A novel method was developed to match the imaging depths of both modalities by utilizing informed SFDI spatial frequency selection. An in vivo DNI study of murine mammary tumors revealed multiscale relationships between tumor oxygen saturation and microvessel diameter, and tumor oxygen saturation and microvessel length (|Pearson's ρ| ≥ 0.5, p < 0.05). Going forward, DNI will be uniquely enabling for the investigation of multiscale relationships in tumors during treatment. This article is protected by copyright. All rights reserved.
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