Applicability of quantitative optical imaging techniques for intraoperative perfusion diagnostics: a comparison of laser speckle contrast imaging, sidestream dark-field microscopy, and optical coherence tomography

作者：Jansen Sanne M^*; de Bruin Daniel M; Faber Dirk J; Dobbe Iwan J G G; Heeg Erik; Milstein Dan M J; Strackee Simon D; van Leeuwen Ton G

来源：Journal of Biomedical Optics, 2017, 22(8): 086004.

DOI：10.1117/1.JBO.22.8.086004

• biomedical optical imaging
• medical diagnostics imaging
• perfusion
• phantom
• laser speckle contrast imaging
• optical coherence tomography
• sidestream dark-field microscopy

Patient morbidity and mortality due to hemodynamic complications are a major problem in surgery. Optical techniques can image blood flow in real-time and high-resolution, thereby enabling perfusion monitoring intraoperatively. We tested the feasibility and validity of laser speckle contrast imaging (LSCI), optical coherence tomography (OCT), and sidestream dark-field microscopy (SDF) for perfusion diagnostics in a phantom model using whole blood. Microvessels with diameters of 50, 100, and 400 mu m were constructed in a scattering phantom. Perfusion was simulated by pumping heparinized human whole blood at five velocities (0 to 20 mm/s). Vessel diameter and blood flow velocity were assessed with LSCI, OCT, and SDF. Quantification of vessel diameter was feasible with OCT and SDF. LSCI could only visualize the 400-mu m vessel, perfusion units scaled nonlinearly with blood velocity. OCT could assess blood flow velocity in terms of inverse OCT speckle decorrelation time. SDF was not feasible to measure blood flow; however, for diluted blood the measurements were linear with the input velocity up to 1 mm/s. LSCI, OCT, and SDF were feasible to visualize blood flow. Validated blood flow velocity measurements intraoperatively in the desired parameter (mL.min(-1).g(-1)) remain challenging.

• 出版日期2017-8