Comparison of Indocyanine Green Angiography and Laser Speckle Contrast Imaging for the Assessment of Vasculature Perfusion.

Citation:

E. L. Towle, Richards, L. M., {Shams Kazmi}, S., Fox, D. J., and Dunn, A. K., “Comparison of Indocyanine Green Angiography and Laser Speckle Contrast Imaging for the Assessment of Vasculature Perfusion.,” Neurosurgery, 2012.

Abstract:

BACKGROUND:: Assessment of the vasculature is critical for overall success in cranial vascular neurological surgery procedures. While several methods of monitoring cortical perfusion intraoperatively are available, not all are appropriate or convenient in a surgical environment. Recently, two optical methods of care have emerged that are able to obtain high spatial resolution images with easily implemented instrumentation: indocyanine green (ICG) angiography and laser speckle contrast imaging (LSCI). OBJECTIVE:: To evaluate the usefulness of ICG and LSCI in measuring vessel perfusion. METHODS:: An experimental setup was developed that simultaneously collects measurements of ICG fluorescence and LSCI in a rodent model. A 785nm laser diode was used for both excitation of the ICG dye and the LSCI illumination. A photothrombotic clot model was used to occlude specific vessels within the field of view to enable comparison of the two methods for monitoring vessel perfusion. RESULTS:: The induced blood flow change demonstrated that ICG is an excellent method for visualizing the volume and type of vessel at a single point in time; however, it is not always an accurate representation of blood flow. In contrast, LSCI provides a continuous and accurate measurement of blood flow changes without the need of an external contrast agent. CONCLUSION:: These two methods should be used together in order to obtain a complete understanding of tissue perfusion.

Notes:

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