1 November 2005 Measuring microlymphatic flow using fast video microscopy
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J. of Biomedical Optics, 10(6), 064016 (2005). doi:10.1117/1.2135791
Abstract
Despite advances in the measurement of lymphatic function, little is known about the actual velocities of flow in microlymphatic (~100 µm diam) vessels. In this work, video microscopy and particle tracking methods are adapted and integrated with an ultra-high-speed imaging camera to obtain measurements of lymph velocities throughout the entire lymphatic contraction cycle in the ratmesentery, something that previous systems were incapable of measuring. To determine the system's accuracy, calibration experiments are conducted across the hypothesized physiologically significant range of velocities for microlymphatic flow (up to 15 mm/sec). The system shows high accuracy, less than 2% error, when comparing actual with measured velocities. Microspheres flowing through 140-µm-diam tubing are imaged to demonstrate the system's ability to determine flow rates in these small vessels by measuring particle velocities. To demonstrate biological applicability, mesenteric microlymphatics in loops of the small intestine of three male Sprague-Dawley rats are exteriorized and imaged with the high-speed system at a rate of 500 frames/sec for several contraction sequences. Lymph velocity fluctuates cyclically with the vessel wall contractions, ranging from –1 to 7 mm/sec. These rates are higher than would be possible with standard video microscopy (3.75 mm/sec maximum).
J. Brandon Dixon, David C. Zawieja, Anatoliy A. Gashev, Gerard Lawrence Coté, "Measuring microlymphatic flow using fast video microscopy," Journal of Biomedical Optics 10(6), 064016 (1 November 2005). http://dx.doi.org/10.1117/1.2135791
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KEYWORDS
Lymphatic system

Velocity measurements

Particles

Cameras

Video microscopy

Calibration

Imaging systems

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