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Proceedings Paper

Discrimination between orientation and elongation of RBC in laminar flow by means of laser diffraction
Author(s): Rainer Bayer; Serdar Caglayan; Bernd Guenther
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Paper Abstract

The elongation curve of RBC as determined by rheoscopy or ektacytometry (laser diffraction) resembles a rectangular hyperbola. The experimental data obtained so far included too large errors of measurement to allow precise mathematical description. The combination of laser diffraction with image analysis has improved ektacytometry considerably, such that the error of measurement is reduced to less than 0.5%. In laminar flow RBC of healthy donors are elongated elliptically (p <EQ 0.001). Using the precise data of elliptical deformation, the elongation curve can be described to be hyperbolic. Hence, the double reciprocal plot gives a linear curve which -- over a wide range of shear stress (15 to 500 dyn/cm2) -- fits well the experimental data (r >= 0.99: p <EQ 0.001). The stress strain characteristics (i.e. elongation curve) can be described by two parameters: maximum elongation (Emax) and the shear stress needed for half-maximum elongation (KE).

Paper Details

Date Published: 21 July 1994
PDF: 9 pages
Proc. SPIE 2136, Biochemical Diagnostic Instrumentation, (21 July 1994); doi: 10.1117/12.180777
Show Author Affiliations
Rainer Bayer, Heinrich-Heine-Univ. (Germany)
Serdar Caglayan, Heinrich-Heine-Univ. (Germany)
Bernd Guenther, Heinrich-Heine-Univ. (Germany)


Published in SPIE Proceedings Vol. 2136:
Biochemical Diagnostic Instrumentation
Robert F. Bonner; Gerald E. Cohn; Thomas M. Laue; Alexander V. Priezzhev, Editor(s)

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