Sökning: WFRF:(Nilsson Stefan K.)
> (1995-1999) >
T-matrix computatio...
-
Nilsson, Annika M. K.
(författare)
T-matrix computations of light scattering by red blood cells
- Artikel/kapitelEngelska1998
Förlag, utgivningsår, omfång ...
Nummerbeteckningar
-
LIBRIS-ID:oai:lup.lub.lu.se:d9c4345b-e4d6-444a-9443-70b5282577ac
-
https://lup.lub.lu.se/record/d9c4345b-e4d6-444a-9443-70b5282577acURI
Kompletterande språkuppgifter
-
Språk:engelska
-
Sammanfattning på:engelska
Ingår i deldatabas
Klassifikation
-
Ämneskategori:art swepub-publicationtype
-
Ämneskategori:ref swepub-contenttype
Anmärkningar
-
The electromagnetic far field, as well as the near field, originating from light interaction with a red blood cell ~RBC! volume-equivalent spheroid, was analyzed by utilizing the T-matrix theory. This method is a powerful tool that makes it possible to study the influence of cell shape on the angular distribution ofscattered light. General observations were that the three-dimensional shape, as well as the optical thickness apparent to the incident field, affects the forward scattering. The backscattering was influenced by the shape of the surface facing the incident beam. Furthermore sphering as well as elongation of an oblate RBC into a volume-equivalent sphere or a prolate spheroid, respectively, was theoretically modeled to imitate physiological phenomena caused, e.g., by heat or the increased shear stress of flowing blood. Both sphering and elongation were shown to decrease the intensity of the forward-directed scattering, thus yielding lower g factors. The sphering made the scattering pattern independent ofazimuthal scattering angle fs, whereas the elongation induced more apparent fs-dependent patterns. The light scattering by a RBC volume-equivalent spheroid was thus found to be highly influenced by the shape of the scattering object. A near-field radius rnf was evaluated as the distance to which the maximum intensity of the total near field had decreased to 2.5 times that of the incident field. It was estimated to 2–24.5 times the maximum radius of the scattering spheroid, corresponding to 12–69 mm. Because the near-field radius was shown to be larger than a simple estimation of the distance between the RBC’s in whole blood, the assumption of independent scattering, frequently employed in opticalmeasurements on whole blood, seems inappropriate. This also indicates that one cannot extrapolate the results obtained from diluted blood to whole blood by multiplying with a simple concentration factor.
Biuppslag (personer, institutioner, konferenser, titlar ...)
-
Alsholm, Peter
(författare)
-
Karlsson, Anders
(författare)
-
Andersson-Engels, StefanLund University,Lunds universitet,Medicinskt lasercentrum,Annan verksamhet, LTH,Lunds Tekniska Högskola,Atomfysik,Fysiska institutionen,Institutioner vid LTH,Lund University Medical Laser Centre,Other operations, LTH,Faculty of Engineering, LTH,Atomic Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)fysi-san
(författare)
-
Medicinskt lasercentrumAnnan verksamhet, LTH
(creator_code:org_t)
Sammanhörande titlar
-
Ingår i:Applied Optics37:13, s. 2735-27481559-128X
Internetlänk
Hitta via bibliotek
Till lärosätets databas