Document Detail


Choroidal laser Doppler flowmeter with enhanced sensitivity based on a scattering plate.
MedLine Citation:
PMID:  21529094     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
A portable choroidal laser Doppler flowmeter (LDF) with enhanced sensitivity based on a scattering plate is developed. The portable LDF is weighted 2 kg operated at center wavelength of 780 nm, leading to a better penetration into the eye fundus in contrast to the previous LDF operated at center wavelength of 670 nm. Enhancement of number of detected photons that undergo Doppler scattering and improved measured speed of choroidal blood flow are achieved with the use of a scattering plate positioned in front of the eye. The mechanism of detection and sensitivity enhancement is theoretically analyzed. Evaluation of system performance is done by in vivo measurements on ten volunteers. The results demonstrate that an increased percentage of backscattering light at high Doppler shift frequency is collected due to utilization of the scattering plate. However, this kind of light detection influences spatial resolution of the system and decreases the total signal measured. The proposed method for detection and sensitivity enhancement might be useful in a case where the perception of very slight alternation of blood flow is pursued and the spatial resolution is not as critical as that in a choroidal vascular bed.
Authors:
Chuan Wang; Zhihua Ding; Martial Geiser; Tong Wu; Minghui Chen
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of biomedical optics     Volume:  16     ISSN:  1560-2281     ISO Abbreviation:  J Biomed Opt     Publication Date:  2011 Apr 
Date Detail:
Created Date:  2011-05-02     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9605853     Medline TA:  J Biomed Opt     Country:  United States    
Other Details:
Languages:  eng     Pagination:  047004     Citation Subset:  IM    
Affiliation:
Zhejiang University, State Key Lab of Modern Optical Instrumentation, Yuquan Campus, 38 Zheda Road, Hangzhou 310027, ChinaHaute Ecole Valaisanne, Rue du Rawyl 47, 1950 Sion, Switzerland.
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