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Journal of Biomedical Optics • Open Access

Choroidal laser Doppler flowmeter with enhanced sensitivity based on a scattering plate
Author(s): Chuan Wang; Zhihua Ding; Tong Wu; Minghui Chen; Martial H. Geiser

Paper Abstract

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.

Paper Details

Date Published: 1 April 2011
PDF: 8 pages
J. Biomed. Opt. 16(4) 047004 doi: 10.1117/1.3565438
Published in: Journal of Biomedical Optics Volume 16, Issue 4
Show Author Affiliations
Chuan Wang, Zhejiang Univ. (China)
Zhihua Ding, Zhejiang Univ. (China)
Tong Wu, Zhejiang Univ. (China)
Minghui Chen, Zhejiang Univ. (China)
Martial H. Geiser, HES-SO Valais (Switzerland)

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