Title :
Visualization of blood flow using laser speckle method
Author :
Fujii, Hitoshi ; Konishi, Naoki
Author_Institution :
Dept. of Comput. Sci. & Electron., Kyushu Inst. of Technol., Iizuka, Japan
fDate :
31 Oct-3 Nov 1996
Abstract :
Two versions of the Laser Flowgraphy system are presented in this paper-one version analyzes the bloodstream of the human retina and the other version visualizes the microcirculation map of skin tissue and the gums. The retina is illuminated with a diode laser spot through a retinal camera and the speckle field at the image plane of the spot is scanned by an area sensor. A hardware logic circuit board is used to evaluate the average derivative (AD) or square blur rate (SBR) of the intensity variation at each pixel point. The results are displayed successively on 2-D color maps at a rate of 16 frames/second which allows real-time observation of retinal blood flow. Similarly, the blood flow of the gum is analyzed by scanning the laser line spot across the gum tissue and the spot is imaged onto the line sensor. The blood flow map is obtained for the region of 50×50 mm in a few seconds with 200×200 resolution
Keywords :
biomedical imaging; blood flow measurement; eye; flow visualisation; laser applications in medicine; skin; speckle; 2-D color maps; average derivative; blood flow visualization; bloodstream; diode laser spot; gums; hardware logic circuit board; human retina; image plane; intensity variation; laser flowgraphy system; laser speckle method; line sensor; microcirculation map; pixel point; real-time observation; retinal camera; skin tissue; speckle field; square blur rate; Blood flow; Cameras; Diode lasers; Hardware; Humans; Image sensors; Retina; Skin; Speckle; Visualization;
Conference_Titel :
Engineering in Medicine and Biology Society, 1996. Bridging Disciplines for Biomedicine. Proceedings of the 18th Annual International Conference of the IEEE
Conference_Location :
Amsterdam
Print_ISBN :
0-7803-3811-1
DOI :
10.1109/IEMBS.1996.656914
