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Proceedings Paper

Effect of apertures in ultrasound-modulated optical tomography with photomultiplier tube
Author(s): Lili Zhu; Shubing Ran; Zhiyuan Lin; Hui Li
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Paper Abstract

Improving signal to noise ratio in ultrasound-modulated optical tomography (UOT) is a research topic. Laying apertures in front of a photomultiplier tube (PMT) can reduce the ambient noise collected by the PMT, and efficiently improve the signal to noise ratio of UOT. In addition, the effective area of detection and the off-axis position of the PMT would be varied by changing the aperture size and position in front of the PMT. Experimental results indicated that ultrasound-modulated signal is dependent on the area of detection. The greater the detector area, the smaller the ultrasound-modulated signal and its modulation depth. The modulated signal also depended on the off-axis position of the PMT from the optic axis. In particular, the modulated signal did not reach the biggest value when the PMT just placed on the optics axis. Choosing appropriate size, position of aperture, can improve the signal to noise ratio and image contrast.

Paper Details

Date Published: 11 December 2012
PDF: 8 pages
Proc. SPIE 8553, Optics in Health Care and Biomedical Optics V, 85532P (11 December 2012); doi: 10.1117/12.999559
Show Author Affiliations
Lili Zhu, Fujian Normal Univ. (China)
Shubing Ran, Fujian Normal Univ. (China)
Zhiyuan Lin, Fujian Normal Univ. (China)
Hui Li, Fujian Normal Univ. (China)

Published in SPIE Proceedings Vol. 8553:
Optics in Health Care and Biomedical Optics V
Qingming Luo; Ying Gu; Xingde D. Li, Editor(s)

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