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Proceedings Paper

Mapping tissue oxygen in vivo by photoacoustic lifetime imaging
Author(s): Qi Shao; Ekaterina Morgounova; Jeung-Hwan Choi; Chunlan Jiang; John Bischof; Shai Ashkenazi
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Paper Abstract

Oxygen plays a key role in the energy metabolism of living organisms. Any imbalance in the oxygen levels will affect the metabolic homeostasis and lead to pathophysiological diseases. Hypoxia, a status of low tissue oxygen, is a key factor in tumor biology as it is highly prominent in tumor tissues. However, clinical tools for assessing tissue oxygenation are limited. The gold standard is polarographic needle electrode which is invasive and not capable of mapping (imaging) the oxygen content in tissue. We applied the method of photoacoustic lifetime imaging (PALI) of oxygen-sensitive dye to small animal tissue hypoxia research. PALI is new technology for direct, non-invasive imaging of oxygen. The technique is based on mapping the oxygen-dependent transient optical absorption of Methylene Blue (MB) by pump-probe photoacoustic imaging. Our studies show the feasibility of imaging of dissolved oxygen distribution in phantoms. In vivo experiments demonstrate that the hypoxia region is consistent with the site of subcutaneously xenografted prostate tumor in mice with adequate spatial resolution and penetration depth.

Paper Details

Date Published: 4 March 2013
PDF: 7 pages
Proc. SPIE 8581, Photons Plus Ultrasound: Imaging and Sensing 2013, 85811S (4 March 2013); doi: 10.1117/12.2002839
Show Author Affiliations
Qi Shao, Univ. of Minnesota (United States)
Ekaterina Morgounova, Univ. of Minnesota (United States)
Jeung-Hwan Choi, Univ. of Minnesota (United States)
Chunlan Jiang, Univ. of Minnesota (United States)
John Bischof, Univ. of Minnesota (United States)
Shai Ashkenazi, Univ. of Minnesota (United States)

Published in SPIE Proceedings Vol. 8581:
Photons Plus Ultrasound: Imaging and Sensing 2013
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

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