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Functional imaging of cerebrovascular activities in small animals using high‐resolution photoacoustic tomography
Author(s) -
Yang Sihua,
Xing Da,
Zhou Quan,
Xiang Liangzhong,
Lao Yeqi
Publication year - 2007
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.2757088
Subject(s) - photoacoustic imaging in biomedicine , medical imaging , tomography , computed tomography , neuroimaging , medicine , nuclear medicine , radiology , high resolution , medical physics , photoacoustic tomography , biomedical engineering , optics , remote sensing , physics , geology , psychiatry
Photoacoustic imaging (PAI) is a noninvasive, nonionizing modality based on the differences in light absorption of various biological tissues. PAI utilizes the endogenous contrast characteristics of traditional optical imaging, while benefiting from high spatial resolution of the ultrasound imaging. A PAI system was developed to reconstruct the two‐dimensional cross section image and to visualize the cerebrovascular activities of mouse in vivo . The spatial resolution of the PAI system was determined to be 0.110 mm by a two‐point‐source phantom with the Rayleigh criterion. The potential applications of the system were clearly demonstrated by successfully mapping a traumatic lesion in the mouse brain cerebral cortex, by its ability to monitor physiological changes in the brain due to carotid ligation and drug stimulation, and two‐dimensional sliced images of a traumatic mouse brain at different depths were also provided. Our experimental results indicate that PAI has the potential for studying of traumatic brain injury and physiological functions of the brain.