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Published September 16, 2009 | Published
Journal Article Open

Photoacoustic tomography of small animal brain with a curved array transducer


We present the application of a curved array photoacoustic tomographic imaging system that can provide rapid, high-resolution photoacoustic imaging of small animal brains. The system is optimized to produce a B-mode, 90-deg field-of-view image at sub-200-μm resolution at a frame rate of ∼1frame∕second when a 10-Hz pulse repetition rate laser is employed. By rotating samples, a complete 360-deg scan can be achieved within 15s. In previous work, two-dimensional (2-D) ex vivo mouse brain cortex imaging has been reported. We report three-dimensional (3-D) small animal brain imaging obtained with the curved array system. The results are presented as a series of 2-D cross-sectional images. Besides structural imaging, the blood oxygen saturation of the animal brain cortex is also measured in vivo. In addition, the system can measure the time-resolved relative changes in blood oxygen saturation level in the small animal brain cortex. Last, ultrasonic gel coupling, instead of the previously adopted water coupling, is conveniently used in near-real-time 2-D imaging.

Additional Information

© 2009 SPIE. Paper 08423R received Dec. 2, 2008; revised manuscript received Jun. 26, 2009; accepted for publication Jul. 14, 2009; published online Sep. 16, 2009. We thank Song Hu for helpful discussion on SO_2 calculation. This project was sponsored in part by the National Institutes of Health, Grant Nos. R01 NS46214 (BRP) and R01 EB000712.

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