We report on experimental demonstration of focused photoacoustic (PA) imaging for simultaneous recovery of the
acoustic and optical properties of absorber in homogeneous media. The PA signals are reconstructed from tissue-like
phantom experiments using Hilbert transform (HT) algorithm coupled with a focused PA imaging system. The results
demonstrate that the HT-based PA signal occurs at the edge of heterogeneous sample. The average acoustic velocity
could be obtained by the size dividing the traveling time. In addition, the absorption coefficient of absorber could be
reconstructed by the intensity of the HT-based PA signal at the edge of sample based on the theoretical analysis.
The photoacoustic (PA) signal attenuation was affected by many factors in an imaging system. In this presentation, the
factors lead to the signal attenuation and their characters were discussed based on tissue optics, acoustic transportation
and detection in a long-focal-zone PA imaging system. A method to recover the detected PA signals was presented and
employed to image a thyroid sample in vitro. The experimental results demonstrated that the method could be used to
improve the imaging depth and quality in the PA system.
Photoacoustic imaging is a promising technique in practical medicine to image biological tissue's function and diagnose
internal organs. In this paper, a new photoacoustic imaging modality for imaging internal organs was presented. A laser
which wavelength is tunable was coupled into a multimode optical fiber. And the fiber was inserted into the inner tract of
the samples to deliver light for exciting photoacoustic signals. The outgoing PA signal was detected by a focal ultrasound
transducer with long focal length which was placed on the surface of the samples. By transducer scanning, we obtained a
2D cross-section photoacoustic image. Finally, we evaluate this system's performance and demonstrate its capabilities by
imaging phantoms with complex structure.
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