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A prototype of photoacoustic standard CT(PSCT) has been designed for high resolution quasi-3D photoacoustic tomography with a focused digital phased array transducer. To realize photoacoustic computed tomography, each element of the transducer array possess a thin cylinder ultrasonic lens to select 2D image plane and suppress the out-of-plane signals. The modified LFBP algorithm is utilized to reconstruct...
Detection of negative kidney calculus is difficult using X-ray imaging. This article shows that thermoacoustic imaging as a novel and complementary medical modality may become a fast and effective method for detecting negative kidney calculus.
In this paper, a new photoacoustic imaging system based on multi-element linear transducer array CT-scanning was present. In this imaging system, the 532-nm laser light with the repetition rate of 10 Hz and the pulse width of 10 ns used as the excitation source. A 64-element linear transducer array with the central frequency of 7.5 MHz is used to capture photoacoustic signals by rotating the multi-element...
A photoacoustic tomography system is developed by using a double-ring sensor featuring a narrow angular aperture. An angular aperture of 2.0 degree can be obtained with this sensor, which improves the spatial resolution of the sensor in scanning direction. In this sensor a fiber for illumination of the sample is integrated, which enables reflection-mode detection of ultrasonic waves. These give the...
Gold nanoshell was used as a new contrast-enhancing agent for photoacoustic tomography. Gold nanoshells are concentric sphere nanoparticles consisting of a dielectric silica core and a gold shell. By varying the relative thickness of the core and shell layers, the plasmon-derived optical resonance of gold can be dramatically shifted in wavelength from the visible region into the infrared over a wavelength...
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