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2 X-Acoustics: Imaging and Sensing

2 2015

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Detection of Ultrasound and Photoacoustic Imaging with Fiber Bragg Gratings

100%

Shuaiqi J. , Jianye S. , Nengzhu Z. , Lin H. , Jian R.

X-Acoustics: Imaging and Sensing

2014

tom 1

nr 1

In this paper, we explore a simple and effective fiber Bragg grating demodulation setup to detect ultrasound. Different frequency ultrasound from hundreds of kHz to several MHz were detected successfully. For the first time, we combine ultrasound from a PZT transducer with a photoacoustic imaging systemto obtain a clear photoacoustic image of our pencil lead sample. With the advantage of small size and all-optical features, this method has the potential to be applied to medical endoscopic examination in an electromagnetic environment. This preliminary study suggests that the ultrasound detection with fiber Bragg grating is both meaningful and feasible.

Thermoacoustic imaging of human finger joints and bones

86%

Lin H. , Weizhi Q. , Yuan Z. , Zihui C. , Nengzhu Z. , Jian R. , Dakun L.

X-Acoustics: Imaging and Sensing

2014

tom 1

nr 1

In this study, we explore a new application of thermoacoustic tomography (TAT) for imaging human finger joints and bones. Three volunteers’ finger joints and bones were visualized with satisfying image contrast and spatial resolution by a TAT scanner. The recovered TAT images revealed apparent microwave absorption differences between the joint cavity and bone. Beyond the full single finger imaging, a volunteer’s four fingers were clearly and concurrently imaged. To confirm our observations, MRI images of two volunteers’ fingers were performed, and the TAT recovered shape/size of the fingers were consistent with the MRI findings. To further assess the feasibility of TAT for finger joint and bone imaging, we quantitatively calculated the conductivity of a case. This initial study suggests that TAT may be a good candidate for screening, diagnosing, and monitoring treatment of joint and bone diseases.