Enhancement of photoacoustic imaging quality by using CMUT technology: Experimental study

2014 ◽  
Author(s):  
Maeva Vallet ◽  
Francois Varray ◽  
Mohammad Azizian Kalkhoran ◽  
Didier Vray ◽  
Jerome Boutet
Keyword(s):  
Experimental Study ◽  
Photoacoustic Imaging ◽  
Imaging Quality

Nanomaterials for photoacoustic imaging in the second near-infrared window

2019 ◽  
Vol 7 (2) ◽  
pp. 472-479 ◽  
Author(s):  
Kai Huang ◽  
Yifan Zhang ◽  
Jing Lin ◽  
Peng Huang
Keyword(s):  
Contrast Agents ◽  
Near Infrared ◽  
Photoacoustic Imaging ◽  
Tissue Penetration ◽  
Imaging Quality ◽  
Enhanced Imaging ◽  
Infrared Window

The use of nanomaterials as contrast agents for photoacoustic imaging in the NIR-II window enables enhanced imaging quality with deeper tissue penetration.

Adaptive photoacoustic imaging quality optimization with EMD and reconstruction

2016 ◽  
Author(s):  
Chengwen Guo ◽  
Yao Ding ◽  
Jie Yuan ◽  
Guan Xu ◽  
Xueding Wang ◽  
...  
Keyword(s):  
Photoacoustic Imaging ◽  
Quality Optimization ◽  
Imaging Quality

Computation of Photoacoustic Absorber Size from Deconvolved Photoacoustic Signal Using Estimated System Impulse Response

2020 ◽  
Vol 43 (1) ◽  
pp. 46-56
Author(s):  
Nikita Rathi ◽  
Saugata Sinha ◽  
Bhargava Chinni ◽  
Vikram Dogra ◽  
Navalgund Rao
Keyword(s):  
Experimental Study ◽  
Wavelet Transform ◽  
Impulse Response ◽  
Imaging System ◽  
Photoacoustic Imaging ◽  
Photoacoustic Signal ◽  
Mustard Seed ◽  
Discrete Wavelet ◽  
Simulation Studies ◽  
Homomorphic Filtering

Photoacoustic signal recorded by photoacoustic imaging system can be modeled as convolution of initial photoacoustic response by the photoacoustic absorber with the system impulse response. Our goal was to compute the size of photoacoustic absorber using the initial photoacoustic response, deconvolved from the recorded photoacoustic data. For deconvolution, we proposed to use the impulse response of the photoacoustic system, estimated using discrete wavelet transform based homomorphic filtering. The proposed method was implemented on experimentally acquired photoacoustic data generated by different phantoms and also verified by a simulation study involving photoacoustic targets, identical to the phantoms in experimental study. The photoacoustic system impulse response, which was estimated using the acquired photoacoustic signal corresponding to a lead pencil, was used to extract initial photoacoustic response corresponding to a mustard seed of 0.65 mm radius. The recovered radius values of the mustard seed, corresponding to the experimental and simulation studies were 0.6 mm and 0.7 mm.

Experimental study on the restoration from a tilt-azimuth series for improvement in resolution

1995 ◽  
Vol 53 ◽  
pp. 636-637
Author(s):  
Norio Baba ◽  
Norihiko Ichise ◽  
Syunya Watanabe
Keyword(s):  
Experimental Study ◽  
Spherical Aberration ◽  
Incident Beam ◽  
Optical Parameters ◽  
Beam Tilting ◽  
Illumination Method ◽  
Restoration Method ◽  
Illumination Mode

The tilted beam illumination method is used to improve the resolution comparing with the axial illumination mode. Using this advantage, a restoration method of several tilted beam images covering the full azimuthal range was proposed by Saxton, and experimentally examined. To make this technique more reliable it seems that some practical problems still remain. In this report the restoration was attempted and the problems were considered. In our study, four problems were pointed out for the experiment of the restoration. (1) Accurate beam tilt adjustment to fit the incident beam to the coma-free axis for the symmetrical beam tilting over the full azimuthal range. (2) Accurate measurements of the optical parameters which are necessary to design the restoration filter. Even if the spherical aberration coefficient Cs is known with accuracy and the axial astigmatism is sufficiently compensated, at least the defocus value must be measured. (3) Accurate alignment of the tilt-azimuth series images.

An Experimental Study of Some Properties of Stuttered Words

1962 ◽  
Vol 5 (4) ◽  
pp. 387-394 ◽  
Author(s):  
Bruce Quarrington ◽  
Jerome Conway ◽  
Nathan Siegel
Keyword(s):  
Experimental Study

Experimental study of total body washout employing extracorporeal circulation and hypothermia

1974 ◽  
Vol 126 (2) ◽  
pp. 243-248
Author(s):  
A WAKABAYASHI ◽  
T KUBO ◽  
K CHARNEY ◽  
Y NAKAMURA ◽  
J CONNOLLY
Keyword(s):  
Experimental Study ◽  
Extracorporeal Circulation ◽  
Total Body

Gastric Freezing: An Experimental Study

1963 ◽  
Vol 45 (3) ◽  
pp. 374-383 ◽  
Author(s):  
Donald C. McIlrath ◽  
George A. Hallenbeck ◽  
Hubert A. Allen ◽  
Charles V. Mann ◽  
Edward J. Baldes ◽  
...  
Keyword(s):  
Experimental Study
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