Adaptive multi-sample-based photoacoustic tomography with imaging quality optimization

2015 ◽  
Vol 13 (6) ◽  
pp. 061001-61005 ◽  
Author(s):  
Yuxin Wang Yuxin Wang ◽  
Jie Yuan Jie Yuan ◽  
Sidan Du Sidan Du ◽  
Xiaojun Liu Xiaojun Liu ◽  
Guan Xu Guan Xu ◽  
...  
Keyword(s):  
Photoacoustic Tomography ◽  
Quality Optimization ◽  
Imaging Quality

Adaptive speed of sound correction with photoacoustic tomography for imaging quality optimization

2016 ◽  
Vol 14 (8) ◽  
pp. 081701-81705
Author(s):  
Meng Ye Meng Ye ◽  
Meng Cao Meng Cao ◽  
Jie Yuan Jie Yuan ◽  
Yudi Chen Yudi Chen ◽  
Qian Cheng Qian Cheng ◽  
...  
Keyword(s):  
Speed Of Sound ◽  
Photoacoustic Tomography ◽  
Quality Optimization ◽  
Imaging Quality

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

Antireflection Coatings for Semiconductor Failure Analysis

2000 ◽  
Author(s):  
Brennan Davis ◽  
Wilson Chi
Keyword(s):  
Failure Analysis ◽  
Material Properties ◽  
Antireflection Coating ◽  
Antireflection Coatings ◽  
Imaging Quality ◽  
Quality Material

Abstract The use of an antireflection coating for backside semiconductor failure analysis is discussed. The process of selecting an appropriate coating is described. Several known coatings are also described in regards to imaging quality, material properties, and the benefits to device analysis applications.

Applying Probabilistic Water Quality Standards in River Basin Water Quality Optimization Models

1974 ◽  
Vol 9 (1) ◽  
pp. 25-29
Author(s):  
M. B. Bayer
Keyword(s):  
Water Quality ◽  
River Basin ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Minimum Cost ◽  
Water Quality Standards ◽  
Quality Optimization ◽  
Basin Water ◽  
Do Concentration ◽  
Water Quality Models

Abstract This paper describes a method of applying probabilistic DO (dissolved oxygen) and BOD (biochemical oxygen demand) standards in river basin water quality models. Maximum likelihood estimators for the DO and BOD concentrations variances for each reach are used to obtain a lower bound for BOD so that the probability of violating specified DO and BOD standards is less than Θ per cent in any reach. These boundary values for DO and BOD concentrations are incorporated into a nonlinear water quality optimization model for finding the minimum cost set of wastewater treatment plant efficiencies required to meet DO and BOD standards. The method also provides the minimum DO concentration and the maximum BOD concentration which may be expected to occur 1-Θ of the time for any reach.

scholarly journals Micro Non-Uniform Linear Array (MNULA) for Ultrasound Plane Wave Imaging

Sensors ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 640
Author(s):  
Yujia Tang ◽  
Zhangjian Li ◽  
Yaoyao Cui ◽  
Chen Yang ◽  
Jiabing Lv ◽  
...  
Keyword(s):  
Plane Wave ◽  
Linear Array ◽  
Near Field ◽  
Uniform Linear Array ◽  
Imaging Technology ◽  
Linear Arrays ◽  
Imaging Quality ◽  
Imaging Results ◽  
Wave Imaging ◽  
Laboratory Technology

Ultrasound plane wave imaging technology has been applied to more clinical situations than ever before because of its rapid imaging speed and stable imaging quality. Most transducers used in plane wave imaging are linear arrays, but their structures limit the application of plane wave imaging technology in some special clinical situations, especially in the endoscopic environment. In the endoscopic environment, the size of the linear array transducer is strictly miniaturized, and the imaging range is also limited to the near field. Meanwhile, the near field of a micro linear array has serious mutual interferences between elements, which is against the imaging quality of near field. Therefore, we propose a new structure of a micro ultrasound linear array for plane wave imaging. In this paper, a theoretical comparison is given through sound field and imaging simulations. On the basis of primary work and laboratory technology, micro uniform and non-uniform linear arrays were made and experimented with the phantom setting. We selected appropriate evaluation parameters to verify the imaging results. Finally, we concluded that the micro non-uniform linear array eliminated the artifacts better than the micro uniform linear array without the additional use of signal processing methods, especially for target points in the near-field. We believe this study provides a possible solution for plane wave imaging in cramped environments like endoscopy.

scholarly journals The role of cochlear implant positioning on MR imaging quality: a preclinical in vivo study with a novel implant magnet system

2021 ◽  
Author(s):  
Pietro Canzi ◽  
Marianna Magnetto ◽  
Anna Simoncelli ◽  
Marco Manfrin ◽  
Federico Aprile ◽  
...  
Keyword(s):  
Mr Imaging ◽  
Cochlear Implant ◽  
Occipital Lobe ◽  
Brain Structures ◽  
Magnet System ◽  
High Positive Correlation ◽  
Imaging Quality ◽  
Signal Void ◽  
Mri Surveillance

Abstract Purposes To investigate the effects for Ultra 3D cochlear implant (CI) positioning on MR imaging quality, looking at a comprehensive description of intracranial structures in cases of unilateral and bilateral CI placement. Methods Four CI angular positions (90°, 120°, 135° and 160°) at 9 cm distance from the outer-ear canal were explored. The 1.5 T MRI assessment included our institutional protocol for the investigation of brain pathologies without gadolinium application. Three investigators (two experienced neuroradiologists and one experienced otoneurosurgeon) independently evaluated the MR findings. A 4-point scale was adopted to describe 14 intracranial structures and to determine which CI positioning allowed the best image quality score and how bilateral CI placement modified MRI scan visibility. Results A high positive correlation was found between the three blinded observers. Structures situated contralateral from the CI showed high-quality values in all four placements. Structures situated ipsilaterally provided results suitable for diagnostic purposes for at least one position. At 90°, artifacts mainly involved brain structures located cranially and anteriorly (e.g., temporal lobe); on the contrary, at 160°, artifacts mostly influenced the posterior fossa structures (e.g., occipital lobe). For the bilateral CI condition, MR imaging examination revealed additional artifacts involving all structures located close to either CI, where there was a signal void/distortion area. Conclusions Suitable unilateral CI positioning can allow the visualization of intracranial structures with sufficient visibility for diagnostic purposes. Bilateral CI positioning significantly deteriorates the anatomical visibility. CI positioning might play a crucial role for patients who need post-operative MRI surveillance.

scholarly journals Role of blood oxygenation saturation in ovarian cancer diagnosis using multi‐spectral photoacoustic tomography

2020 ◽  
Author(s):  
Eghbal Amidi ◽  
Guang Yang ◽  
K. M. Shihab Uddin ◽  
Hongbo Luo ◽  
William Middleton ◽  
...  
Keyword(s):  
Ovarian Cancer ◽  
Cancer Diagnosis ◽  
Blood Oxygenation ◽  
Photoacoustic Tomography
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