Acoustic dipole radiation based electrical impedance contrast imaging approach of magnetoacoustic tomography with magnetic induction

2013 ◽  
Vol 40 (5) ◽  
pp. 052902 ◽  
Author(s):  
Xiaodong Sun ◽  
Dawei Fang ◽  
Dong Zhang ◽  
Qingyu Ma
Keyword(s):  
Magnetic Induction ◽  
Electrical Impedance ◽  
Contrast Imaging ◽  
Dipole Radiation ◽  
Impedance Contrast ◽  
Imaging Approach

Acoustic dipole radiation based conductivity image reconstruction for magnetoacoustic tomography with magnetic induction

2012 ◽  
Vol 100 (2) ◽  
pp. 024105 ◽  
Author(s):  
Xiaodong Sun ◽  
Feng Zhang ◽  
Qingyu Ma ◽  
Juan Tu ◽  
Dong Zhang
Keyword(s):  
Image Reconstruction ◽  
Magnetic Induction ◽  
Dipole Radiation ◽  
Conductivity Image

scholarly journals Acoustic Angiography: A New Imaging Modality for Assessing Microvasculature Architecture

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Ryan C. Gessner ◽  
C. Brandon Frederick ◽  
F. Stuart Foster ◽  
Paul A. Dayton
Keyword(s):  
High Resolution ◽  
Imaging Modality ◽  
Dual Frequency ◽  
Contrast Imaging ◽  
3D Images ◽  
Tissue Integration ◽  
Contrast Enhanced ◽  
Imaging Approach ◽  
Microvascular Architecture ◽  
Frequency Ultrasound

The purpose of this paper is to provide the biomedical imaging community with details of a new high resolution contrast imaging approach referred to as “acoustic angiography.” Through the use of dual-frequency ultrasound transducer technology, images acquired with this approach possess both high resolution and a high contrast-to-tissue ratio, which enables the visualization of microvascular architecture without significant contribution from background tissues. Additionally, volumetric vessel-tissue integration can be visualized by using b-mode overlays acquired with the same probe. We present a brief technical overview of how the images are acquired, followed by several examples of images of both healthy and diseased tissue volumes. 3D images from alternate modalities often used in preclinical imaging, contrast-enhanced micro-CT and photoacoustics, are also included to provide a perspective on how acoustic angiography has qualitatively similar capabilities to these other techniques. These preliminary images provide visually compelling evidence to suggest that acoustic angiography may serve as a powerful new tool in preclinical and future clinical imaging.

scholarly journals Electrical Impedance tomography – recent applications and developments

2021 ◽  
Vol 12 (1) ◽  
pp. 50-62
Author(s):  
Sofiene Mansouri ◽  
Yousef Alharbi ◽  
Fatma Haddad ◽  
Souhir Chabcoub ◽  
Anwar Alshrouf ◽  
...  
Keyword(s):  
Image Reconstruction ◽  
Electrical Impedance Tomography ◽  
Electrical Impedance ◽  
Low Cost ◽  
Noninvasive Imaging ◽  
Imaging Method ◽  
Impedance Tomography ◽  
Large Margin ◽  
Reconstruction Methods ◽  
Imaging Approach

Abstract Electrical impedance tomography (EIT) is a low-cost noninvasive imaging method. The main purpose of this paper is to highlight the main aspects of the EIT method and to review the recent advances and developments. The advances in instrumentation and in the different image reconstruction methods and systems are demonstrated in this review. The main applications of the EIT are presented and a special attention made to the papers published during the last years (from 2015 until 2020). The advantages and limitations of EIT are also presented. In conclusion, EIT is a promising imaging approach with a strong potential that has a large margin of progression before reaching the maturity phase.

scholarly journals Imaging Conductivity Changes in Monolayer Graphene Using Electrical Impedance Tomography

Micromachines ◽  
2020 ◽  
Vol 11 (12) ◽  
pp. 1074
Author(s):  
Anil Kumar Khambampati ◽  
Sheik Abdur Rahman ◽  
Sunam Kumar Sharma ◽  
Woo Young Kim ◽  
Kyung Youn Kim
Keyword(s):  
Electrical Impedance Tomography ◽  
Electrical Impedance ◽  
Monolayer Graphene ◽  
Impedance Tomography ◽  
Graphene Surface ◽  
Conductivity Distribution ◽  
Conductivity Change ◽  
Modeling Errors ◽  
Imaging Approach ◽  
Difference Imaging

Recently, graphene has gained a lot of attention in the electronic industry due to its unique properties and has paved the way for realizing novel devices in the field of electronics. For the development of new device applications, it is necessary to grow large wafer-sized monolayer graphene samples. Among the methods to synthesize large graphene films, chemical vapor deposition (CVD) is one of the promising and common techniques. However, during the growth and transfer of the CVD graphene monolayer, defects such as wrinkles, cracks, and holes appear on the graphene surface. These defects can influence the electrical properties and it is of interest to know the quality of graphene samples non-destructively. Electrical impedance tomography (EIT) can be applied as an alternate method to determine conductivity distribution non-destructively. The EIT inverse problem of reconstructing conductivity is highly non-linear and is heavily dependent on measurement accuracy and modeling errors related to an accurate knowledge of electrode location, contact resistances, the exact outer boundary of the graphene wafer, etc. In practical situations, it is difficult to eliminate these modeling errors as complete knowledge of the electrode contact impedance and outer domain boundary is not fully available, and this leads to an undesirable solution. In this paper, a difference imaging approach is proposed to estimate the conductivity change of graphene with respect to the reference distribution from the data sets collected before and after the change. The estimated conductivity change can be used to locate the defects on the graphene surface caused due to the CVD transfer process or environment interaction. Numerical and experimental results with graphene sample of size 2.5 × 2.5 cm are performed to determine the change in conductivity distribution and the results show that the proposed difference imaging approach handles the modeling errors and estimates the conductivity distribution with good accuracy.

Study of Magnetoacoustic Tomography with Injecting Current by Experiment

2013 ◽  
Vol 756-759 ◽  
pp. 4677-4680 ◽  
Author(s):  
Xin Huang ◽  
Guo Qiang Liu ◽  
Hui Xia
Keyword(s):  
Power Supply ◽  
Magnetic Induction ◽  
Theoretical Basis ◽  
Electrical Impedance ◽  
Imaging Method ◽  
Impedance Tomography ◽  
Good Spatial Resolution ◽  
Ac Power ◽  
Good Contrast ◽  
Selection Of

Magnetoacoustic Tomography (MAT) is a new imaging method. MAT combines the good contrast of electrical impedance tomography with the good spatial resolution of ultrasound imaging. Magnetoacoustic Tomography includes Magnetoacoustic Tomography with magnetic induction and Magnetoacoustic Tomography with injecting current. In this paper we researched the later imaging method mainly; in paper we studied the parameters of AC power supply, which was injected to the imaging sample. At the same time, the waveforms of experiment were given and analyzed, which provides theoretical basis for the selection of power supply used in the subsequent experiments.

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