Investigation of Radiofrequency Ultrasound-Based Fibrotic Tissue Strain Imaging Method Employing Endogenous Motion

2019 ◽  
Vol 38 (9) ◽  
pp. 2315-2327 ◽  
Author(s):  
Andrius Sakalauskas ◽  
Rytis Jurkonis ◽  
Sigita Gelman ◽  
Arūnas Lukoševičius ◽  
Limas Kupčinskas
Keyword(s):  
Strain Imaging ◽  
Imaging Method ◽  
Fibrotic Tissue ◽  
Tissue Strain

Towards Crack Trajectory Identification via the Direct Strain Imaging Method

2015 ◽  
Author(s):  
Athanasios Iliopoulos ◽  
John G. Michopoulos
Keyword(s):  
Mechanical Load ◽  
Deformable Body ◽  
Accurate Determination ◽  
Strain Tensor ◽  
Strain Imaging ◽  
Imaging Method ◽  
Extended Finite Element ◽  
Strain Compatibility ◽  
Crack Trajectory

In this paper we present an investigation on the feasibility of exploiting the Direct Strain Imaging (DSI) method for the purpose of tracking propagating discontinuities on the surface of a deformable body under mechanical load. The proposed approach is based on a strain compatibility functional that does not require any assumptions about the continuity conditions of the underlying medium. The proposed approach is based on the recently introduced Direct Strain Imaging method that is used to identify with high accuracy the full fields of strain tensor components that are required to define the strain compatibility functional. We performed synthetic numerical experiments based on the exercising the eXtended Finite Element Method solution for simulating a propagating crack of a particular problem in order to assess the feasibility and potential of the proposed approach. We demonstrated that indeed our DSI-based approach can achieve a very accurate determination of the crack trajectory even under noisy conditions.

Performance Analysis and Experimental Validation of the Direct Strain Imaging Method

2013 ◽  
Author(s):  
Athanasios Iliopoulos ◽  
John G. Michopoulos ◽  
John C. Hermanson
Keyword(s):  
Experimental Validation ◽  
Strain Tensor ◽  
Operating Parameter ◽  
Strain Imaging ◽  
Imaging Method ◽  
Engineering Strain ◽  
Full Field ◽  
Strain Measurements ◽  
Full Field Measurement ◽  
Preliminary Validation

Direct Strain Imaging accomplishes full field measurement of the strain tensor on the surface of a deforming body, by utilizing arbitrarily oriented engineering strain measurements originating from digital imaging. In this paper an evaluation of the method’s performance with respect to its operating parameter space is presented along with a preliminary validation based on actual experiments on composite material specimens under tension. It has been shown that the method exhibits excellent accuracy characteristics and outperforms methods based on displacement differentiation.

scholarly journals Is Left Ventricular Global Longitudinal Strain by Two-Dimensional Speckle Tracking Echocardiography in Sepsis Cardiomyopathy Ready for Prime Time Use in the ICU?

Healthcare ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 5 ◽  
Author(s):  
Venu Madhav Velagapudi ◽  
Rahul Pidikiti ◽  
Dennis A. Tighe
Keyword(s):  
Speckle Tracking ◽  
Longitudinal Strain ◽  
Speckle Tracking Echocardiography ◽  
Global Longitudinal Strain ◽  
Strain Imaging ◽  
Left Ventricular ◽  
Mortality Prediction ◽  
The Body ◽  
Imaging Method ◽  
Myocardial Deformation Imaging

Myocardial deformation imaging (strain imaging) is a technique to directly quantify the extent of myocardial contractility and overcomes several of the limitations of ejection fraction. The application of the most commonly used strain imaging method; speckle-tracking echocardiography to patients with sepsis cardiomyopathy heralds an exciting development to the field. However; the body of evidence and knowledge on the utility, feasibility and prognostic value of left ventricular global longitudinal strain in sepsis cardiomyopathy is still evolving. We conducted a review of literature on utility of left ventricular global longitudinal strain in sepsis cardiomyopathy. We discuss the role of left ventricular global longitudinal strain in mortality prediction, utility and limitations of the technique in the context of sepsis cardiomyopathy.

scholarly journals MYOCARDIAL LAYER-SPECIFIC EFFECT OF MYOBLAST CELL SHEET IMPLANTATION FOR MYOCARDIAL REGENERATION EVALUATED BY TISSUE STRAIN IMAGING STUDY

2011 ◽  
Vol 57 (14) ◽  
pp. E2048
Author(s):  
Yasuhiro Shudo ◽  
Shigeru Miyagawa ◽  
Satoshi Nakatani ◽  
Atsuhiro Saito ◽  
Taichi Sakaguchi ◽  
...  
Keyword(s):  
Cell Sheet ◽  
Specific Effect ◽  
Imaging Study ◽  
Strain Imaging ◽  
Myocardial Regeneration ◽  
Tissue Strain ◽  
Myoblast Cell ◽  
Myocardial Layer

Noninvasive assessment of liver disease—measurement of hepatic fibrosis using tissue strain imaging

2007 ◽  
Vol 31 (2) ◽  
pp. 87-92 ◽  
Author(s):  
Naoki Hotta ◽  
Minoru Ayada ◽  
Akihiko Okumura ◽  
Tetsuya Tshikawa ◽  
Ken Sato ◽  
...  
Keyword(s):  
Liver Disease ◽  
Hepatic Fibrosis ◽  
Strain Imaging ◽  
Tissue Strain ◽  
Noninvasive Assessment
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