scholarly journals Plate-Like Structure Damage Acoustic Emission Beamforming Array Technique and Probability-Based Diagnostic Imaging Method

10.5772/62413 ◽  
2016 ◽  
Author(s):  
Dongsheng Li ◽  
Mengdao Jin ◽  
Quanming Feng
Keyword(s):  
Acoustic Emission ◽  
Diagnostic Imaging ◽  
Imaging Method ◽  
Structure Damage

scholarly journals An Aircraft Pallet Damage Monitoring Method Based on Damage Subarea Identification and Probability-Based Diagnostic Imaging

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Bin Liu ◽  
Tingzhang Liu ◽  
Yue Lin ◽  
Jianfei Zhao
Keyword(s):  
Diagnostic Imaging ◽  
Lamb Wave ◽  
Damage Index ◽  
Imaging Method ◽  
Monitoring Method ◽  
Study Results ◽  
Damage Monitoring ◽  
Weighted Algorithm ◽  
Damage Simulation ◽  
Monitoring Area

To improve the safety and economy of aircraft pallet use, an aircraft pallet damage monitoring method based on damage subarea identification and probability-based diagnostic imaging is proposed. In the proposed method, first, the large aircraft pallet monitoring area is divided into rectangular subareas, and a piezoelectric transducer sensor is pasted on each vertex of the rectangular subarea that is used to excitation and sensing the Lamb wave. Second, the damage subarea is identified according to the diagonal damage indexes. Third, the damage position in the damage subarea is calculated using the probability-based diagnostic imaging method and coordinate probability weighted algorithm. Finally, the aircraft pallet damage can be localized based on the damage subarea position. Frequency selection and damage simulation study results show that the Lamb wave is sensitive to aircraft pallet damage whose centre frequency ranges from 50 kHz to 150 kHz, and the damage index of a steel ball is less than that of all real aircraft pallet damage from 95 kHz to 125 kHz. The verification results show that the proposed method can locate aircraft pallet damage with an error of less than 2 cm.

scholarly journals A Diagnostic Imaging Method – Shear Wave Elastography

2018 ◽  
Vol 1 (1) ◽  
pp. 14-22
Author(s):  
Marketa Zemanova
Keyword(s):  
Diagnostic Imaging ◽  
Shear Wave ◽  
Elastic Properties ◽  
Soft Tissues ◽  
Shear Wave Elastography ◽  
Biological Tissues ◽  
Utilization Rate ◽  
Quantitative Aspect ◽  
Imaging Method ◽  
Endocrine Orbitopathy

Shear Wave Elastography (SWE) is a non-invasive diagnostic imaging technique, that maps the elastic properties of tissues. Nowadays this modality develops increasingly in medicine across its disciplines and opens a new era of high-quality ultrasound examination because it increases the specificity and thus improves diagnostic assurance. This method is similar to manual palpation, shows elastic properties of biological tissues and provides a kind of reconstruction of the internal structure of soft tissues based on measurement of the response of tissue compression. Results: This method is already used routinely in the detection and diagnosis of breast cancer and thyroid cancer, prostate cancer, in hepatology, cardiology, view of the carotid arteries and lymphatic nodules. Standards of elasticity values for human tissues such as the mammary gland, liver, prostate or thyroid gland are progressively being created across the medical fields. Finally, the article examines its unquestioned benefit in ophthalmology. In ophthalmology, it already appears as an up-and-coming method in diagnostics and in evaluating the changes in oculomotor muscles and orbital tissues in patients with endocrine orbitopathy. Conclusion: Shear wave elastography offers three main innovations: the quantitative aspect, dimensional resolution, and real-time imaging ability. Determination of the utilization rate of this method and its inclusion into the diagnostics of endocrine orbitopathy is still a question and the subject of presently conducted clinical studies.

scholarly journals Acoustic Emission Localization in a Composite Stiffened Panel Using a Time Reversal Algorithm

2011 ◽  
Vol 471-472 ◽  
pp. 910-915
Author(s):  
Francesco Ciampa ◽  
Michele Meo
Keyword(s):  
Acoustic Emission ◽  
Time Reversal ◽  
Mode Conversion ◽  
Research Work ◽  
Composite Panel ◽  
Computational Time ◽  
Stiffened Panel ◽  
Imaging Method ◽  
Impact Point ◽  
The Impact

This research work presents an in-situ imaging method for the localization of the impact point in complex anisotropic structures with diffuse field conditions, using only one passive transducer. The proposed technique is based on the time reversal approach applied to a number of waveforms stored into a database containing the experimental Green’s function of the medium. The present method exploits the benefits of multiple scattering, mode conversion and boundaries reflections to achieve the focusing of the source with high resolution. The optimal re-focusing of the back propagated wave field at the impact point is accomplished through a “virtual” imaging process, which does not require any iterative algorithms and a priori knowledge of the mechanical properties of the structure. The robustness of the time reversal method is experimentally demonstrated on a stiffened composite panel and the source position can be retrieved with a high level of accuracy (error less than 3%). The simple configuration, minimal processing requirements and computational time (less than 1 sec) make this method a valid alternative to the conventional imaging structural health monitoring systems for the acoustic emission source localization.

Interstitial MR lymphangiography—A diagnostic imaging method for the evaluation of patients with clinically advanced stages of lymphedema

Acta Tropica ◽  
2007 ◽  
Vol 104 (1) ◽  
pp. 8-15 ◽  
Author(s):  
Christian Lohrmann ◽  
Etelka Foeldi ◽  
Jean-Paul Bartholomä ◽  
Mathias Langer
Keyword(s):  
Diagnostic Imaging ◽  
Imaging Method ◽  
Advanced Stages

scholarly journals Peculiarities of depressive disturbances at cerebral stroke with different lesion focus localization (by neuro-imaging method data)

2004 ◽  
Vol 3 (2) ◽  
pp. 61-66
Author(s):  
N. G. Katayeva ◽  
A. Yu. Levina
Keyword(s):  
Magnetic Resonance Tomography ◽  
Self Concept ◽  
Cerebral Stroke ◽  
Imaging Method ◽  
Structure Damage ◽  
Focus Localization ◽  
Neuro Imaging ◽  
The Right ◽  
Affective Disturbances ◽  
Stem Structure

The aim of investigation has been a specification of affective disturbances at patients in acute stroke period depending on the lesion focus. Affective disturbances have been revealed by imaging methods — computed and magnetic resonance tomography (CT or MRT). 72 patients with strokes have been examined (41 women and 31 men). Affective disturbances have been evaluated according to criterions and have been specified with depression self-concept scale of Beck. During the investigation the following conclusions have been made: 1) depressive disturbances of all the patients have had the character of light depressive episode (average mark by Beck scale — 22,14 ± 1,59); 2) depressive disturbance frequency have been significantly greater at stem structure damage than of the right (p < 0,001) and left (p < 0,05) hemispheres; 3) depressive disturbances have been revealed more frequently at single persons (p < 0,05).

Acoustic Emission Location Technology Research Based on FBG Sensor Network and Time Reversal Focusing Imaging Method

2014 ◽  
Vol 41 (8) ◽  
pp. 0805003 ◽  
Author(s):  
赛耀樟 Sai Yaozhang ◽  
姜明顺 Jiang Mingshun ◽  
隋青美 Sui Qingmei ◽  
路士增 Lu Shizeng ◽  
贾磊 Jia Lei
Keyword(s):  
Acoustic Emission ◽  
Sensor Network ◽  
Time Reversal ◽  
Imaging Method ◽  
Technology Research ◽  
Fbg Sensor

scholarly journals Diagnostic Value of Endoscopic Retrograde Cholangiopancreatography and Therapeutic Value of Endoscopic Sphincterotomy in Dogs With Suspected Hepatobiliary Disorders

2020 ◽  
Author(s):  
Vahideh Rahmani ◽  
Thomas Spillmann ◽  
Jorma Halttunen ◽  
Pernilla Syrjä ◽  
Mirja Ruohoniemi
Keyword(s):  
Diagnostic Imaging ◽  
Endoscopic Retrograde Cholangiopancreatography ◽  
Case Series ◽  
Diagnostic Value ◽  
Diagnostic Methods ◽  
Imaging Method ◽  
Success Rates ◽  
Retrospective Case ◽  
Endoscopic Retrograde ◽  
Us Findings

Abstract Background: Conventional diagnostic methods have some limitations in diagnosing specific causes of canine hepatobiliary disorders. In the evaluation of the hepatobiliary system in dogs, ultrasonography (US) is the first imaging method of choice. Nonetheless, endoscopic retrograde cholangiopancreatography (ERCP) has also been proven to be a practicable technique for evaluating canine hepatobiliary (endoscopic retrograde cholangiography, ERC) and pancreatic duct (endoscopic retrograde pancreatography, ERP) disorders, providing additional therapeutic options by sphincterotomy (EST). To date, the efficacy and safety of diagnostic and therapeutic ERCP has not been evaluated in veterinary medicine literature. The present study sought to report complications and outcomes of dogs undergoing ERCP and EST, and to assess the usefulness of diagnostic ERCP by comparing the findings of US, ERCP and histopathological findings in liver and pancreas. Results: This retrospective case series comprises data collected from 15 dogs that underwent successful ERC/ERCP. Nine dogs underwent EST following ERC. US and ERC were most in agreement when assessing the common bile duct. In case of disagreement between the modalities, the ERC findings of the ductal structures were in line with the available pathology findings more often than the US findings, whereas the opposite was noted for the gallbladder. The technical success rates were 88.2% for ERC, 66.7% for ERP, and 81.8% for EST, with no major complications during or immediately after the procedure. Immediate bile flow after EST was recorded in 7/9 dogs but only four showed coinciding clinical and laboratory improvement and four dogs were euthanized within one to six days after EST. Conclusions: US remains a valuable initial diagnostic imaging method for hepatobiliary disorders and allows good assessment of the gallbladder. ERC can serve as a complementary procedure for diagnostic assessment of the hepatobiliary duct disorders. However, in order to improve the outcomes of EST, careful selection of patients for the procedure would require more advanced diagnostic imaging of the hepatobiliary area.

scholarly journals Clinical applications of imaging modalities of the carpal joint in dogs with particular reference to the carpal canal

2020 ◽  
Vol 64 (1) ◽  
pp. 169-174
Author(s):  
Angelika Tobolska ◽  
Zbigniew Adamiak ◽  
Joanna Głodek
Keyword(s):  
Diagnostic Imaging ◽  
Soft Tissues ◽  
Current Knowledge ◽  
Wrist Joint ◽  
Imaging Techniques ◽  
Imaging Modalities ◽  
Imaging Method ◽  
Joint Surfaces ◽  
Small Joint ◽  
Carpal Joint

AbstractThe structure of the canine carpal joint is complex. This small joint consists of articulations that include the antebrachiocarpal, middle, carpometacarpal, and intercarpal joint surfaces. A large number of ligaments and tendons support and stabilise the carpus in dogs. Many injuries of this joint in dogs are not correctly recognised, diagnosed, or treated due to the limited use of diagnostic imaging methods. Radiography, the most common of them, has extensive application in diagnosing the causes of lameness in small animals. Other techniques, such as ultrasonography, computed tomography, and magnetic resonance imaging visualise other joint structures and surrounding soft tissues. However, these imaging modalities are rarely used to diagnose diseases and injuries of the canine carpus at present. The main reason for this is the small amount of research carried out and the lack of a properly described methodology for the use of imaging techniques. The wide use of all diagnostic imaging tools in the diagnosis of diseases and injuries of the wrist joint in humans shows that conducting studies on dogs could expand current knowledge. The use of these techniques in veterinary medicine could facilitate diagnosis and subsequent therapy of carpal disorders in dogs. MRI is the most frequently used imaging method in human medicine for visualisation of abnormalities of joints. This method could become a valuable part of the detection of inflammatory, traumatic, and degenerative diseases of the carpal joint in dogs.

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