Nonlinear ultrasound simulation for heterogeneous nonlinear coefficient media

2013 ◽  
Vol 134 (5) ◽  
pp. 3980-3980
Author(s):  
François Varray ◽  
Christian Cachard ◽  
Piero Tortoli ◽  
Olvier Basset
Keyword(s):  
Nonlinear Coefficient ◽  
Ultrasound Simulation ◽  
Nonlinear Ultrasound

scholarly journals Nonlinear ultrasound simulation in an axisymmetric coordinate system using a k-space pseudospectral method

2020 ◽  
Vol 148 (4) ◽  
pp. 2288-2300
Author(s):  
Bradley E. Treeby ◽  
Elliott S. Wise ◽  
Filip Kuklis ◽  
Jiri Jaros ◽  
B. T. Cox
Keyword(s):  
Coordinate System ◽  
Pseudospectral Method ◽  
Ultrasound Simulation ◽  
Nonlinear Ultrasound

scholarly journals Evaluation of Damage Process of a Coating by Using Nonlinear Ultrasonic Method

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 440
Author(s):  
Chunguang Xu ◽  
Lei He ◽  
Shiyuan Zhou ◽  
Dingguo Xiao ◽  
Pengzhi Ma
Keyword(s):  
Tensile Stress ◽  
Order Parameter ◽  
Evaluation Method ◽  
Early Stage ◽  
Ultrasonic Method ◽  
Nonlinear Coefficient ◽  
Damage Index ◽  
Second Order ◽  
External Loading ◽  
Nonlinear Ultrasonic

During the service or external loading of the surface coating, the damage accumulation may develop in the coating or at the interface between the substrate and the coating, but it is difficult to measure directly in the early stage, so the acoustic nonlinear parameters are used as the early damage index of the coating. In this paper, the nonlinear wave motion equation is solved by the perturbation method and the new relationship between the relative ratio of second-order parameter and third-order parameter was derived. The nonlinear ultrasonic testing system is used to detect received signals during tensile testing of for the specimen with Al2O3 coatings. It is found that when the stress is less than 260 MPa, the appearance of the coating has no obvious change, but the nonlinear coefficients measured by the experiment increase with the increase of the tensile stress. By comparing the curves of nonlinear coefficients and stress respectively, the fluctuation of curves the second-order nonlinear coefficient A2 and the relative nonlinear coefficient β′ to stress is relatively small, and close to the linear relationship with the tensile stress, which indicates that the two parameters of the specimen with Al2O3 coatings are more sensitive to the bonding conditions, and can be used as an evaluation method to track the coating damage.

scholarly journals Implementing the transvaginal ultrasound simulation training (TRUSST) programme for obstetric registrars

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Sally Byford ◽  
Sarah Janssens ◽  
Rachel Cook
Keyword(s):  
Early Pregnancy ◽  
Confidence Level ◽  
Simulation Training ◽  
Systematic Approach ◽  
Transvaginal Ultrasound ◽  
Skills Training ◽  
Ultrasound Simulation ◽  
Learning Gap ◽  
Assessment Scores ◽  
Simulation Based

Abstract Background Transvaginal ultrasound (TVUS) training opportunities are limited due to its intimate nature; however, TVUS is an important component of early pregnancy assessment. Simulation can bridge this learning gap. Aim To describe and measure the effect of a transvaginal ultrasound simulation programme for obstetric registrars. Materials and methods The transvaginal ultrasound simulation training (TRUSST) curriculum consisted of supported practice using virtual reality transvaginal simulators (ScanTrainer, Medaphor) and communication skills training to assist obstetric registrars in obtaining required competencies to accurately and holistically care for women with early pregnancy complications. Trainee experience of live transvaginal scanning was evaluated with a questionnaire. Programme evaluation was by pre-post self-reported confidence level and objective pre-post training assessment using Objective Structured Assessment of Ultrasound Skills (OSAUS) and modified Royal Australian and New Zealand College of Obstetrics and Gynaecology assessment scores. Quantitative data was compared using paired t tests. Results Fifteen obstetric registrars completed the programme. Numbers of performed live transvaginal ultrasound by trainees were low. Participants reported an increase in confidence level in performing a TVUS following training: mean pre score 1.6/5, mean post score 3/5. Objective assessments improved significantly across both OSAUS and RANZCOG scores following training; mean improvement scores 7.6 points (95% CI 6.2–8.9, p < 0.05) and 32.5 (95% CI 26.4–38.6, p < 0.05) respectively. It was noted that scores for a systematic approach and documentation were most improved: 1.9 (95% CI 1.4–2.5, p < 0.05) and 2.1 (95% CI 1.5–2.7, p < 0.05) respectively. Conclusion The implementation of a simulation-based training curriculum resulted in improved confidence and ability in TVUS scanning, especially with regard to a systematic approach and documentation.

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