scholarly journals VP15.21: Feasibility and efficacy of longitudinal strain measurement in fetal heart using two‐dimensional tissue tracking

2020 ◽  
Vol 56 (S1) ◽  
pp. 118-118
Author(s):  
S. Miyashita ◽  
S. Ochiai ◽  
C. Sakamoto ◽  
E. Motegi ◽  
K. Tada ◽  
...  
Keyword(s):  
Strain Measurement ◽  
Longitudinal Strain ◽  
Fetal Heart ◽  
Two Dimensional ◽  
Tissue Tracking

An electronic speckle pattern interferometer for two-dimensional strain measurement

1996 ◽  
Vol 7 (12) ◽  
pp. 1740-1747 ◽  
Author(s):  
Andrew J Moore ◽  
Margaret Lucas ◽  
John R Tyrer
Keyword(s):  
Strain Measurement ◽  
Speckle Pattern ◽  
Two Dimensional

The Elastic Moduli of Silver Thin Films Measured with a New Microtensile Tester

1991 ◽  
Vol 239 ◽  
Author(s):  
J. Ruud ◽  
D. Josell ◽  
A. L. Greer ◽  
F. Spaepen
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Diffraction Grating ◽  
Strain Measurement ◽  
Elastic Moduli ◽  
Two Dimensional ◽  
Bulk Crystals ◽  
Free Standing ◽  
Tensile Direction ◽  
Silver Thin Films

ABSTRACTA new design for a thin film microtensile tester is presented. The strain is measured directly on the free-standing thin film from the displacement of laser spots diffracted from a thin grating applied to its surface by photolithography. The diffraction grating is two-dimensional, allowing strain measurement both along and transverse to the tensile direction. In principle, both Young's modulus and Poisson's ratio of a thin film can be determined. Ag thin films with strong <111> texture were tested. The measured Young moduli agreed with those measured on bulk crystals, but the measured Poisson ratios were low, most likely due to slight transverse folding of the film that developed during the test.

scholarly journals A Review of Surface Deformation and Strain Measurement Using Two-Dimensional Digital Image Correlation

2016 ◽  
Vol 23 (3) ◽  
pp. 461-480 ◽  
Author(s):  
Sze-Wei Khoo ◽  
Saravanan Karuppanan ◽  
Ching-Seong Tan
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
Strain Measurement ◽  
Surface Deformation ◽  
Optical Measurement ◽  
Image Correlation ◽  
Two Dimensional ◽  
Full Field ◽  
Computation Efficiency ◽  
Dimensional Measurements

Abstract Among the full-field optical measurement methods, the Digital Image Correlation (DIC) is one of the techniques which has been given particular attention. Technically, the DIC technique refers to a non-contact strain measurement method that mathematically compares the grey intensity changes of the images captured at two different states: before and after deformation. The measurement can be performed by numerically calculating the displacement of speckles which are deposited on the top of object’s surface. In this paper, the Two-Dimensional Digital Image Correlation (2D-DIC) is presented and its fundamental concepts are discussed. Next, the development of the 2D-DIC algorithms in the past 33 years is reviewed systematically. The improvement of 2DDIC algorithms is presented with respect to two distinct aspects: their computation efficiency and measurement accuracy. Furthermore, analysis of the 2D-DIC accuracy is included, followed by a review of the DIC applications for two-dimensional measurements.

Design of SAW sensor for longitudinal strain measurement with improved sensitivity

2018 ◽  
Vol 25 (1) ◽  
pp. 351-359
Author(s):  
Juan Ren ◽  
Kanat Anurakparadorn ◽  
Hairong Gu ◽  
Minghui Zhao ◽  
Xueyong Wei
Keyword(s):  
Strain Measurement ◽  
Longitudinal Strain ◽  
Saw Sensor

Abstract 14760: Right Ventricular Function in Preterm Neonates: Reference Values for Longitudinal Strain by Two-dimensional Speckle Tracking Echocardiography From Birth to One Year of Life

Circulation ◽  
2015 ◽  
Vol 132 (suppl_3) ◽  
Author(s):  
Philip T Levy ◽  
Meghna D Patel ◽  
Mark R Holland ◽  
Timothy J Sekarski ◽  
Amit Mathur ◽  
...  
Keyword(s):  
Preterm Infants ◽  
Premature Infants ◽  
Reference Values ◽  
Speckle Tracking ◽  
Longitudinal Strain ◽  
Speckle Tracking Echocardiography ◽  
Systolic Function ◽  
Free Wall ◽  
Two Dimensional ◽  
One Year

Introduction: Right ventricle (RV) systolic function is an important determinant of cardiopulmonary outcomes in premature infants. Two-dimensional speckle tracking echocardiography (2DSTE) derived myocardial strain is a reliable measure of RV systolic function in premature infants, but lacks reference values for clinical application in premature infants. We aimed to determine the maturational (age- and weight- related) changes in RV strain to establish reference values in preterm infants from birth to one year corrected age (CA). Methods: RV peak global longitudinal strain (pGLS) and RV free wall longitudinal strain (FWLS) were measured in a prospective longitudinal study in 115 preterm infants (< 29 weeks at birth) at 24 and 72 hours of age (HOA), 32 and 36 weeks postmenstrual age (PMA), and one year (CA) by 2DTSE (GE EchoPac) from a RV-focus apical 4-chamber view using a validated protocol. Premature infants that developed chronic lung disease or had a hemodynamically significant PDA were excluded (n=65) from analysis for the reference values. Results: RV pGLS ranged from -16% at birth to -26% by one year CA and RV FWLS ranged from -18% at birth to -27% to one year CA in healthy preterm infants. RV pGLS and FWLS strain correlated with increasing weight (r=0.87, p < 0.001), PMA in weeks (r=0.85, p < 0.001; r=0.83, p < 0.001), but were independent of gestational age at birth (r=0.4, p=0.38; r=0.3, p=0.5). RV strain was significantly lower in preterm infants with bronchopulmonary dysplasia (p=0.004) at 32 and 36 weeks PMA, and one year CA (Figure). RV strain was independent of gender or need for mechanical ventilation. Conclusions: This study establishes reference values of RV global and free wall longitudinal strain and tracks their postnatal maturational changes in preterm infants. These measures increase from birth to one year CA and are linearly associated with increasing weight reflecting the postnatal cardiac growth as a contributor to the maturation of RV function.

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