Ultrasound elastography – Review

Redhu, Navneet; Rastogi, D.; Yadav, Anurag; Hariprasad, Sudarsan; Jigar, Z.; Tripathi, Sudhir; Gupta, Shivani; Chawla, Deepak

doi:10.1016/j.cmrp.2015.03.007

Cited by 10 publications

(6 citation statements)

References 24 publications

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“…Elastography is an established technique for quantitatively obtaining biomechanical properties of tissue by using an imaging modality to detect displacements. Traditional elastographic techniques such as ultrasound elastography (USE) 35 , 36 and magnetic resonance elastography (MRE) 37 , 38 are clinically available tools for detecting diseases such as hepatic fibrosis 39 and breast cancer. 40 However, these techniques require relatively large displacement amplitudes and have poor spatial and temporal resolutions, which limit their use for small and thin samples such as ocular tissues.…”

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confidence: 99%

Evaluating the Effects of Riboflavin/UV-A and Rose-Bengal/Green Light Cross-Linking of the Rabbit Cornea by Noncontact Optical Coherence Elastography

Singh

Han

et al. 2016

Invest. Ophthalmol. Vis. Sci.

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PurposeThe purpose of this study was to use noncontact optical coherence elastography (OCE) to evaluate and compare changes in biomechanical properties that occurred in rabbit cornea in situ after corneal collagen cross-linking by either of two techniques: ultraviolet-A (UV-A)/riboflavin or rose-Bengal/green light.MethodsLow-amplitude (≤10 μm) elastic waves were induced in mature rabbit corneas by a focused air pulse. Elastic wave propagation was imaged by a phase-stabilized swept source OCE (PhS-SSOCE) system. Corneas were then cross-linked by either of two methods: UV-A/riboflavin (UV-CXL) or rose-Bengal/green light (RGX). Phase velocities of the elastic waves were fitted to a previously developed modified Rayleigh-Lamb frequency equation to obtain the viscoelasticity of the corneas before and after the cross-linking treatments. Micro-scale depth-resolved phase velocity distribution revealed the depth-wise heterogeneity of both cross-linking techniques.ResultsUnder standard treatment settings, UV-CXL significantly increased the stiffness of the corneas by ∼47% (P < 0.05), but RGX did not produce statistically significant increases. The shear viscosities were unaffected by either cross-linking technique. The depth-wise phase velocities showed that UV-CXL affected the anterior ∼34% of the corneas, whereas RGX affected only the anterior ∼16% of the corneas.ConclusionsUV-CXL significantly strengthens the cornea, whereas RGX does not, and the effects of cross-linking by UV-CXL reach deeper into the cornea than cross-linking effects of RGX under similar conditions.

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confidence: 99%

Evaluating the Effects of Riboflavin/UV-A and Rose-Bengal/Green Light Cross-Linking of the Rabbit Cornea by Noncontact Optical Coherence Elastography

Singh

Han

et al. 2016

Invest. Ophthalmol. Vis. Sci.

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“…Tissue stiffness correlates with the propagation speed of the shear waves with faster propagation speed present in stiffer tissues. 13 Elastography was shown to have a similar accuracy for the assessment of liver fibrosis as biopsy and is considered an alternative method for liver fibrosis in people. 14 There are multiple recent studies evaluating the role of shear wave elastography in veterinary medicine, including the liver in healthy dogs 15 and cats 16 as well as hepatic fibrosis in dogs.…”

Section: Introductionmentioning

confidence: 99%

Shear wave elastography evaluation of cats with chronic kidney disease

Appleby

Vaden

Monteith

et al. 2022

Vet Radiology Ultrasound

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Chronic kidney disease (CKD) is a major health condition in cats that can lead to poor quality of life and financial implications for therapy. Currently staging and identification of CKD is limited by diagnostic testing such as creatinine and urine‐specific gravity, which do not change until late in the disease course. Other methods to evaluate CKD would be valuable in the clinical setting. Shear wave elastography is one novel ultrasound method, which has shown promise in identifying increases in tissue stiffness and identifying CKD in people. As CKD is often histologically characterized by tubulointerstitial fibrosis, shear wave elastography has the potential to identify CKD and differentiate between stages of CKD in cats. This prospective observational case‐control study with 78 cats found no difference in shear wave velocities between groups (P = 0.33), a contradictory finding to one prior publication. There was no effect of weight (P = 0.65), nor the presence of mineralization (P = 0.31) or infarction (P = 0.52) on cortical shear wave velocities. There was a significant effect of age on shear wave velocity (P = 0.018) where velocities increased with age. The intraclass correlation coefficient was only moderate (0.62). Possible reasons for the difference in results between our work and that published prior, include differences in methodology and differences in instrumentation. Variability in measurements in our population may be due to the effects of respiratory motion or limitations in shear wave elastography software. As such, shear wave elastography is not currently recommended as a tool to evaluate CKD in cats and further work is necessary.

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“…The primary markers used are the evaluation of the patient, evaluation of maternal signs and symptoms (menstrual‐like cramping, mild‐irregular contractions, low backache, pressure sensation in the vagina or pelvis), clinical examination, evaluation of cervical length with biochemical indicators and ultrasonography 3,4 . Ultrasound elastography has become an increasingly common method, which is an imaging technique that assesses the elastic properties of soft tissues 5 . It can be used in many organs to evaluate a variety of diseases.…”

Section: Introductionmentioning

confidence: 99%

“…3,4 Ultrasound elastography has become an increasingly common method, which is an imaging technique that assesses the elastic properties of soft tissues. 5 It can be used in many organs to evaluate a variety of diseases. There are very few studies with elastographic examinations about preterm labor in the literature.…”

Section: Introductionmentioning

confidence: 99%

Can placental elasticity predict the time of delivery in cases of threatened preterm labor?

Tolunay

Eroğlu

Çelik

et al. 2020

J of Obstet and Gynaecol

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Aim We aimed to evaluate placental elasticity for the short‐time prediction of delivery in cases of threatened preterm labor (TPL). Methods We performed a prospective study with consented pregnant women diagnosed with TPL (24th to 34th gestational week). According to the birth time, the patients were grouped into two groups, whether the delivery happened in the following first week or not. We compared the placental strain ratio (PSR) values between these two groups. Results A total of 108 pregnant women divided into two groups according to the delivery time were enrolled in our study. The pregnant women who had a delivery in 1 week after hospitalization have increased PSR values when compared to those who have not delivered within 1 week (P < 0.001). Multivariate logistic regression analysis showed that cervical length and PSR were significantly associated with delivery in 1 week after hospitalization. When the cervical length was entered as a covariate (control) variable, PSR was significantly associated with delivery time (B = 0.504, odds ratio: 1.655, 95% confidence interval: 1.339–2.045, P < 0.001). A PSR value of 4.04 had a sensitivity of 77.78% and a specificity of 87.04% in terms of short‐time prediction of the delivery time, in the receiver–operator curves analysis to determine the cut‐off point PSR value. Conclusion Elastography may contribute to predict the delivery time in high‐risk pregnants with TPL.

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Ultrasound elastography – Review

Cited by 10 publications

References 24 publications

Evaluating the Effects of Riboflavin/UV-A and Rose-Bengal/Green Light Cross-Linking of the Rabbit Cornea by Noncontact Optical Coherence Elastography

Evaluating the Effects of Riboflavin/UV-A and Rose-Bengal/Green Light Cross-Linking of the Rabbit Cornea by Noncontact Optical Coherence Elastography

Shear wave elastography evaluation of cats with chronic kidney disease

Can placental elasticity predict the time of delivery in cases of threatened preterm labor?

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