Variability of Shear Wave Velocity using Different Frequencies in Acoustic Radiation Force Impulse (ARFI) Elastography: A Phantom and Normal Liver Study

Chang, Suyon; Kim, M.-J.; Kim, J.; Lee, Mi Jung

doi:10.1055/s-0032-1313008

Cited by 64 publications

(85 citation statements)

References 14 publications

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“…The considerable variability of stiffness value measurements of 80 kPa targets was previously reported and proved to be independent of operators' experience levels [20,30,31].…”

Section: Discussionmentioning

confidence: 53%

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Intra- and inter-observer variation and accuracy using different shear wave elastography methods to assess circumscribed objects – a phantom study.

Seliger

Chaoui

Kunze³

et al. 2017

Med Ultrason

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Aims: The elastic properties of circumscribed tissues (e.g., tendons, lymph nodes, prostates, brain tumors) are of considerable clinical interest. The purpose of this study was thus to compare the Intra-/Inter-observer variation and accuracy in vitro of point shear wave elastography (pSWE) with that of 2D-SWE and to assess 2D-SWE’s precision with variable ROI (vROI) incircumscribed objects.Material and methods: Round targets (Elasticity QA Phantom Model 049) were examined for varying degrees of stiffness (8, 14, 45, and 80 kPa) and diameters (20/10 mm). Three ultrasound systems and four probes were applied (pSWE: Acuson/S3000 9L4/4C1 and Epiq7 C51, 2D-SWE: Aplio/500 PVT375BT). Three different ROIs were used, namely fixed ROI (fROI) and variable ROI: rectangular-best-fitted ROI, and round-best-fitted ROI. Each measurement was performed twice by four observers.Results: A total of 3,604 measurements were conducted. The intra-observer variation of 2D-SWE measurements indicated better agreement (Intraclass Correlation Coefficient (ICC) = 0.971; 95% CI=[0.945; 0.985]), than for the pSWE measurements (ICC = 0.872; 95% CI=[0.794; 0.92]). With both methods, the shear wave elastography applied showed low inter-observer variation: ICC = 0.980; 95% CI=[0.970; 0.987]. However, a significant difference was observed between fROI (pSWE) and vROI (2D-SWE) on circumscribed objects in terms of accuracy. The lowest degree of observationerror was detected in situations where the ROI was not “best fitted”, but placed within the target of 3mm from the border (target diameter: 20mm; mean relative error = 0.15).Conclusions: When estimating the elastic properties of circumscribed tissues, the different measurement techniques performed by commercial shear wave elastography systems reveal a strong susceptibility for observational errors, depending upon the fixed vs. variable ROI of the pSWE vs. 2D-SWE technique.

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“…The considerable variability of stiffness value measurements of 80 kPa targets was previously reported and proved to be independent of operators' experience levels [20,30,31].…”

Section: Discussionmentioning

confidence: 53%

“…Hence, the measurement procedure in the second part of the study was repeated five times for each target type, with the stiffness value defined as the mean of the five measurements for each ROI diameter (diameters: 40, 38, 36, 34,32,30,28,26,24,22,20,18,16,14,12,10,8,6, 4 and 2 mm).…”

Section: Study Design -Measurement Proceduresmentioning

confidence: 99%

Intra- and inter-observer variation and accuracy using different shear wave elastography methods to assess circumscribed objects – a phantom study.

Seliger

Chaoui

Kunze³

et al. 2017

Med Ultrason

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“…In ARFI, the power of the force applied on the transducer by the operator [18,41,42], the distance from source to target [21,27,34,42] -in current imaging methods is important as is the maximal depth is 8 cm [8], and also the frequency of the probe [42,43], all of these being potential modifiers of measured shear wave velocity. Furthermore, placement of the probe on the cortex may be difficult in advanced CKD because of a small cortical parenchyma thickness.…”

Section: Evaluating Fibrosis In Native Kidney With Us Elastographymentioning

confidence: 99%

Value of ultrasound elastography in the diagnosis of native kidney fibrosis.

et al. 2016

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In the last decade ultrasound elastography, an already widely used technique in the diagnosis of hepatic fibrosis, has raised the attention of nephrologists as a potential valuable noninvasive tool for the diagnosis of renal fibrosis. Due to renal deep location and anatomic complexity, the shear wave techniques are the most appropriate elastography methods for exploring native kidneys. Recent research offers promising results, but further larger studies are required for a better standardization of this method and also for establishing reference values of normal kidney elasticity. This article reviews the studies conducted for exploring the native kidney, highlighting the advantages and limitations of ultrasound elastography for assessing fibrosis development in chronic kidney diseases.

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“…Increasingly, new areas of usage for this novel imaging modality are being described in the literature. To improve the utility of this method, particularly in the diagnosis of pathological tissues, the elasticity values of normal soft tissues [1][2][3][4][5][6] or comparisons between normal and pathological tissues have been described by recent reports [7]. Additionally, the characterization and/or differentiation of pathological tissues by US elastography have increasingly been evaluated by numerous up-to-date studies that aimed to reveal the diagnostic efficacy of US elastography in differentiating benign or malignant conditions.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Radiation Force Impulse (ARFI) elastography quantification of muscle stiffness over a course of gradual isometric contractions: a preliminary study.

et al. 2015

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Aims: To evaluate the feasibility of quantitative analysis of muscle stiffness by Acoustic Radiation Forced Impulse (ARFI) elastography over a course of graduate isometric voluntary contractions. Material and methods: The stiffness of the bilateral biceps muscle of 13 healthy volunteers was measured in real time by ARFI elastography, while the forearm was in neutralextended position, 90 degree self-flexed positions and 90 degree self-flexed position, with altered weights ranging from 1 to 8 kg placed on flattened palmar surfaces consecutively. The determined increases in biceps muscle stiffness were measured for both arms and correlated with the loadings weights adopted at progressive trial stages. Results: The mean shear wave velocity (SWV) values of biceps muscles in a neutral position, in 90 degree flex position and 90 degree flex position with 1 to 8 kg weights on palmar surfaces were 2.162±0.302 m/sec, 3.382±0.581 m/sec, and 3.897±0.585 to 5.562±0.587 m/sec, respectively. Significant correlations between the muscle SWV values and related palmar weights and between the SWV values of right and left sides at different trial stages were identified (r=0.951 and r=0.954, respectively). A mutual propagation path of deep regions to entire areas was described to account for the distribution of increase in stiffness with increases in palmar weights. The confidence of method regarding inter-observer difference was confirmed by the correlation analyses of the results (r=0.998). Conclusions: ARFI elastography is a feasible imaging modality for quantifying the stiffness of isometrically voluntarily contracting muscles.Keywords: Acoustic Radiation Force Impulse, elastography, muscle stiffness Acoustic Radiation Force Impulse (ARFI) elastography quantification of muscle stiffness over a course of gradual isometric contractions: a preliminary study.

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Variability of Shear Wave Velocity using Different Frequencies in Acoustic Radiation Force Impulse (ARFI) Elastography: A Phantom and Normal Liver Study

Cited by 64 publications

References 14 publications

Intra- and inter-observer variation and accuracy using different shear wave elastography methods to assess circumscribed objects – a phantom study.

Intra- and inter-observer variation and accuracy using different shear wave elastography methods to assess circumscribed objects – a phantom study.

Value of ultrasound elastography in the diagnosis of native kidney fibrosis.

Acoustic Radiation Force Impulse (ARFI) elastography quantification of muscle stiffness over a course of gradual isometric contractions: a preliminary study.

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