Reproducibility of shear wave elastography among operators, machines, and probes in an elasticity phantom

Alrashed, Abdulaziz Ibrahim; Alfuraih, Abdulrahman M.

doi:10.14366/usg.20011

Cited by 21 publications

(23 citation statements)

References 35 publications

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“…Similarly, the variability significantly increased at depths of five cm and seven cm (p < 0.001). These findings concurred with what has been reported in other studies in terms of the remarkable effect of depth on elasticity measurements [12][13][14][15]18,26]. These results would therefore suggest that pSWE measurements should be taken at a depth of no more than 4 cm, as beyond this depth, the variability would significantly increase.…”

Section: Discussionsupporting

confidence: 92%

“…However, in the aforementioned study, the depth level investigated was limited to a range between 1 and 4 cm. On the other hand, studies using more depth ranges of up to 6 cm have shown evidence for depth dependency with measurements [12,25,26]. In the previous studies, although the measurements were recorded in phantom settings, the shear wave technology used is different from the one in our study (2D-SWE vs. pSWE).…”

Section: Discussioncontrasting

confidence: 54%

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Effect of Depth on Ultrasound Point Shear Wave Elastography in an Elasticity Phantom

et al. 2022

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Background: Phantom studies are widely used to assess variability in measurements. This study aimed to assess the reliability and accuracy of point Shear Wave elastography (pSWE) measurements of an elasticity phantom. Methods: Measurements were obtained by an experienced certified clinical sonographer at three different depth levels in kPa, using a curvilinear 5-1MHz transducer of the EPIQ7 ultrasound imaging system. Results: A total of 180 pSWE measurements were obtained at three different depth levels (three cm, five cm, and seven cm) of the phantom background. The mean CV of pSWE was low at all depths (3 cm: 8.8%; 5 cm: 7%; 7 cm: 7.2%). There was a significant difference between measurements at depths of 3 cm vs. 7 cm (MD: −0.85, 95% CI −1.5, −0.11, p = 0.024) and measurements at depths 5 cm vs. 7 cm (MD: −1.1, 95% CI −1.7, −0.47, p = 0.001). An overestimation of mean pSWE measurements at a depth of 7 cm was noted compared to the manufacturer’s value (2.7%, p = 0.006). Conclusions: Superficial phantom SWE measurements in this study had low variability compared to deep measurement. pSWE measurements at deep levels can be overestimated.

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Section: Discussionsupporting

confidence: 92%

Section: Discussioncontrasting

confidence: 54%

Effect of Depth on Ultrasound Point Shear Wave Elastography in an Elasticity Phantom

et al. 2022

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“…Some studies concerning splenic stiffness in children with chronic liver disease provide normal values in small control groups, but these were obtained from US machines from various manufacturers, thus compromising any reliable comparison of the values [ 6 , 18 ]. Splenic stiffness measurements from these manufacturers were either expressed in kilopascal (kPa), e.g., with a median of 17.85±1.3 kPa on 10 children ages 4 to 14 years [ 5 ], or expressed both in kPa and m/s, e.g., with a median of 16.8 kPa (1.6–22.8 kPa) and 2.4 m/s (2.0–2.7 m/s) in 37 patients (0.5–18.5 years) [ 19 ].…”

Section: Discussionmentioning

confidence: 99%

Acoustic radiation force impulse imaging: normal values of spleen stiffness in healthy children

et al. 2021

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Background Acoustic radiation force impulse (ARFI) imaging is a noninvasive ultrasound elastography technique for evaluating tissue stiffness. The association of liver and spleen stiffness provides additional information in the assessment of portal hypertension. The technique and normal values of spleen stiffness by point shear wave elastography (p-SWE) in pediatrics have not been well documented. Objective Our aim is to describe the feasibility and normal ARFI elastography values in the spleen for healthy children and to compare measurements in two different probe positions (the axial and sagittal planes). Materials and methods Spleen p-SWE using ARFI values were measured with a 6C1 probe in 102 healthy children (age range: 8 weeks to 17 years) divided into four age groups. An average of nine (standard deviation: two) spleen stiffness measurements were taken during free breathing in each plane (axial and sagittal). The impact of age and measurement plane in the spleen was analyzed using multivariate models. Results There was no significant difference in spleen stiffness values taken at different ages, with an average of the medians of 2.43±0.31 m/s. There was no significant difference based on probe orientation: sagittal plane (median: 2.46±0.29 m/s) and axial plane (median: 2.43±0.32 m/s) with Student’s t-test P=0.18. The mean depth of measurement varied between 2.3 cm and 3.7 cm, according to age. Conclusion Normal spleen stiffness values using ARFI imaging in children do not vary with age and correspond to a median of 2.43 m/s. No significant difference was found when using different probe positions.

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Section: Introductionmentioning

confidence: 99%

“…In order to evaluate the reproducibility of various elastographic techniques, both phantom and clinical studies have been designed [9][10][11]. Of these, some assessed machine dependent variability for SWE [9,[12][13][14]. Other studies evaluated intra-and interobserver variability of different elastographic techniques in a clinical setting [11,[15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Inter- and intraobserver reproducibility of Strain and 2D Shear Wave Elastography – a phantom study

et al. 2021

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Aims: To analyse the intra- and interobserver variability of two elastographic methods of quantification available on the same machine, the technical factors that may influence variability as well as the intra- and interobserver variability for the same indices between two different ultrasound machines in an in vitro experimental setting.Material and methods: Three different types of silicone experimental devices (ED) were conceived for the purpose of this study. Two observers performed repeated measurements on two ultrasound machines. Strain elastography, with strain ratio determination between the ED was performed on both machines. Shear wave ratio was also assessed. The data obtained were used to calculate intra- and interobservervariability. Reproducibility was assessed in relation to the size of the elastographic region of interest (ROI) and to the difference in stiffness between the ED, through the value of the ICCs (Intraclass Correlation Coefficient).Results: Strain ratio had high inter- and intraobserver reproducibility, regardless of the machine used, on a large number of determinations.The choice of a small ROI diameter (5 mm) over a large ROI diameter (15mm) increased reproducibility (ICC = 0.87 vs 0.78, p=0.000). It is observed that, by Shear Wave Elastography, only when analysing structures with a large difference in hardness, significance is obtained in terms of interobserver reproducibility (ICC = 0.75, p=0.000).Conclusions: On a large number of determinations, both techniques are inter- and intraobserver reproducible. It is preferable to opt for a smaller ROI diameter in order to increase interobserver reproducibility. SWE Ratio provides significant reproducibility only when analysing structureswith large difference in hardness.

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Reproducibility of shear wave elastography among operators, machines, and probes in an elasticity phantom

Cited by 21 publications

References 35 publications

Effect of Depth on Ultrasound Point Shear Wave Elastography in an Elasticity Phantom

Effect of Depth on Ultrasound Point Shear Wave Elastography in an Elasticity Phantom

Acoustic radiation force impulse imaging: normal values of spleen stiffness in healthy children

Inter- and intraobserver reproducibility of Strain and 2D Shear Wave Elastography – a phantom study

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