Comparison of shear wave velocities on ultrasound elastography between different machines, transducers, and acquisition depths: a phantom study

Shin, Hyun Joo; Kim, Myung Joon; Kim, Ha Yan; Roh, Yun Ho; Lee, Mi Jung

doi:10.1007/s00330-016-4212-y

Cited by 105 publications

(131 citation statements)

References 29 publications

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“…Histologically, IM shows perivascular and/or perimysial and/or endomysial infiltration of inflammatory cells, often associated with perifascicular atrophy or microinfarcts. 22 The results of our study are in agreement with those of previous studies, which have shown that inflammatory lesions of the pancreas, bowel and uterus have relatively high SR. 20,23,24 Although the target organs were different in our study, there were similar histologic features. Chronic pancreatitis is characterized by pancreatic infiltration of inflammatory cells.…”

Section: Discussionsupporting

confidence: 93%

Strain sonoelastography of inflammatory myopathies: comparison with clinical examination, magnetic resonance imaging and pathologic findings

Song¹,

Lee²,

Yoo³

et al. 2016

BJR

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were assessed with SSE after MRI. The ratio of strain in the target muscle (A) and a nearby normal muscle (B), defined as the strain index value (SR) (B/A), was calculated automatically. Elastograms were assigned an elasticity score according to the degree and distribution of strain induced by manual compression. Ultrasonography and MRI were analyzed in conjunction with clinical information, biochemical data, final clinical diagnosis and grading of pathology. Correlations between SR and qualitative analyses of MRI and ultrasonography, elasticity score, biochemical data and final clinical diagnosis were analyzed using Pearson's correlation coefficient.Results: The SR of the target muscles was high in patients with IM (mean 3.14; range, 0.95-5.93 6 1.42). The correlations between SR and pathologic grading and elasticity score were statistically significant (p , 0.05). There was no significant agreement between SR and other clinical and radiologic parameters. Conclusion: Muscle hardness, as semi-quantitatively measured by SSE, was increased in cases of IM. The correlation between the SR and the pathologic grading suggests that SSE could be an important tool in not only the diagnosis of but also in measuring the degree of muscular inflammation. Advances in knowledge: This work describes a correlation between tissue elasticity and pathology in IM.

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Section: Discussionsupporting

confidence: 93%

Strain sonoelastography of inflammatory myopathies: comparison with clinical examination, magnetic resonance imaging and pathologic findings

Song¹,

Lee²,

Yoo³

et al. 2016

BJR

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“…These tasks could be faced by many clinical imaging physicists nowadays. Systemic differences were shown among different transducers and vendors, which were similarly observed in the literature 18, 21, 22…”

Section: Discussionsupporting

confidence: 79%

Clinical acceptance testing and scanner comparison of ultrasound shear wave elastography

Long

Tradup

Song

et al. 2018

J Applied Clin Med Phys

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Because of the rapidly growing use of ultrasound shear wave elastography (SWE) in clinical practices, there is a significant need for development of clinical physics performance assessment methods for this technology. This study aims to report two clinical medical physicists’ tasks: (a) acceptance testing (AT) of SWE function on ten commercial ultrasound systems for clinical liver application and (b) comparison of SWE measurements of targets across vendors for clinical musculoskeletal application. For AT, ten GE LOGIQ E9 XDclear 2.0 scanners with ten C1‐6‐D and ten 9L‐D transducers were studied using two commercial homogenous phantoms. Five measurements were acquired at two depths for each scanner/transducer pair by two operators. Additional tests were performed to access effects of different coupling media, phantom locations and operators. System deviations were less than 5% of group mean or three times standard deviation; therefore, all systems passed AT. A test protocol was provided based on results that no statistically significant difference was observed between using ultrasound gel and salt water for coupling, among different phantom locations, and that interoperator and intraoperator coefficient of variation was less than 3%. For SWE target measurements, two systems were compared — a Supersonic Aixplorer scanner with a SL10‐2 and a SL15‐4 transducer, and an abovementioned GE scanner with 9L‐D transducer. Two stepped cylinders with diameters of 4.05–10.40 mm were measured both longitudinally and transaxially. Target shear wave speed quantification was performed using an in‐house MATLAB program. Using the target shear wave speed deduced from phantom specs as a reference, SL15‐4 performed the best at the measured depth. However, it was challenging to reliably measure a 4.05 mm target for either system. The reported test methods and results could provide important information when dealing with SWE‐related tasks in the clinical environment.

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“…They postulate that the difference between the probes might be due to the fact that the number of elements and channels differs between both transducers and that the beam profile is shaped slightly different over depth. Shin et al showed that differences between pSWE vs. Supersonic shear imaging (SSI)™ values (Aixplorer ultrasound system, SuperSonic Imagine, Aix-en-Provence, France) depended not only on the transducers but also on US machines from different vendors (e.g., with different F-number and the frame rate of imaging) [22]. pSWE values assessed in our elasticity phantom study with the Method 3 (Epiq7, C5-1 convex probe) were slightly higher than those recorded with Methods 1 and 2 (Acuson S3000, 9L4 linear probe and 4C1 convex probe.…”

Section: Discussionmentioning

confidence: 99%

“…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%

“…Studies are needed to investigate the impact of different SWE systems and the optimal placement of the potentially variable region of interest (vROI) of measurement accuracy. This first point was investigated in several papers [19][20][21][22]. Basic phantom studies -enabling the formulation of valid statements regarding the second point -are not yet available.…”

Section: Introductionmentioning

confidence: 99%

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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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Comparison of shear wave velocities on ultrasound elastography between different machines, transducers, and acquisition depths: a phantom study

Abstract: • The shear wave velocities (SWVs) are different between different ultrasound elastography machines • The SWVs are also different between different transducers and acquisition depths • Caution is needed when using the cutoff SWVs measured under different conditions.

Cited by 105 publications

References 29 publications

Strain sonoelastography of inflammatory myopathies: comparison with clinical examination, magnetic resonance imaging and pathologic findings

Strain sonoelastography of inflammatory myopathies: comparison with clinical examination, magnetic resonance imaging and pathologic findings

Clinical acceptance testing and scanner comparison of ultrasound shear wave elastography

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

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