Does standoff material affect acoustic radiation force impulse elastography? A preclinical study of a modified elastography phantom
Ultrasonography
;
: 140-148, 2018.
Article
in English
| WPRIM
| ID: wpr-731152
ABSTRACT
PURPOSE:
This study was conducted to determine the influence of standoff material on acoustic radiation force impulse (ARFI) measurements in an elasticity phantom by using two different probes.METHODS:
Using ARFI elastography, 10 observers measured the shear wave velocity (SWV, m/sec) in different lesions of an elasticity phantom with a convex 4C1 probe and a linear 9L4 probe. The experimental setup was expanded by the use of an interposed piece of porcine muscle as standoff material. The probe pressure on the phantom was registered.RESULTS:
Faulty ARFI measurements occurred more often when quantifying the hardest lesion (74.0 kPa 4.97 m/sec) by the 9L4 probe with the porcine muscle as a standoff material interposed between the probe and the phantom. The success rate for ARFI measurements in these series was 52.4%, compared with 99.5% in the other series. The SWV values measured with the 9L4 probe were significantly higher (3.33±1.39 m/sec vs. 2.60±0.74 m/sec, P < 0.001 in the group without muscle) and were closer to the reference value than those measured with the 4C1 probe (0.25±0.23 m/sec vs. 0.85±1.21 m/sec, P < 0.001 in the same group). The SWV values measured when using the muscle as a standoff material were lower than those without the muscle (significant for 9L4, P=0.040). The deviation from the reference value and the variance increased significantly with the 9L4 probe if the muscle was in situ (B=0.27, P=0.004 and B=0.32, P < 0.001). In our study, the pressure exerted by the operator had no effect on the SWV values.CONCLUSION:
The presence of porcine muscle acting as a standoff material influenced the occurrence of failed measurements as well as the variance and the accuracy of the measured values. The linear high-frequency probe was particularly affected.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Reference Values
/
Transducers
/
Acoustics
/
Ultrasonography
/
Elasticity
/
Elasticity Imaging Techniques
/
Muscles
Type of study:
Diagnostic study
Language:
English
Journal:
Ultrasonography
Year:
2018
Type:
Article
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