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Titel: Does standoff material affect acoustic radiation force impulse elastography? A preclinical study of a modified elastography phantom
VerfasserIn: Hollerieth, Katharina
Gaßmann, Bernhard
Wagenpfeil, Stefan
Kemmner, Stephan
Heemann, Uwe
Stock, Konrad Friedrich
Sprache: Englisch
Titel: Ultrasonography
Bandnummer: 37
Heft: 2
Seiten: 140-148
Verlag/Plattform: Korean Society of Ultrasound in Medicine
Erscheinungsjahr: 2018
Freie Schlagwörter: Elasticity imaging techniques
Ultrasonography
Standoff material
Muscles
Transducers
DDC-Sachgruppe: 610 Medizin, Gesundheit
Dokumenttyp: Journalartikel / Zeitschriftenartikel
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.
DOI der Erstveröffentlichung: 10.14366/usg.17002
URL der Erstveröffentlichung: https://www.e-ultrasonography.org/journal/view.php?doi=10.14366/usg.17002
Link zu diesem Datensatz: urn:nbn:de:bsz:291--ds-406931
hdl:20.500.11880/36578
http://dx.doi.org/10.22028/D291-40693
ISSN: 2288-5919
Datum des Eintrags: 9-Okt-2023
Fakultät: M - Medizinische Fakultät
Fachrichtung: M - Medizinische Biometrie, Epidemiologie und medizinische Informatik
Professur: M - Prof. Dr. Stefan Wagenpfeil
Sammlung:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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