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Influence of Probe Pressure on Ultrasound-Based Shear Wave Elastography of the Liver Using Comb-Push 2-D Technology
Umeå University, Faculty of Medicine, Department of Nursing.ORCID iD: 0000-0001-9338-1639
Umeå University, Faculty of Medicine, Department of Nursing.ORCID iD: 0000-0002-1248-5581
2019 (English)In: Ultrasound in Medicine and Biology, ISSN 0301-5629, E-ISSN 1879-291X, Vol. 45, no 2, p. 411-428Article in journal (Refereed) Published
Abstract [en]

It has been postulated that in the liver, applying increased probe pressure during ultrasound-based shear wave elastography (SWE) might lead to a false increase in the SWE result. We aimed to determine the influence of increased intercostal probe pressure when performing SWE of the liver. We also investigated the number of measurements required to achieve technically successful and reliable SWE examinations. This prospective, clinical study included 112 patients and 2240 SWE measurements of the liver. We applied probe pressure intercostally, to reduce the skin-to-liver capsule distance (SCD), which could stabilize the SWE signal and thus increase the number of technically successful measurements. We performed 10 measurements with maximum probe pressure and 10 with normal pressure in each patient. Thus, two analysis groups were compared for differences. Compared with normal pressure, maximum probe pressure significantly reduced the SCD (p < 0.001) and significantly increased the number of technically successful measurements from 981 to 1098, respectively (p < 0.001). The SWE results with normal and maximum probe pressure were 5.96 kPa (interquartile range: 2.41) and 5.45 kPa (interquartile range: 1.96), respectively (p < 0.001). In obese patients, a large SCD poses a diagnostic challenge for ultrasound SWE. We found that maximum intercostal probe pressure could reduce the SCD and increase the number of technically successful measurements, without falsely increasing the SWE result. Only three measurements were required to achieve technically successful and reliable SWE examinations.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 45, no 2, p. 411-428
Keywords [en]
Shear wave elastography, Skin-to-liver capsule distance, Probe pressure, Measurements, Obesity, Pre-compressive force, Applied transducer force, Subcutaneous fat, Steatosis
National Category
Radiology, Nuclear Medicine and Medical Imaging Nursing
Research subject
Radiology
Identifiers
URN: urn:nbn:se:umu:diva-153992DOI: 10.1016/j.ultrasmedbio.2018.09.023ISI: 000454875400012PubMedID: 30401508Scopus ID: 2-s2.0-85055907154OAI: oai:DiVA.org:umu-153992DiVA, id: diva2:1269704
Available from: 2018-12-11 Created: 2018-12-11 Last updated: 2019-06-27Bibliographically approved

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Byenfeldt, MarieFransson, Per

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