Sources of Variability in Shear Wave Speed and Dispersion Quantification with Ultrasound Elastography: A Phantom Study
| Autor: | Naiara Korta Martiartu, Iara Nascimento Kirchner, Lisa Ruby, Marga B. Rominger, Catherine Paverd, Davide Cester, Thomas Frauenfelder, Sherin Nambiar |
|---|---|
| Přispěvatelé: | University of Zurich, Korta Martiartu, Naiara |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Acoustics and Ultrasonics
Acoustics Biophysics 610 Medicine & health Imaging phantom Region of interest Ultrasound elastography medicine 3102 Acoustics and Ultrasonics Radiology Nuclear Medicine and imaging Dispersion (water waves) 3614 Radiological and Ultrasound Technology Ultrasonography Radiological and Ultrasound Technology medicine.diagnostic_test Phantoms Imaging business.industry 10042 Clinic for Diagnostic and Interventional Radiology Ultrasound Ranging Elasticity Shear (sheet metal) Liver Elasticity Imaging Techniques Elastography business Geology 1304 Biophysics |
| Popis: | There is a growing interest in quantifying shear-wave dispersion (SWD) with ultrasound shear-wave elastography (SWE). Recent studies suggest that SWD complements shear-wave speed (SWS) in diffuse liver disease diagnosis. To accurately interpret these metrics in clinical practice, we analyzed the impact of operator-dependent acquisition parameters on SWD and SWS measurements. Considered parameters were the acquisition depth, lateral position and size of the region of interest (ROI), as well as the size of the SWE acquisition box. Measurements were performed using the Canon Aplio i800 system (Canon Medical Systems, Otawara, Tochigi, Japan) and four homogeneous elasticity phantoms with certified stiffness values ranging from 3.7 to 44 kPa. In general, SWD exhibited two to three times greater variability than SWS. The acquisition depth was the main variance-contributing factor for both SWS and SWD, which decayed significantly with depth. The lateral ROI position contributed as much as the acquisition depth to the total variance in SWD. Locations close to the initial shear-wave excitation pulse were more robust to biases because of inaccurate probe-phantom coupling. The size of the ROI and acquisition box did not introduce significant variations. These results suggest that future guidelines on multiparametric elastography should account for the depth- and lateral-dependent variability of measurements. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|