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Two-dimensional shear-wave elastography (2D-SWE) shows comparable liver stiffness measurements to point shear-wave elastography (pSWE) in cirrhotic patients but takes longer. 2D-SWE results are reliable with multiple measurements, regardless of region size.

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Area of Science:

  • Medical Imaging
  • Hepatology
  • Ultrasound Technology

Background:

  • Two-dimensional shear-wave elastography (2D-SWE) is an emerging ultrasound technique for noninvasive liver stiffness assessment.
  • Limited data exists on 2D-SWE performance compared to established point shear-wave elastography (pSWE) using acoustic radiation force impulse imaging.

Purpose of the Study:

  • To compare the diagnostic performance and efficiency of 2D-SWE against pSWE for assessing liver stiffness.
  • To evaluate the impact of region of interest (ROI) size on 2D-SWE measurements.

Main Methods:

  • 2D-SWE and pSWE were performed on 20 cirrhotic patients, 20 healthy individuals, and an elasticity phantom.
  • Stiffness values, examination duration, and measurement counts were compared between the two elastography methods.
  • The influence of varying ROI sizes (5, 10, 20 mm) was assessed for 2D-SWE.

Main Results:

  • 2D-SWE yielded slightly higher stiffness values in healthy individuals compared to pSWE (1.4 vs. 1.23 m/s).
  • No significant differences in stiffness values were observed between 2D-SWE and pSWE in cirrhotic patients (3.06 vs. 3 m/s).
  • Examination times were significantly longer for 2D-SWE in both groups (129.6/157.1 s for healthy/cirrhotic vs. 75/71.6 s for pSWE).
  • 2D-SWE results were comparable across different ROI sizes.
  • Approximately 90% of cirrhotic patients and 100% of healthy individuals achieved results with <5% deviation after 8 and 6 measurements, respectively.

Conclusions:

  • 2D-SWE is comparable to pSWE for assessing liver stiffness in cirrhotic patients, with slightly higher values in healthy individuals.
  • 2D-SWE requires significantly more time than pSWE.
  • ROI size has minor importance in 2D-SWE, but multiple measurements are crucial for reliable results.
  • Further validation with histology as a reference standard in larger cohorts is recommended.