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Elastography for the pancreas: Current status and future perspective.

Natsuko Kawada1, Sachiko Tanaka1

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Summary

Pancreatic elastography uses ultrasound or endoscopic ultrasound (EUS) to measure tissue stiffness. Shear wave elastography offers better imaging of the entire pancreas compared to strain elastography.

Keywords:
ElastographyPancreasShear waveStrain

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Area of Science:

  • Medical imaging
  • Gastroenterology
  • Diagnostic techniques

Background:

  • Elastography is a non-invasive imaging technique used to assess tissue stiffness.
  • Pancreatic elastography, utilizing ultrasound or endoscopic ultrasound (EUS), aids in evaluating pancreatic tissue characteristics.
  • Two primary methods, strain elastography and shear wave elastography, are employed, each with distinct principles and applications.

Purpose of the Study:

  • To compare the technical feasibility and imaging capabilities of strain elastography and shear wave elastography for pancreatic assessment.
  • To highlight the advantages of shear wave elastography in visualizing the entire pancreas.
  • To introduce recent clinical guidelines for pancreatic elastography.

Main Methods:

  • Strain elastography estimates tissue stiffness by measuring deformation under external pressure.
  • Shear wave elastography measures the propagation speed of shear waves generated by acoustic radiation impulse (ARFI) to determine stiffness.
  • Comparison of image acquisition in the pancreatic head, body, and tail for both methods.

Main Results:

  • Strain elastography is limited in obtaining uniform elastograms, particularly in the pancreatic head and tail, due to probe positioning constraints.
  • Shear wave elastography allows for consistent imaging across the entire pancreas by directing ARFI emissions as needed.
  • Shear wave elastography is currently not feasible with EUS.

Conclusions:

  • Shear wave elastography provides superior and more comprehensive pancreatic imaging compared to strain elastography.
  • Recent Japanese Society of Medical Ultrasonics guidelines offer technical insights for performing pancreatic elastography.
  • Further development is needed to integrate shear wave elastography with EUS for enhanced pancreatic diagnostics.