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Inherently Radiopaque Narrow-Size-Calibrated Microspheres: Proof of Principle in a Pig Embolization Model.

Christof M Sommer1,2, A Harms3, T D Do4

  • 1Clinic for Diagnostic and Interventional Radiology, University Hospital Heidelberg, INF 110, 69120, Heidelberg, Germany. christof.sommer@med.uni-heidelberg.de.

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Summary
This summary is machine-generated.

The new Visible microspheres offer in vivo radiopacity for better visualization during pulmonary artery embolization. Unlike other types, Visible microspheres demonstrate clear visibility in cone-beam CT, aiding in predictable arterial distribution.

Keywords:
EmbolizationRadiopaque microspheresX-ray imaging

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Area of Science:

  • Interventional Radiology
  • Medical Imaging
  • Biomaterials Science

Background:

  • Radiopaque microspheres are crucial for visualizing embolization procedures.
  • Current microspheres have limitations in radiopacity and size calibration.
  • Accurate visualization and predictable distribution are key for effective embolization therapy.

Purpose of the Study:

  • To evaluate the radiopacity, size, morphology, and vascular distribution of inherently radiopaque microspheres.
  • To compare a novel radiopaque microsphere (Visible) with established ones (DCBead™, Embozene™).
  • To assess microsphere performance in vitro and in a porcine pulmonary artery embolization model.

Main Methods:

  • Comparison of three microsphere types: Visible (prototype), DCBead™, and Embozene™.
  • Assessment of size and size calibration using laser diffraction.
  • In vitro, in vivo (cone-beam CT), and ex vivo (micro-CT) radiopacity evaluation.
  • Microscopic examination of morphology and vascular distribution in a pig model.

Main Results:

  • Visible microspheres exhibited higher radiopacity than Embozene™ in vitro and ex vivo; DCBead™ showed no radiopacity.
  • In vivo cone-beam CT confirmed radiopacity for Visible, but not for Embozene™ or DCBead™.
  • Visible and Embozene™ showed predictable arterial distribution, while DCBead™ had wider distribution, including smaller vessels.

Conclusions:

  • Visible microspheres provide significant in vivo radiopacity in cone-beam CT, unlike Embozene™ and DCBead™.
  • Narrow-size-calibrated Visible and Embozene™ enable predictable arterial distribution.
  • Visible microspheres offer improved visualization for pulmonary artery embolization, potentially reducing complications.