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Combined Near-infrared Fluorescent Imaging and Micro-computed Tomography for Directly Visualizing Cerebral Thromboemboli
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Differentiating Hemorrhage and Contrast Extravasation After Mechanical Thrombectomy Using Virtual Non-Contrast

Eya Khadhraoui1, Roland Schwab1,2, Mathias Becker3

  • 1Clinic for Neuroradiology, Otto-Von-Guericke-University Magdeburg, Leipziger Str. 44, 39120, Magdeburg, Germany.

Clinical Neuroradiology
|June 17, 2026
PubMed
Summary

Virtual Non-Contrast (VNC) imaging with photon-counting CT reliably differentiates intracranial hemorrhage from contrast extravasation after mechanical thrombectomy. This technique aids crucial early treatment decisions by accurately distinguishing blood from iodine-based contrast material.

Keywords:
Contrast ExtravasationHemorrhagePhoton-Counting CTThrombectomyVirtual Non-Contrast

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Cardiac Magnetic Resonance for the Evaluation of Suspected Cardiac Thrombus: Conventional and Emerging Techniques

Published on: June 11, 2019

Area of Science:

  • Neuroradiology
  • Medical Imaging Technology
  • Interventional Neurology

Background:

  • Distinguishing intracranial hemorrhage from contrast extravasation post-thrombectomy is a critical diagnostic challenge on CT.
  • Both conditions appear hyperdense, impacting urgent clinical decisions like anticoagulation.
  • Virtual Non-Contrast (VNC) imaging using photon-counting CT (PCCT) offers a potential solution by isolating iodine contrast.

Purpose of the Study:

  • To assess the clinical feasibility of the VNC technique in post-thrombectomy patients.
  • To evaluate the diagnostic performance of VNC in differentiating hemorrhage from contrast extravasation.
  • Focus on early post-procedural imaging interpretation.

Main Methods:

  • Retrospective analysis of 36 patients undergoing PCCT after mechanical thrombectomy.
  • Independent assessment of hyperdense areas by two neuroradiologists using VNC datasets.
  • Comparison of VNC findings, including volumes, with follow-up imaging.

Main Results:

  • VNC imaging successfully differentiated hemorrhage from contrast staining.
  • Sensitivity for hemorrhage detection was 0.93 (25/27 patients), with 100% specificity.
  • Contrast extravasation was accurately identified in 9 cases using VNC and native CT.

Conclusions:

  • The VNC technique using PCCT shows high clinical utility in the early post-thrombectomy period.
  • Reliable differentiation between hemorrhage and contrast extravasation is achieved in most cases.
  • Diagnostic limitations may persist in rare cases of extensive extravasation or overlapping features.