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Bicolor K-edge spectral photon-counting CT imaging for the diagnosis of thoracic endoleaks: A dynamic phantom study. | LitMetric

Bicolor K-edge spectral photon-counting CT imaging for the diagnosis of thoracic endoleaks: A dynamic phantom study.

Diagn Interv Imaging

University Lyon, INSA-Lyon, Université Claude Bernard Lyon 1, UJM-Saint Etienne, CNRS, INSERM, CREATIS UMR 5220, U1206, F-69621, 69100 Villeurbanne, France; Department of Radiology, Hôpital Louis Pradel, Hospices Civils de Lyon, 69500 Bron, France. Electronic address:

Published: May 2023

AI Article Synopsis

  • - The study aimed to determine if bicolor K-edge imaging using a spectral photon-counting CT (SPCCT) system could effectively identify and characterize the three main types of endoleaks in a thoracic aorta aneurysm model with a specific contrast agent injection technique.
  • - Researchers created endoleaks in a thoracic aorta phantom and employed a dual-injection method of iodinated and gadolinium-based contrast agents, then scanned the phantom to capture imaging data.
  • - Results showed that conventional imaging could not distinguish the contrast agents effectively, while spectral imaging successfully identified their distribution, enabling specific characterization of type 1, 2, and 3 endoleaks in a single scan.

Article Abstract

Purpose: The purpose of this study was to investigate the feasibility of identifying and characterizing the three most common types of endoleaks within a thoracic aorta aneurysm model using bicolor K-edge imaging with a spectral photon-counting computing tomography (SPCCT) system in combination with a biphasic contrast agent injection.

Materials And Methods: Three types of thoracic endoleaks (type 1, 2 and 3) were created in a dynamic anthropomorphic thoracic aorta phantom. Protocol consisted in an injection of an iodinated contrast material followed 80 seconds after an injection of a gadolinium-based contrast agent (GBCA). The phantom was scanned using a clinical prototype SPCCT during bicolor phase imaging consisting in an early distribution of GBCA and a late distribution of iodine. Conventional and spectral images were reconstructed for differentiating between the contrast agents and measuring their respective attenuation values and concentrations inside and outside the stent graft.

Results: Conventional images failed to provide specific dynamic imaging contrast agents in the aneurysmal sac and outside the stent graft while spectral images differentiated their specific distribution. In type 1 and 3 thoracic endoleaks, GBCA concentration was measured outside the stent graft at 6.1 ± 3.7 (standard deviation [SD]) mg/mL and 6.0 ± 4.0 (SD) mg/mL, respectively, in favor of an early blood flow. In type 2 thoracic endoleak, iodine was measured outside the stent graft at 24.3 ± 5.5 (SD) mg/mL in favor of a late blood flow in the aneurysmal sac.

Conclusion: Bicolor K-edge imaging enabled SPCCT allows a bicolor characterization of thoracic aorta endoleaks in a single acquisition in combination with a biphasic contrast agent injection.

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Source
http://dx.doi.org/10.1016/j.diii.2022.12.003DOI Listing

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