Publication

Knowledge-Based Iterative Reconstructions for Imaging of Coronary Artery Stents: First In-Vitro Experience and Comparison of Different Radiation Dose Levels and Kernel Settings

Cardiac

Acta Radiol. 2019 Feb;60(2):160-167. doi: 10.1177/0284185118778875

Authors:

T. Hickethier, B. Baeßler, J. R. Kroeger, J. Doerner, D. Müller, D. Maintz, G. Michels, A. C. Bunck

Summary

The study evaluates the impact of iterative model reconstruction (IMR) algorithms on coronary stent imaging using a coronary phantom model with 10 stents. Scans were performed at four radiation dose levels (120 kV/125 mAs, 120 kV/75 mAs, 100 kV/125 mAs, 100 kV/75 mAs) and reconstructed with filtered back projection (FBP), hybrid iterative reconstruction (HIR), and IMR using CardiacRoutine (CR) and CardiacSharp (CS) kernels at three iteration levels.

Key findings include:

  • Noise Reduction: IMR significantly reduced image noise compared to FBP and HIR across all dose levels (p < 0.001). Notably, even at lower doses, noise remained stable with IMR CR3 and CS3, unlike FBP/HIR, where noise increased.
  • Lumen Visibility: IMR CS improved visible lumen diameter compared to FBP, HIR, and IMR CR (p < 0.05), enhancing stent lumen assessment. However, IMR CS caused artificial attenuation decreases, whereas IMR CR maintained more accurate in-stent attenuation values.
  • Dose Independence: Radiation dose variations had minimal impact on lumen visibility or attenuation differences when using IMR, suggesting its robustness for dose reduction without compromising diagnostic quality.
  • Kernel Comparison: FBP and HIR exhibited moderate in-stent attenuation increases, while IMR CR balanced noise reduction with reliable attenuation measurements.

The study concludes that IMR, particularly with CR settings, enables reliable stent imaging at reduced radiation doses by optimizing noise and lumen visualization. These findings support IMR's potential to enhance non-invasive coronary stent surveillance in clinical practice.

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