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Multi-detector computed tomography to analyze in-stent restenoses at different heart rates
R Köster1, U van Stevendaal, M Grass
1Klinik und Poliklinik für Kardiologie und Angiologie, Universitäres Herzzentrum Hamburg. rkoester@uke.uni-hamburg.de
Insights
Multi-detector computed tomography (MDCT) can visualize coronary in-stent restenosis. Standard MDCT protocols effectively assess stenosis severity up to 120 bpm with appropriate RR-interval analysis.
Area of Science:
- Cardiovascular imaging
- Medical imaging technology
- Radiology
Background:
- Coronary in-stent restenosis is a significant clinical challenge.
- Accurate visualization of in-stent restenosis is crucial for patient management.
Purpose of the Study:
- To evaluate the effectiveness of multi-detector computed tomography (MDCT) for visualizing coronary in-stent restenosis.
- To compare standard and ultra-high resolution MDCT protocols in assessing in-stent restenosis.
Main Methods:
- A phantom model with varying degrees of stented stenosis was used.
- MDCT scans were performed using standard and ultra-high resolution protocols.
- Simulated heart rates ranged from 40 to 120 bpm.
Main Results:
- Ultra-high resolution scans produced artifacts, limiting assessment of low-grade stenoses.
- Standard protocols showed decreased image quality with increased heart rate.
- Stenosis assessment up to 120 bpm was feasible with standard protocols at optimal RR-intervals.
Conclusions:
- MDCT, particularly with standard protocols, can assess coronary in-stent restenosis severity.
- Optimal RR-interval analysis is key for accurate MDCT assessment at higher heart rates.
- MDCT provides valuable insights into coronary in-stent restenosis visualization.
Purpose:
This study was performed to evaluate the visualization of coronary in-stent restenosis by multi-detector computed tomography (MDCT).
Materials And Methods:
A restenosis phantom with different stented stenoses was used. The phantom was placed into a dynamic heart phantom with heart rates from 40 to 120 bpm. MDCT was performed with two scan protocols: a standard and an ultra-high resolution scan protocol.
Results:
Using the ultra-high resolution protocol, artifacts occurred at 0.6 mm around the stent struts (p < 0.001). Artifacts compromised the discrimination between no stenosis and low-grade stenosis. Approximately 73% of the central lumen diameter was able to be assessed without limiting artifacts allowing the discrimination of no or low vs. moderate and high-grade stenoses (p < 0.05). Using the standard protocol in the dynamic phantom, the image quality and visibility of stenoses decreased with an increasing heart rate (p < 0.0002 and p < 0.004). This was able to be compensated by analysis in an appropriate RR-interval. At the optimal RR-interval, an assessment of the grade of stenoses > 30% was feasible up to 120 bpm.
Conclusion:
Multi-detector computed tomography ultra-high resolution scans allowed the assessment of a wide range of degrees of in-stent restenoses. In this experimental setup, standard protocols allowed a discrimination of low, moderate and high-grade stenoses even at heart rates above 100 bpm.
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