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The influence of motion-compensated reconstruction on coronary artery analysis for a dual-layer detector CT system: a
Magdalena M Dobrolinska1,2, Philip M Tetteroo3, Marcel J W Greuter1
1Department of Radiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
Insights
Motion compensation reconstruction (MCR) significantly reduces cardiac motion artifacts in coronary computed tomography angiography (CCTA). This technique improves coronary artery assessment, particularly for patients with elevated heart rates.
Area of Science:
- Medical Imaging
- Cardiovascular Imaging
- Computed Tomography
Background:
- Cardiac motion artifacts impede accurate coronary artery evaluation in coronary CT angiography (CCTA).
- Elevated heart rates in patients can exacerbate these motion artifacts, potentially leading to non-diagnostic scans.
Purpose of the Study:
- To evaluate the effectiveness of motion compensation reconstruction (MCR) in reducing cardiac motion artifacts in CCTA.
- To assess the impact of MCR across a range of simulated heart rates using a dynamic phantom.
Main Methods:
- A dynamic phantom with an artificial coronary artery was scanned using dual-layer spectral detector CT.
- The artery was subjected to simulated motion velocities (0-80 mm/s) with and without MCR.
- Motion artifacts were quantified by measuring the in-plane motion area and analyzed using regression analysis.
Main Results:
- Without MCR, motion artifact areas significantly increased with velocities over 20 mm/s.
- MCR demonstrated a substantial reduction in motion artifacts, with an 11-fold decrease in artifact area compared to standard reconstruction.
- MCR maintained artifact levels close to reference values across most tested velocities.
Conclusions:
- Motion compensation reconstruction (MCR) effectively reduces coronary artery motion artifacts in CCTA.
- MCR holds potential for improving CCTA diagnostic quality, especially in patients with high or variable heart rates.
- This technology may decrease the incidence of non-diagnostic CCTA scans.
Objectives:
Cardiac motion artifacts hinder the assessment of coronary arteries in coronary computed tomography angiography (CCTA). We investigated the impact of motion compensation reconstruction (MCR) on motion artifacts in CCTA at various heart rates (HR) using a dynamic phantom.
Materials And Methods:
An artificial hollow coronary artery (5-mm diameter lumen) filled with iodinated contrast agent (400 HU at 120 kVp), positioned centrally in an anthropomorphic chest phantom, was scanned using a dual-layer spectral detector CT. The artery was translated at constant horizontal velocities (0-80 mm/s, increment of 10 mm/s). For each velocity, five CCTA scans were repeated using a clinical protocol. Motion artifacts were quantified using the in-plane motion area. Regression analysis was performed to calculate the reduction in motion artifacts provided by MCR, by division of the slopes of non-MCR and MCR fitted lines.
Results:
Reference mean (95% confidence interval) motion artifact area was 24.9 mm2 (23.8, 26.0). Without MCR, motion artifact areas for velocities exceeding 20 mm/s were significantly larger (up to 57.2 mm2 (40.1, 74.2)) than the reference. With MCR, no significant differences compared to the reference were shown for all velocities, except for 70 mm/s (29.0 mm2 (27.0, 31.0)). The slopes of the fitted data were 0.44 and 0.04 for standard and MCR reconstructions, respectively, resulting in an 11-time motion artifact reduction.
Conclusion:
MCR may improve CCTA assessment in patients by reducing coronary artery motion artifacts, especially in those with elevated HR who cannot receive beta blockers or do not attain the targeted HR.
Clinical Relevance Statement:
This vendor-specific motion compensation reconstruction may improve coronary computed tomography angiography assessment in patients by reduction of coronary artery motion artifacts, especially in those with elevated various heart rates (HR) who cannot receive beta blockers or do not attain the targeted HR.
Key Points:
• Motion artifacts are known to hinder the assessment of coronary arteries on coronary CT angiography (CCTA), leading to more non-diagnostic scans. • This dynamic phantom study shows that motion compensation reconstruction (MCR) reduces motion artifacts at various velocities, which may help to decrease the number of non-diagnostic scans. • MCR in this study showed to reduce motion artifacts 11-fold.
