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Ventricular hemodynamics using cardiac computed tomography and optical flow method
Yang-Hsien Lin1, Yung-Hui Huang2, Kang-Ping Lin3
1Department of Diagnostic Radiology, Peng Hu Hospital, Ministry of Health and Welfare, Taiwan Department of Biomedical Imaging and Radiological Science, China Medical University, Taiwan.
Insights
This study quantifies left ventricular hemodynamics using cardiac CT and optical flow. The method visualizes contrast movement, aiding cardiac function assessment.
Area of Science:
- Cardiovascular Imaging
- Medical Physics
- Biomedical Engineering
Background:
- Ventricular hemodynamics is crucial for evaluating cardiac function in clinical settings.
- Current methods for assessing hemodynamics can be complex and invasive.
Purpose of the Study:
- To determine left ventricular (LV) hemodynamics by analyzing contrast agent movement during the cardiac cycle.
- To utilize electrocardiography (ECG)-gated cardiac computed tomography (CT) and the optical flow method for this analysis.
Main Methods:
- Acquired cardiac CT data (120 kV, 280 mA, 350 ms rotation) covering one cardiac cycle using a 640-slice scanner with ECG gating.
- Applied the optical flow method to calculate ventricular hemodynamics (mm/phase) based on contrast changes across ECG phases.
- Analyzed hemodynamic data in anterior-posterior, lateral, and superior-inferior directions.
Main Results:
- Successfully calculated local hemodynamic information within the left ventricle.
- Presented hemodynamic data with color coating for intuitive visualization.
- Demonstrated that the visualization significantly simplified hemodynamic observation.
Conclusions:
- The optical flow method, combined with ECG-gated cardiac CT, provides a non-invasive approach to assess ventricular hemodynamics.
- Visualizing local hemodynamic information enhances the ease of understanding cardiac function.
- This technique shows promise for improved clinical assessment of cardiac performance.
Abstract:
Ventricular hemodynamics plays an important role in assessing cardiac function in clinical practice. The aim of this study was to determine the ventricular hemodynamics based on contrast movement in the left ventricle (LV) between the phases in a cardiac cycle recorded using an electrocardiography (ECG) with cardiac computed tomography (CT) and optical flow method. Cardiac CT data were acquired at 120 kV and 280 mA with a 350 ms gantry rotation, which covered one cardiac cycle, on the 640-slice CT scanner with ECG for a selected patient without heart disease. Ventricular hemodynamics (mm/phase) were calculated using the optical flow method based on contrast changes with ECG phases in anterior-posterior, lateral and superior-inferior directions. Local hemodynamic information of the LV with color coating was presented. The visualization of the functional information made the hemodynamic observation easy.
