Conference paper
Intraoperative Vector Flow Imaging of the Heart
Copenhagen University Hospital Herlev and Gentofte1
Department of Electrical Engineering, Technical University of Denmark2
Biomedical Engineering, Department of Electrical Engineering, Technical University of Denmark3
Center for Fast Ultrasound Imaging, Centers, Technical University of Denmark4
The cardiac flow is complex and multidirectional, and difficult to measure with conventional Doppler ultrasound (US) methods due to the one-dimensional and angle-dependent velocity estimation. The vector velocity method Transverse Oscillation (TO) has been proposed as a solution to this. TO is implemented on a conventional US scanner (Pro Focus 2202 UltraView, BK Medical) using a linear transducer (8670, BK Medical) and can provide real-time, angle-independent vector velocity estimates of the cardiac blood flow.
During cardiac surgery, epicardiac US examinations using TO were performed on three patients. Antegrade central jet and retrograde flow near the vessel wall in the ascending aorta and the pulmonary artery were seen during systole, while stable vortices were seen in the aortic sinuses and complex flow patterns were seen around the valves during diastole.
In the right atrium, a stable vortex was seen during the entire heart cycle. For comparison, simultaneous Measurements were obtained with conventional spectral Doppler (SD) and intravenous catheter thermodilution technique (TD). Peak systolic velocities were underestimated by 18% compared to SD and cardiac output was underestimated by 16% compared to TD.
This is the first time TO measurements have been obtained of cardiac flow. TO can potentially reveal new information of cardiovascular physiology and blood flow dynamics, and become a valuable tool in cardiology.
| Language: | English |
|---|---|
| Publisher: | IEEE |
| Year: | 2013 |
| Pages: | 1745-1748 |
| Proceedings: | 2013 IEEE International Ultrasonics Symposium |
| Series: | Ieee International Ultrasonics Symposium, Ius |
| ISBN: | 1467356840 , 1467356859 , 1467356867 , 9781467356848 , 9781467356855 and 9781467356862 |
| ISSN: | 19485719 |
| Types: | Conference paper |
| DOI: | 10.1109/ULTSYM.2013.0445 |
| ORCIDs: | Jensen, Jørgen Arendt , 0000-0003-3928-4875 , 0000-0003-2338-6033 and 0000-0002-9380-1688 |
Blood flow Cardiology Intraoperative ultrasound Transverse Oscillation Vector velocity estimation
Biomedical imaging Doppler effect Estimation Fluid flow measurement Heart TO measurements Valves Vectors angle-dependent velocity estimation antegrade central jet aortic sinuses biomedical transducers biomedical ultrasonics blood flow blood flow dynamics blood flow measurement blood vessels cardiac blood flow cardiac surgery cardiology cardiovascular physiology cardiovascular system catheters complex flow patterns conventional Doppler ultrasound methods conventional US scanner conventional spectral Doppler technique heart cycle intraoperative ultrasound intraoperative vector flow imaging intravenous catheter thermodilution technique linear transducer one-dimensional velocity estimation oscillations pulmonary artery retrograde flow right atrium surgery transverse oscillation ultrasonic therapy ultrasonic transducers vector velocity estimation vector velocity method velocity measurement
