Measurement of Volumetric Mitral and Aortic Blood Flow Based on a New Freehand Three-dimensional Colour Flow Imaging Method. An in vivo Validation
| Autor: | Bjørn Olav Haugen, Sevald Berg, Stig A. Slørdahl, K.M. Brecke, Hans Torp, Terje Skjærpe, Stein Samstad |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Adult
Male Cardiac output medicine.medical_specialty Echocardiography Three-Dimensional symbols.namesake Medical imaging Humans Medicine Radiology Nuclear Medicine and imaging Cardiac Output Observer Variation business.industry Ultrasound Heart General Medicine Blood flow Middle Aged Surgery Volumetric flow rate Transducer Temporal resolution symbols Female Cardiology and Cardiovascular Medicine business Doppler effect Blood Flow Velocity Biomedical engineering |
| Zdroj: | European Journal of Echocardiography. 1:204-212 |
| ISSN: | 1525-2167 |
| DOI: | 10.1053/euje.2000.0044 |
| Popis: | Aims: To validate a new three-dimensional (3D) colour flow method used to calculate cardiac output (CO) in aortic and mitral blood flow. Methods: The transducer was freely tilted transthoracically using a magnetic locating device recording its spatial position. Raw digital ultrasound data were recorded in healthy subjects during 10–20 heartbeats at a high frame rate ranging from 41 to 66 frames/s and analysed off-line with no loss in temporal resolution. Blood flow velocities aligned with the ultrasound beam were integrated across a moving spherical surface to calculate volumetric flow. Results: The range of agreement between the 3D mitral and 3D aortic method was 0·04±1·32 l/min (mean±2 standard deviations). The range of agreement between 3D aortic flow and the two-dimensional (2D) pulsed wave Doppler method (2D PW) in the left ventricular outflow tract (LVOT) was 0·7±1·7 l/min, while the range of agreement between 3D mitral flow and the 2D PW method was 0·88±1·64 l/min. Conclusion: The 3D methods agreed well. The 3D volumetric flow overestimated the 2D PW method, as expected, and the range of agreement was wide. The common pitfalls in pulsed wave ultrasound methods to calculate CO were avoided, as the 3D method was angle-independent, no assumptions about the velocity profile were made, and a moving sample surface was applied. The acquisition of data was fast and easy and high temporal resolution was achieved. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|