Real time blood flow imaging by spiral scan phase velocity mapping
| Autor: | S. Collins, Peter D. Gatehouse, D B Longmore, David N. Firmin |
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| Rok vydání: | 1994 |
| Předmět: |
Copper Sulfate
Time Factors Computer science Image quality Valsalva Maneuver Physical Exertion Pulmonary Artery Signal Sampling (signal processing) Humans Plant Oils Radiology Nuclear Medicine and imaging Computer Simulation Cardiac Output Simulation Spiral Aorta Models Cardiovascular Stroke Volume Blood flow Image Enhancement Magnetic Resonance Imaging Models Structural Flow velocity Flow (mathematics) Regional Blood Flow Blood Circulation Phase velocity Artifacts Rheology Algorithms Blood Flow Velocity Copper Biomedical engineering |
| Zdroj: | Magnetic resonance in medicine. 31(5) |
| ISSN: | 0740-3194 |
| Popis: | The work describes the development of a novel sequence that uses rapid spiral k-space sampling, combined with phase velocity mapping, for real time flow velocity imaging. The performance of the technique is assessed on phantoms for both through-plane and in-plane flows. The flow measurements compared well with those measured using a bucket and stopwatch. One advantage of the technique is that flow related signal loss is minimal due to the early acquisition of the center of k-space data. Flow artifacts were observed for in-plane flow and these were understood with the aid of computer simulations. In vivo studies involved cine velocity mapping in normal volunteers; aortic blood flow waveforms acquired by spiral scanning in two cardiac cycles compared well with data from a conventional gradient-echo sequence. Potential applications of the method are demonstrated by studying the response of aortic flow to physical exercise and the real time monitoring of aortic flow during a valsalver maneuver. |
| Databáze: | OpenAIRE |
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