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Ultrafast flow quantification with segmented k-space magnetic resonance phase velocity mapping
Haosen Zhang1, Sandr S Halliburton, James R Moore
1Laboratory of Biofluid Mechanics and Cardiovascular Imaging, Department of Chemical Engineering, Cleveland State University, OH 44115-2425, USA.
Annals of Biomedical Engineering
|March 5, 2002
Summary
Ultrafast segmented magnetic resonance (MR) phase-velocity mapping (PVM) accurately quantifies blood flow. This faster technique shows great clinical potential for blood velocity and flow measurements.
Area of Science:
- Medical Imaging
- Cardiovascular Physiology
Background:
- Magnetic resonance (MR) phase-velocity mapping (PVM) is a clinical tool for measuring blood flow velocity.
- Conventional nonsegmented PVM is accurate but time-consuming, requiring 3-5 minutes per measurement.
Purpose of the Study:
- To evaluate the accuracy of ultrafast k-space segmented PVM for quantifying blood flow.
- To compare segmented PVM with conventional nonsegmented PVM and true flow values.
Main Methods:
- Experiments utilized four straight tubes with varying diameters under steady and pulsatile flow conditions.
- Two segmented PVM sequences (5 and 9 lines per segment) were tested.
- Flow measurements were compared against nonsegmented PVM and true flow values.
Main Results:
- Both segmented PVM sequences achieved highly accurate flow quantification with errors less than 5%.
- Accurate results were obtained under steady, pulsatile, and even turbulent flow conditions.
- Statistical analysis showed no significant difference between segmented PVM, nonsegmented PVM, and true flow values (p>>0.05).
Conclusions:
- Ultrafast segmented PVM provides accurate blood flow quantification.
- Segmented PVM offers a significantly faster alternative to conventional methods.
- Ultrafast PVM demonstrates substantial potential for clinical applications in measuring blood velocity and flow.