Flow Measurement and Instrumentation
Magnetic resonance (MR) imaging is a well-known diagnostic imaging modality. In addition to its high-quality imaging capabilities, hydrogen-based MR can also provide non-invasively the velocity of water-based fluids in all three spatial directions (through-plane and in-plane) in an image. Many previous studies showed that MR velocity imaging can accurately measure the through-plane velocity. The aim of this study was to evaluate how reliable are the in-plane velocity measurements in an image. The axial velocity of water in horizontal tubes (inner diameter: 14.7–26.2 mm) was measured with segmented (fast) and non-segmented (slow) k-space MR velocity imaging using: (a) an imaging slice placed perpendicular to the tube axis with through-plane velocity-encoding; and (b) an imaging slice placed parallel to the tube axis with in-plane velocity-encoding. The two planes intersected along the vertical tube-centerline. The flow rate was accurately quantified (mean error plane velocity profiles were not significantly different from the through-plane profiles (mean difference =6%, correlation coefficients >0.98). There was no significant difference between the velocity profiles from the segmented and the non-segmented sequences (mean difference 0.95). The results of this study suggest that fast MR velocity imaging can measure the in-plane velocity in an image with reliability.
Zhang, Haosen; Halliburton, Sandra S.; Venkatachari, Andan K.; Setser, Randolph M.; White, Richard D.; and Chatzimavroudis, George P., "Reliable In-Plane Velocity Measurements With Magnetic Resonance Velocity Imaging" (2006). Chemical & Biomedical Engineering Faculty Publications. 74.
Zhang, H., Halliburton, S. S., Venkatachari, A. K., Setser, R. M., White, R. D., , & Chatzimavroudis, G. P. (2006). Reliable in-plane velocity measurements with magnetic resonance velocity imaging. Flow Measurement and Instrumentation, 17(2), 75-80. doi:10.1016/j.flowmeasinst.2005.11.003
NOTICE: this is the author’s version of a work that was accepted for publication in Flow Measurement and Instrumentation. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Flow Measurement and Instrumentation, 17, 2, (April 2006) DOI 10.1016/j.flowmeasinst.2005.11.003