title: Nuclear magnetic resonance velocity spectra of steady flow.
abstract: Nuclear magnetic resonance (NMR) velocity spectra are a compact way to represent the flow information in a velocity-resolved image set. Fully developed steady flow in long tubes gives NMR velocity spectra with average velocities which correlate well with the values derived from the flow rate. The ratio of average velocity to peak velocity correlates well with the Reynolds number. Tubes with compressed cross sections have velocity spectra similar to those of circular tubes. Tubes with irregular walls have velocity spectra in the entrance region that are markedly different from those from smooth-walled tubes.
authors.affiliation: Nuclear Medicine Service, St. Luke's Episcopal Hospital, Houston, Texas 77030.
authors.forename: R E
authors.initials: RE
authors.lastname: Wendt
authors.forename: W R
authors.initials: WR
authors.lastname: Nitz
authors.forename: P H
authors.initials: PH
authors.lastname: Murphy
mesh_terms: D001161:Arteriosclerosis / Q000175:diagnosis; D001783:Blood Flow Velocity; D006801:Humans; D008279:Magnetic Resonance Imaging; D008961:Models, Structural