Radiology · 1995
Improved ejection fraction and flow velocity estimates with use of view sharing and uniform repetition time excitation with fast cardiac techniques.
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Foo T K, Bernstein M A, Aisen A M, Hernandez R J, Collick B D, Bernstein T
Аннотация
PURPOSE: To improve the accuracy of ventricular volume estimates and effective temporal resolution in fast cardiac acquisitions.
MATERIALS AND METHODS: Data sets at intermediate temporal phases were generated by means of sharing of views from two temporally adjacent data sets. A simulated model was used, and studies with patients and volunteers were conducted. View sharing was implemented in both fast gradient-echo and fast phase-contrast cine acquisitions; breath holding was used when possible.
RESULTS: Uniform repetition time (TR) radio-frequency (RF) excitation allowed a better assessment of the end-diastolic ventricular volume. In addition, view sharing provided a better estimate of end-systolic ventricular volume in cases in which rapid changes in volume occurred at or about the temporal boundary of the source images. View sharing also provided a much smoother representation of dynamic cardiac motion when viewed in a cine loop.
CONCLUSION: View sharing and uniform TR RF excitation improve the accuracy of end-systolic and end-diastolic ventricular volume measurements by improving the effective temporal resolution.
MATERIALS AND METHODS: Data sets at intermediate temporal phases were generated by means of sharing of views from two temporally adjacent data sets. A simulated model was used, and studies with patients and volunteers were conducted. View sharing was implemented in both fast gradient-echo and fast phase-contrast cine acquisitions; breath holding was used when possible.
RESULTS: Uniform repetition time (TR) radio-frequency (RF) excitation allowed a better assessment of the end-diastolic ventricular volume. In addition, view sharing provided a better estimate of end-systolic ventricular volume in cases in which rapid changes in volume occurred at or about the temporal boundary of the source images. View sharing also provided a much smoother representation of dynamic cardiac motion when viewed in a cine loop.
CONCLUSION: View sharing and uniform TR RF excitation improve the accuracy of end-systolic and end-diastolic ventricular volume measurements by improving the effective temporal resolution.
Предметные рубрики MeSH
AdultBlood Flow VelocityChildCoronary CirculationFourier AnalysisHeartHeart Defects, CongenitalHumansImage Processing, Computer-AssistedInfantMagnetic Resonance ImagingMaleModels, CardiovascularModels, StructuralMyocardial ContractionMyocardiumSignal Processing, Computer-AssistedStroke VolumeTime FactorsTricuspid Valve Insufficiency