Measurement of left ventricular velocities: phase contrast MRI velocity mapping versus tissue-doppler-ultrasound in healthy volunteers.
The aim of this study was the comparison of phase contrast magnetic resonance imaging (PCMRI) measurements of left ventricular velocities in a physiological in vivo setting with tissue-Doppler-ultrasound (tissue Doppler imaging: TDI) data in healthy volunteers. Images were acquired in short axis view using a flow compensated black blood k-space segmented gradient echo sequence. Velocity encoding was performed by adding a bipolar gradient after each rf-pulse to the otherwise identical pulse sequences. Full in-plane velocity information of the moving heart was obtained in 16 heartbeats within one breath-hold measurement. Twenty-nine healthy volunteers (mean age=25 years) were examined with both imaging modalities. Both PCMRI and TDI demonstrate a biphasic profile of radial velocities over the cardiac cycle. Intraindividual comparison of left ventricular velocity data acquired using PCMRI and TDI show a very good correspondence with r-values of 0.97. The in vivo study in 29 healthy volunteers demonstrates a high validity of time-resolved phase contrast measurements for the analysis of left ventricular myocardial velocities.
Jung
Bernd
B
Department of Radiology, Section of Medical Physics, University of Freiburg, Freiburg, Germany. bernd.jung@uniklinik-freiburg.de
Schneider
Britta
B
Markl
Michael
M
Saurbier
Bernward
B
Geibel
Annette
A
Hennig
Juergen
J
D000328:Adult; D001783:Blood Flow Velocity; D003287:Contrast Media / Q000008:administration & dosage; D006352:Heart Ventricles / Q000000981:diagnostic imaging; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D015588:Observer Variation; D010210:Papillary Muscles / Q000000981:diagnostic imaging / Q000502:physiology; D012016:Reference Values; D018608:Ultrasonography, Doppler; D014664:Vasodilation / Q000502:physiology; D016276:Ventricular Function; D016277:Ventricular Function, Left / Q000502:physiology
D003287:Contrast Media