High speed bolus tagging: time resolved velocity quantification of pulsatile flow in a single breath hold.
We have implemented a high speed method for cardiac-triggered blood velocity quantification within a single breath hold on a conventional MR system. The method, based on bolus tagging, was tested using a pulsatile flow phantom and evaluated in vivo. The image acquisition time was reduced by a factor of N by acquiring N phase encode lines per bolus tag application. The clarity of the flow tag was found to vary with how k-space was covered during data collection. The technique was optimized and multiple bolus tag images were obtained throughout the cardiac cycle within a single breathold.
Chien
D
D
Department of Radiology, University of California-San Francisco.
Saloner
D
D
Laub
G
G
Simonetti
O
O
Anderson
C M
CM
D001013:Aorta, Thoracic / Q000502:physiology*; D016477:Artifacts; D001783:Blood Flow Velocity / Q000502:physiology*; D003198:Computer Simulation; D003287:Contrast Media / Q000008:administration & dosage*; D005583:Fourier Analysis; D006321:Heart / Q000502:physiology*; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008955:Models, Cardiovascular; D008961:Models, Structural; D011673:Pulsatile Flow / Q000502:physiology*; D012039:Regional Blood Flow / Q000502:physiology; D012119:Respiration; D016276:Ventricular Function
D003287:Contrast Media