Undersampled projection-reconstruction imaging for time-resolved contrast-enhanced imaging.
In time-resolved contrast-enhanced 3D MR angiography, spatial resolution is traded for high temporal resolution. A hybrid method is presented that attempts to reduce this tradeoff in two of the spatial dimensions. It combines an undersampled projection acquisition in two dimensions with variable rate k-space sampling in the third. Spatial resolution in the projection plane is determined by readout resolution and is limited primarily by signal-to-noise ratio. Oversampling the center of k-space combined with temporal k-space interpolation provides time frames with minimal venous contamination. Results demonstrating improved resolution in phantoms and volunteers are presented using angular undersampling factors up to eight with acceptable projection reconstruction artifacts.
Vigen
K K
KK
Department of Medical Physics, University of Wisconsin, Madison 53792, USA. vigen@mr.radiology.wisc.edu
Peters
D C
DC
Grist
T M
TM
Block
W F
WF
Mistretta
C A
CA
D000005:Abdomen / Q000033:anatomy & histology; D000465:Algorithms; D016477:Artifacts; D003287:Contrast Media; D005240:Feasibility Studies; D006801:Humans; D018810:Magnetic Resonance Angiography / Q000379:methods* / Q000706:statistics & numerical data; D019047:Phantoms, Imaging / Q000706:statistics & numerical data; D013997:Time Factors
D003287:Contrast Media