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Undersampled projection-reconstruction imaging for time-resolved contrast-enhanced imaging

✍ Scribed by Karl K. Vigen; Dana C. Peters; Thomas M. Grist; Walter F. Block; Charles A. Mistretta

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
300 KB
Volume
43
Category
Article
ISSN
0740-3194

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✦ Synopsis

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.

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