MR angiography with two-dimensional acquisition and three-dimensional display. Work in progress |
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Authors: | Keller, PJ Drayer, BP Fram, EK Williams, KD Dumoulin, CL Souza, SP |
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Affiliation: | Barrow Neurological Institute, St Joseph's Hospital and Medical Center, Phoenix, AZ 85013-4496. |
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Abstract: | Magnetic resonance arteriograms of healthy volunteers and selected patients were produced with a new spoiled gradient-echo pulse sequence based on time-of-flight phenomena. The procedure involves sequential acquisition of many contiguous, thin (1.5-mm) axial two-dimensional sections. These volume data are then submitted to a raytracing projection program, which retrospectively yields multiple arbitrary projection angles rotating through any plane. Venous structures are suppressed with a presaturation slab superior to the current section. The slab location is advanced in concert with advancement of each new section location. The acquisition time varies from 6 to 13 minutes, depending on the number of sections acquired for three-dimensional display. This method obviates the subtraction of image data sets to suppress signals from stationary spins, is more sensitive to slow blood flow than three-dimensional methods of acquisition, and shows special promise for the study of extracranial vascular disease. |
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