MR angiography without subtraction |
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| Authors: | Y Zur X Zou L J Neuringer |
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| Affiliation: | Francis Bitter National Magnet Laboratory, Massachusetts Institute of Technology, Cambridge 02139. |
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| Abstract: | A new NMR method for producing angiograms with strong suppression of the static spin signal and without the need for subtraction is described and demonstrated. A velocity-selective pulse sequence was implemented whereby the magnetization of all stationary spins is driven to the -z axis and is not detected, while maximizing the signal intensity of the moving spins. A theory of the method is presented and gives good agreement with experimental results obtained on a flow phantom. It is shown theoretically and experimentally that high-quality velocity-independent angiograms of the head and neck can be obtained with strong suppression of static spin signal when TR approximately T1. The method can be extended to produce three-dimensional angiograms. |
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