发明名称 |
Device and method for magnetic resonance imaging |
摘要 |
An off-resonance magnetization transfer contrast (MTC) RF-pulse (54, 64) is used in magnetic resonance angiography (MRA) to suppress the signal of various stationary tissues, such as brain tissue while avoiding significant suppression of signal from blood flowing in a general direction of blood flow into a slice being imaged. Application of a magnetic gradient (55, 65, 85) during the MTC RF-pulse (54, 64) directed in the general direction of blood flow increases the magnetization frequency offset (86) relative to the center frequency of the MTC RF-pulse for points within and feeding blood to the slice. The MTC RF-pulse thus causes only a small signal reduction of the blood flowing into the slice in the general direction of blood flow while producing a saturation of any blood flowing into the slice in the opposite direction. Consequently, both time and RF-power needed for a separate presaturation pulse can now be used for the MTC RF-pulse.
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申请公布号 |
US5792054(A) |
申请公布日期 |
1998.08.11 |
申请号 |
US19960712953 |
申请日期 |
1996.09.12 |
申请人 |
U.S. PHILIPS CORPORATION |
发明人 |
KOUWENHOVEN, MARC;VAN VAALS, JOHANNES J.;HOFLAND, LENNART;DE BOER, RUDOLF W. |
分类号 |
A61B5/055;G01R33/48;G01R33/563;(IPC1-7):A61B5/055 |
主分类号 |
A61B5/055 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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