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1. 发明申请

WO2009150576A1 CRYOCOOLING SYSTEM FOR MRI PROVIDING REDUCED ARTIFACTS CAUSED BY VIBRATIONS 审中-公开
标题翻译：用于MRI提供由振动引起的减少的人造物的CRYOCOOLING SYSTEM
公开(公告)号：WO2009150576A1
公开(公告)日：2009-12-17
申请号：PCT/IB2009/052349
申请日：2009-06-03
申请人： KONINKLIJKE PHILIPS ELECTRONICS N.V. , HARVEY, Paul, R. , REIS, Chandra, T., R. , MACHIELSEN, Adrianus, M. , OVERWEG, Johannes, A. , PFLEIDERER, Glen, G.
发明人： HARVEY, Paul, R. , REIS, Chandra, T., R. , MACHIELSEN, Adrianus, M. , OVERWEG, Johannes, A. , PFLEIDERER, Glen, G.
IPC分类号： G01R33/3815 , G01R33/565
CPC分类号： G01R33/3815 , G01R33/3804 , G01R33/56509
摘要： The invention relates to a magnetic resonance imaging cooling system (148) fo cooling a superconducting magnet (122) of a magnetic resonance imaging system the cooling system (148) comprising a cold head (154), wherein the cold head (154) is drivable at a variable stepping frequency, the cooling system (148) being adapted for varying the stepping frequency in a frequency range of continuous cold head operation, such as to reduce image artifacts caused by vibrations of the MRI system generated by the operation of the cold head.
摘要翻译：本发明涉及一种用于冷却磁共振成像系统的超导磁体（122）的磁共振成像冷却系统，冷却系统（148）包括冷头（154），其中冷头（154）可驱动在可变步进频率下，冷却系统（148）适于在连续冷头操作的频率范围内改变步进频率，例如减少由冷头操作产生的MRI系统的振动引起的图像伪影。

2. 发明申请

WO2003054570A1 METHOD OF PRODUCING AN MRI IMAGE WITH GRADIENT DELAY COMPENSATION 审中-公开
标题翻译：用梯度补偿产生MRI图像的方法
公开(公告)号：WO2003054570A1
公开(公告)日：2003-07-03
申请号：PCT/IB2002/005601
申请日：2002-12-18
申请人： KONINKLIJKE PHILIPS ELECTRONICS N.V. , MACHIELSEN, Adrianus, M.
发明人： MACHIELSEN, Adrianus, M.
IPC分类号： G01R33/385
CPC分类号： G01R33/385 , G01R33/56518
摘要： Gradient pulses are generated by current conducting gradient coi ls. High-frequency components cause the center of gravity of the current to be shifted by mutual influencing of the coil conductors. The shift depends on the electrical resistance of the conductor material, which in turn depends on the temperature of said conductor material, and on the frequency (, such that the magnetic gradient field B decreases with increasing frequency. This phenomenon manifests itself as a delay ( of the gradient pulse with respect to the gradient demand D. The invention proposes to determine during the pulse a quantity representing the conducting state of the conductors of the gradient system and to use a model of the MRI apparatus to calculate the gradient delay ( from that quantity and to correct the gradient demand for said delay.
摘要翻译：梯度脉冲由电流导通梯度系数产生。高频分量导致电流的重心通过线圈导体的相互影响而移动。该移动取决于导体材料的电阻，其又取决于所述导体材料的温度和频率（使得磁梯度场B随着频率的增加而减小，这种现象本身表现为延迟（相对于梯度要求D的梯度脉冲。本发明提出在脉冲期间确定表示梯度系统的导体的导电状态的量，并且使用MRI装置的模型来计算梯度延迟（从该数量并纠正所述延迟的梯度要求。

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