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发明公开
CN107407714A 用于根据B0图和B1图来计算导出值的MRI方法 有权

用于根据B0图和B1图来计算导出值的MRI方法
摘要：
本发明提供了一种用于采集来自成像区(108)内的对象(118)的磁共振数据(110、1104)的磁共振成像系统(100、300、100)。所述磁共振成像系统包括：存储器(136)，其用于存储机器可执行指令(160、162、164、166、316)和脉冲序列数据(140、1102)。所述脉冲序列数据包括用于根据磁共振成像方法控制所述磁共振成像系统来采集磁共振数据的指令。所述磁共振成像系统还包括：处理器(130)，其用于控制所述磁共振成像系统。所述机器可执行指令的执行使得所述处理器：通过利用所述脉冲序列数据控制所述磁共振成像系统来采集(1200)所述磁共振数据；通过根据所述磁共振成像方法分析所述磁共振数据来计算(1202)B0不均匀性图(148)，通过根据所述磁共振成像方法分析所述磁共振数据来计算(1204)B1相位图(150)和/或B1幅度图(1106)；并且在至少一个预定方向上计算(1206)所述B1相位图的二阶导数(1110)和/或所述B1幅值图1的二阶导数和/或所述B0不均匀性图的二阶导数。所述二阶导数是使用所述至少一个预定方向上的经校正的体素尺寸而计算出的，其中，所述经校正的体素尺寸是使用根据所述B0不均匀性图的导数计算出的校正因子而计算出的。
摘要（英）：

The invention provides for a magnetic resonance imaging system (100, 300, 100) for acquiring magnetic resonance data (110, 1104) from a subject (118) within an imaging zone (108). The magnetic resonance imaging system comprises a memory (136) for storing machine executable instructions (160, 162, 164, 166, 316) and pulse sequence data (140, 1102). The pulse sequence data comprises instructions for controlling the magnetic resonance imaging system to acquire magnetic resonance data according to a magnetic resonance imaging method. The magnetic resonance imaging system further comprises a processor (130) for controlling the magnetic resonance imaging system. Execution of the machine executable instructions causes the processor to: acquire (1200) the magnetic resonance data by controlling the magnetic resonance imaging system with the pulse sequence data; calculate(1202) a B0 inhomogeneity map (148) by analyzing the magnetic resonance data according to the magnetic resonance imaging method, calculate (1204) a B1 phase map (150) and/or a B1 amplitude map (1106) by analyzing the magnetic resonance data according to the magnetic resonance imaging method; and calculate (1206) a second derivative (1110) of the B1 phase map and/or a second derivative of the B1 magnitude map 1 and/or a second derivative of the B0 in homogeneity map in at least one predetermined direction. The second derivative is calculated using a corrected voxel size in the at least one predetermined direction, wherein the corrected voxel size is calculated using a correction factor calculated from the derivative of the B0 inhomogeneity map.

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