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1. 发明申请

US20150015258A1 METHOD AND MAGNETIC RESONANCE APPARATUS TO DETERMINE A B1 PHASE MAP 有权
标题翻译：方法和磁共振装置确定B1相位图
公开(公告)号：US20150015258A1
公开(公告)日：2015-01-15
申请号：US14328983
申请日：2014-07-11
申请人： Siemens Aktiengesellschaft
发明人： Hans-Peter Fautz , Patrick Gross , Rene Gumbrecht
IPC分类号： G01R33/44
CPC分类号： G01R33/246 , G01R33/243 , G01R33/56563
摘要： In a method to determine a B1 phase map for at least two excitation modes of a radio-frequency coil arrangement of a magnetic resonance apparatus, the radio-frequency coil arrangement having multiple independently controllable transmission channels, and the B1 phase map describing, with spatial resolution, the phase of radio-frequency field this is generated in a respective excitation mode relative to a common reference phase map, first magnetic resonance data describing the phase change of a basic magnetic field of the magnetic resonance apparatus between a first echo time and a second echo time are acquired, and are evaluated to determine a spatially resolved Larmor frequency value that describes the deviation from a nominal Larmor frequency of the magnetic resonance apparatus. To correct raw phase maps derived from second magnetic resonance data acquired using a respective one of the excitation modes, a correction map, determined relative to the reference phase map, is calculated and subtracted from the raw phase map under consideration of the Larmor frequency value and the echo times in the acquisition of the second magnetic resonance data.
摘要翻译：在确定用于磁共振装置的射频线圈装置的至少两种激励模式的B1相位图的方法中，具有多个独立可控的传输信道的射频线圈装置和具有空间的B1相位图分辨率，相对于公共参考相位图，在相应的激励模式下产生射频场的相位，第一磁共振数据描述磁共振装置的第一回波时间和第一回波时间之间的基本磁场的相位变化获得第二回波时间，并且被评估以确定描述与磁共振装置的标称拉莫尔频率的偏差的空间解析的拉莫尔频率值。为了校正从使用各个激励模式获得的第二磁共振数据得到的原始相图，计算出相对于参考相位图确定的校正图，并在考虑到拉莫尔频率值时从原始相位图中减去，在获取第二磁共振数据时的回波时间。

2. 发明授权

US09970998B2 Method and magnetic resonance apparatus to determine a B1 phase map 有权
公开(公告)号：US09970998B2
公开(公告)日：2018-05-15
申请号：US14328983
申请日：2014-07-11
申请人： Siemens Aktiengesellschaft
发明人： Hans-Peter Fautz , Patrick Gross , Rene Gumbrecht
IPC分类号： G01R33/24 , G01R33/565
CPC分类号： G01R33/246 , G01R33/243 , G01R33/56563
摘要： In a method to determine a B1 phase map for at least two excitation modes of a radio-frequency coil arrangement of a magnetic resonance apparatus, the radio-frequency coil arrangement having multiple independently controllable transmission channels, and the B1 phase map describing, with spatial resolution, the phase of radio-frequency field this is generated in a respective excitation mode relative to a common reference phase map, first magnetic resonance data describing the phase change of a basic magnetic field of the magnetic resonance apparatus between a first echo time and a second echo time are acquired, and are evaluated to determine a spatially resolved Larmor frequency value that describes the deviation from a nominal Larmor frequency of the magnetic resonance apparatus. To correct raw phase maps derived from second magnetic resonance data acquired using a respective one of the excitation modes, a correction map, determined relative to the reference phase map, is calculated and subtracted from the raw phase map under consideration of the Larmor frequency value and the echo times in the acquisition of the second magnetic resonance data.

3. 发明授权

US09830711B2 Method and magnetic resonance apparatus for correction of a B0 map for chemical shifts 有权
公开(公告)号：US09830711B2
公开(公告)日：2017-11-28
申请号：US14603629
申请日：2015-01-23
申请人： Siemens Aktiengesellschaft
发明人： Rene Gumbrecht , Michael Koehler , Rainer Schneider
IPC分类号： G01R33/24 , G06T7/00 , G01R33/48 , G01R33/56 , G01R33/565 , G01R33/561
CPC分类号： G06T7/162 , G01R33/243 , G01R33/4828 , G01R33/5608 , G01R33/5615 , G01R33/56527 , G01R33/56563
摘要： In a method for correction of a B0 field map measured with a magnetic resonance device, that describes deviations from a nominal field strength in the homogeneity area of the magnetic resonance device by deviations from a nominal frequency for protons bonded to water, the deviations being represented as Larmor frequency values for different picture elements shifted by chemical shifts, the B0 field map is recorded with spins of the fat and water protons not in phase. The B0 field map is segmented by evaluating the differences of the Larmor frequency values of adjacent picture elements of the B0 field map in at least two contiguous clusters. For each cluster, a decision is made on the basis of a smoothness criterion and a compactness criterion as to whether a cluster containing a majority of protons bonded into fat is involved. Clusters identified as containing a majority of protons bonded into fat are corrected by lowering the Larmor frequency values by the difference between the nominal frequency for protons bonded into water and the corresponding nominal frequency for protons bonded to fat.

4. 发明授权

US09671475B2 Device, method and system for controlling imaging methods and systems 有权
公开(公告)号：US09671475B2
公开(公告)日：2017-06-06
申请号：US14228457
申请日：2014-03-28
申请人： Siemens Aktiengesellschaft
发明人： Holger Adolf , Thomas Benner , Hans-Peter Fautz , Joerg Ulrich Fontius , Rene Gumbrecht
IPC分类号： G01R33/28 , G01R33/54
CPC分类号： G01R33/288 , G01R33/543
摘要： In a computer-implemented method, device and system for controlling an imaging system, a specific absorption rate is calculated with a computation unit and an RF transmission signal of the imaging system is controlled with a control device. The process of controlling of the RF transmission signal includes disconnecting the RF transmission signal when a remaining period during which the RF transmission signal is harmless for the patient has been reduced to zero.

5. 发明授权

US09880250B2 Method and magnetic resonance apparatus for image reconstruction with multiple virtual coils 有权
公开(公告)号：US09880250B2
公开(公告)日：2018-01-30
申请号：US14504758
申请日：2014-10-02
申请人： SIEMENS AKTIENGESELLSCHAFT
发明人： Patrick Gross , Rene Gumbrecht
IPC分类号： G01V3/00 , G01R33/565 , G01R33/56 , G06T11/00 , G01R33/561
CPC分类号： G01R33/56554 , G01R33/5608 , G01R33/5611 , G06T11/005 , G06T2211/424
摘要： An MR image is produced from data acquired by radiating an RF pulse and switching multiple bipolar magnetic field gradients to generate multiple gradient echoes that are acquired in a raw data set with multiple raw data lines by a reception coil, the multiple gradient echoes being acquired with bipolar magnetic field gradients of different polarity. Due to the bipolar magnetic field gradients of different polarity, in the raw data set first raw data lines are filled with MR signals in one direction in raw data space, and second raw data lines are filled with MR signals in the opposite direction. The MR image is reconstructed from MR signals that have simultaneously been acquired with at least two different reception coils, by generating a first coil raw data set from the raw data set in the image reconstruction, which coil raw data set has only the raw data lines of the raw data set that were filled with MR signals in one direction, and by selecting a second coil raw data set that has only the raw data lines of the raw data set that were filled with MR signals in the other set direction. The MR image is reconstructed from the two coil raw data sets using a parallel imaging reconstruction algorithm, under the assumption that the two coil raw data sets have been acquired by different reception coils.

6. 发明申请

US20150204955A1 METHOD AND MAGNETIC RESONANCE APPARATUS FOR CORRECTION OF A B0 MAP FOR CHEMICAL SHIFTS 有权
标题翻译：用于校正B0 MAP化学发光的方法和磁共振装置
公开(公告)号：US20150204955A1
公开(公告)日：2015-07-23
申请号：US14603629
申请日：2015-01-23
申请人： SIEMENS AKTIENGESELLSCHAFT
发明人： Rene Gumbrecht , Michael Koehler , Rainer Schneider
IPC分类号： G01R33/44 , G06T7/00 , G01R33/565 , G01R33/56 , G01R33/48
CPC分类号： G06T7/162 , G01R33/243 , G01R33/4828 , G01R33/5608 , G01R33/5615 , G01R33/56527 , G01R33/56563
摘要： In a method for correction of a B0 field map measured with a magnetic resonance device, that describes deviations from a nominal field strength in the homogeneity area of the magnetic resonance device by deviations from a nominal frequency for protons bonded to water, the deviations being represented as Larmor frequency values for different picture elements shifted by chemical shifts, the B0 field map is recorded with spins of the fat and water protons not in phase. The B0 field map is segmented by evaluating the differences of the Larmor frequency values of adjacent picture elements of the B0 field map in at least two contiguous clusters. For each cluster, a decision is made on the basis of a smoothness criterion and a compactness criterion as to whether a cluster containing a majority of protons bonded into fat is involved. Clusters identified as containing a majority of protons bonded into fat are corrected by lowering the Larmor frequency values by the difference between the nominal frequency for protons bonded into water and the corresponding nominal frequency for protons bonded to fat.
摘要翻译：在用磁共振装置测量的B0场映射的校正方法中，通过与键合到水的质子的标称频率的偏差来描述磁共振装置的均匀区域中的标称磁场强度的偏差，这些偏差被表示作为通过化学位移移位的不同图像元素的拉莫尔频率值，B0场图以不同相位的脂肪和水质子的自旋记录。通过评估至少两个连续簇中的B0场映射的相邻像素的Larmor频率值的差异来分割B0场映射。对于每个簇，基于平滑度标准和紧密标准来确定是否涉及包含大部分键合在脂肪中的质子的簇。被认为含有大部分键合到脂肪中的质子的簇通过降低Larmor频率值，通过键合到水中的质子的标称频率和与脂肪键合的质子的相应名义频率之间的差来校正。

7. 发明申请

US20150077115A1 METHOD AND COMPUTER TO DETERMINE A B0 FIELD MAP WITH A MAGNETIC RESONANCE APPARATUS 审中-公开
标题翻译：使用磁共振装置确定B0场地图的方法和计算机
公开(公告)号：US20150077115A1
公开(公告)日：2015-03-19
申请号：US14487541
申请日：2014-09-16
申请人： Siemens Aktiengesellschaft
发明人： Hans-Peter Fautz , Patrick Gross , Rene Gumbrecht
IPC分类号： G01R33/44 , G01R33/24 , G01R33/565
CPC分类号： G01R33/443 , G01R33/243 , G01R33/56563
摘要： In a method to determine a B0 field map describing the local deviation of a nominal Larmor frequency of a magnetic resonance apparatus, wherein magnetic resonance data are acquired in measurements implemented at two different echo times whose difference forms a dephasing time after an excitation at at least two different dephasing times, and a phase change to be used to determine the B0 field map is determined from a difference of phases measured at different echo times, the phase changes of different dephasing times are evaluated to at least partially reduce an ambiguity due to a Nyquist phase wrapping, by using dephasing times that result as a quotient or, given the use of only two dephasing times, as a product, of a base time and a respective prime number from a group including at least two different prime numbers that are greater than one, and wherein the group is selected depending on a desired dynamic range of the B0 field map and/or a maximum tolerated measurement error for the measurements.
摘要翻译：在确定描述磁共振装置的标称拉莫尔频率的局部偏差的B0场图的方法中，其中在两个不同的回波时间实现的测量中获取磁共振数据，其差异在至少在激发之后形成去相位时间两个不同的去相位时间，并且用于确定B0场映射的相位变化是根据在不同回波时间测量的相位差来确定的，评估不同去相位时间的相位变化以至少部分地减少由于奈奎斯特阶段包装，通过使用导致作为商的去相位时间，或者给定仅使用两个去相位时间作为基准时间的基准时间和相应质数的乘积，该组包括至少两个较大的不同素数并且其中根据B0场图的期望动态范围和/或最大容许测量误差来选择组测量。

8. 发明申请

US20140292332A1 DEVICE, METHOD AND SYSTEM FOR CONTROLLING IMAGING METHODS AND SYSTEMS 有权
标题翻译：用于控制成像方法和系统的装置，方法和系统
公开(公告)号：US20140292332A1
公开(公告)日：2014-10-02
申请号：US14228457
申请日：2014-03-28
申请人： Siemens Aktiengesellschaft
发明人： Holger Adolf , Thomas Benner , Hans-Peter Fautz , Joerg Ulrich Fontius , Rene Gumbrecht
IPC分类号： G01R33/32
CPC分类号： G01R33/288 , G01R33/543
摘要： In a computer-implemented method, device and system for controlling an imaging system, a specific absorption rate is calculated with a computation unit and an RF transmission signal of the imaging system is controlled with a control device. The process of controlling of the RF transmission signal includes disconnecting the RF transmission signal when a remaining period during which the RF transmission signal is harmless for the patient has been reduced to zero.
摘要翻译：在计算机实现的方法中，用于控制成像系统的装置和系统，用计算单元计算特定吸收率，并且通过控制装置控制成像系统的RF传输信号。控制RF传输信号的过程包括当RF传输信号对患者无害的剩余时间已经减少到零时断开RF传输信号。

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