公开(公告)号：US08473536B2

公开(公告)日：2013-06-25

申请号：US12489285

申请日：2009-06-22

申请人： Priti Balchandani ,  John M. Pauly ,  Daniel M. Spielman

发明人： Priti Balchandani ,  John M. Pauly ,  Daniel M. Spielman

IPC分类号： G06F15/00 ,  G06F7/00

CPC分类号： G01R33/44 ,  G01R33/4833

摘要： A method for providing an adiabatic RF pulse that is an inversion or refocusing pulse for a RF pulse sequence is provided. A linear phase frequency profile (Flp(ω)) is determined for the adiabatic RF pulse. A quadratic phase is applied to the linear phase frequency profile for the adiabatic RF pulse to obtain F(ω), wherein the applying the quadratic phase comprises setting F(ω)=Flp(ω)eikω2. A polynomial β is set to equal a Fourier Transform (F(ω)). A corresponding minimum phase α polynomial is determined for the β polynomial. (α,β) are set as inputs to an inverse Shinnar Le-Roux transform to generate an adiabatic RF waveform. The adiabatic RF waveform is truncated to produce the adiabatic RF pulse, wherein k>0.03π/(ω5−ωp)/(N+1) and k

摘要翻译： 提供了一种用于提供作为RF脉冲序列的反转或重聚焦脉冲的绝热RF脉冲的方法。 确定绝热RF脉冲的线性相位频率分布（Flp（ω））。 将二次相位施加到用于绝热RF脉冲的线性相位频率分布以获得F（ω），其中应用二次相位包括设置F（ω）= Flp（ω）eikomega2。 多项式β被设置为等于傅里叶变换（F（ω））。 对于β多项式确定相应的最小相位α多项式。 （α，β）被设置为反向Shinnar Le-Roux变换的输入以产生绝热RF波形。 绝热RF波形被截断以产生绝热射频脉冲，其中k> 0.03pi /（ω5-omegap）/（N + 1）和k

公开(公告)号：US07821263B2

公开(公告)日：2010-10-26

申请号：US12136319

申请日：2008-06-10

申请人： Priti Balchandani ,  Daniel Spielman ,  John M. Pauly

发明人： Priti Balchandani ,  Daniel Spielman ,  John M. Pauly

IPC分类号： G01V3/00

CPC分类号： G01R33/5601 ,  G01R33/4833 ,  G01R33/4835

摘要： A method for frequency selective and slice selective magnetic resonance imaging (MRI) is provided. A B0 field is applied. A self-refocused spatial-spectral (SPSP) RF pulse is applied. A readout of a portion of k-space for the excited slice is performed. A second self-refocused SPSP excitation RF pulse is applied, wherein the second self-refocused SPSP excitation has an 180° echo phase difference from the self-refocused SPSP excitation. A second readout of a portion of k-space for the excited slice was performed. A difference between the readout and the second readout was found. The previous steps were repeated until k-space has been filled for the excited slice. The previous steps were repeated for a plurality of slices.

摘要翻译： 提供了频率选择和切片选择性磁共振成像（MRI）的方法。 应用B0字段。 应用自重聚焦空间光谱（SPSP）RF脉冲。 执行激励切片的k空间的一部分的读出。 应用第二个自重新聚焦的SPSP激励RF脉冲，其中第二自重聚焦SPSP激发与自重新聚焦的SPSP激发具有180°的回波相位差。 进行激发切片的k空间的一部分的第二次读出。 发现读出和第二读数之间的差异。 重复前面的步骤，直到激活切片填充k空间为止。 对于多个切片重复前面的步骤。

公开(公告)号：US20090137897A1

公开(公告)日：2009-05-28

申请号：US11944739

申请日：2007-11-26

申请人： Priti Balchandani ,  Daniel Spielman ,  John Pauly

发明人： Priti Balchandani ,  Daniel Spielman ,  John Pauly

IPC分类号： A61B5/05 ,  G01V3/00

CPC分类号： G01R33/485 ,  A61B5/05 ,  Y10T436/24

摘要： A method for performing spectroscopy using an interleaved readout for at least two species. A B0 field is applied. A first spatial-spectral (SPSP) position resolved spectroscopy sequence (PRESS) excitation with a sufficiently narrow band to excite a first species without exciting a second species is applied. A first readout that measures the first species is performed. A second SPSP PRESS excitation with a sufficiently narrow band to excite the second species without exciting the first species is applied. A second readout that measures the second species is performed.

摘要翻译： 一种使用至少两种物种的交错读出来进行光谱的方法。 应用B0字段。 应用具有足够窄带的第一空间光谱（SPSP）位置分辨光谱序列（PRESS）激发以激发第一种而不激发第二种。 执行测量第一个物种的第一个读数。 施加具有足够窄带以激发第二种而不激发第一种的第二SPSP PRESS激发。 执行测量第二物种的第二读数。

公开(公告)号：US07683618B2

公开(公告)日：2010-03-23

申请号：US12048107

申请日：2008-03-13

申请人： Priti Balchandani ,  Daniel Spielman ,  John Pauly

发明人： Priti Balchandani ,  Daniel Spielman ,  John Pauly

IPC分类号： G01V3/00

CPC分类号： G01R33/4833

摘要： A manifestation of the invention provides a method for slice selective excitation for magnetic resonance imaging (MRI). A B0 field is applied. A STABLE pulse comprising of a BIR-4 envelope sampled by a plurality of subpulses with a duration is applied, where amplitude and frequency modulation functions of the BIR-4 envelope are slowly varying with respect to the duration of the subpulses. A portion of k-space is read out to obtain k-space data. The STABLE pulse and readout are repeated until sufficient k-space has been acquired. A Fourier Transform of the k-space data is taken.

摘要翻译： 本发明的一个表现提供了一种用于磁共振成像（MRI）的切片选择性激发的方法。 应用B0字段。 施加包括由具有持续时间的多个子脉冲采样的BIR-4包络的稳定脉冲，其中BIR-4包络的幅度和频率调制函数相对于子脉冲的持续时间缓慢变化。 读取k空间的一部分以获得k空间数据。 重复STABLE脉冲和读数，直到获得足够的k空间。 采用k空间数据的傅立叶变换。

公开(公告)号：US20090230958A1

公开(公告)日：2009-09-17

申请号：US12048107

申请日：2008-03-13

申请人： Priti Balchandani ,  Daniel Spielman ,  John Pauly

发明人： Priti Balchandani ,  Daniel Spielman ,  John Pauly

IPC分类号： G01R33/483

CPC分类号： G01R33/4833

摘要： A manifestation of the invention provides a method for slice selective excitation for magnetic resonance imaging (MRI). A B0 field is applied. A STABLE pulse comprising of a BIR-4 envelope sampled by a plurality of subpulses with a duration is applied, where amplitude and frequency modulation functions of the BIR-4 envelope are slowly varying with respect to the duration of the subpulses. A portion of k-space is read out to obtain k-space data. The STABLE pulse and readout are repeated until sufficient k-space has been acquired. A Fourier Transform of the k-space data is taken.

摘要翻译： 本发明的一个表现提供了一种用于磁共振成像（MRI）的切片选择性激发的方法。 应用B0字段。 施加包括由具有持续时间的多个子脉冲采样的BIR-4包络的稳定脉冲，其中BIR-4包络的幅度和频率调制函数相对于子脉冲的持续时间缓慢变化。 读取k空间的一部分以获得k空间数据。 重复STABLE脉冲和读数，直到获得足够的k空间。 采用k空间数据的傅立叶变换。

公开(公告)号：US07966053B2

公开(公告)日：2011-06-21

申请号：US11944739

申请日：2007-11-26

申请人： Priti Balchandani ,  Daniel Spielman ,  John Pauly

发明人： Priti Balchandani ,  Daniel Spielman ,  John Pauly

IPC分类号： A61B5/05 ,  G01N24/00 ,  G01V3/00

CPC分类号： G01R33/485 ,  A61B5/05 ,  Y10T436/24

摘要： A method for performing spectroscopy using an interleaved readout for at least two species. A B0 field is applied. A first spatial-spectral (SPSP) position resolved spectroscopy sequence (PRESS) excitation with a sufficiently narrow band to excite a first species without exciting a second species is applied. A first readout that measures the first species is performed. A second SPSP PRESS excitation with a sufficiently narrow band to excite the second species without exciting the first species is applied. A second readout that measures the second species is performed.

摘要翻译： 一种使用至少两种物种的交错读出来进行光谱的方法。 应用B0字段。 应用具有足够窄带的第一空间光谱（SPSP）位置分辨光谱序列（PRESS）激发以激发第一种而不激发第二种。 执行测量第一个物种的第一个读数。 施加具有足够窄带以激发第二种而不激发第一种的第二SPSP PRESS激发。 执行测量第二物种的第二读数。

公开(公告)号：US20100325185A1

公开(公告)日：2010-12-23

申请号：US12489285

申请日：2009-06-22

申请人： Priti BALCHANDANI ,  John M. PAULY ,  Daniel M. SPIELMAN

发明人： Priti BALCHANDANI ,  John M. PAULY ,  Daniel M. SPIELMAN

IPC分类号： G06F17/14 ,  G01R33/44

CPC分类号： G01R33/44 ,  G01R33/4833

摘要： A method for providing an adiabatic RF pulse that is an inversion or refocusing pulse for a RF pulse sequence is provided. A linear phase frequency profile (Flp(ω)) is determined for the adiabatic RF pulse. A quadratic phase is applied to the linear phase frequency profile for the adiabatic RF pulse to obtain F(ω), wherein the applying the quadratic phase comprises setting F(ω)=Flp(ω)eikω2. A polynomial β us set ti equal a Fourier Transform (F(ω)). A corresponding minimum phase α polynomial is determined for the β polynomial. (α,β) are set as inputs to an inverse Shinnar Le-Roux transform to generate an adiabatic RF waveform. The adiabatic RF waveform is truncated to produce the adiabatic RF pulse, wherein k>0.03π/(ω5−ωp)/(N+1) and k

摘要翻译： 提供了一种用于提供作为RF脉冲序列的反转或重聚焦脉冲的绝热RF脉冲的方法。 确定绝热RF脉冲的线性相位频率分布（Flp（ω））。 将二次相位应用于绝热RF脉冲的线性相位频率分布，以获得F（ω），其中施加二次相位包括设置F（ω）= Flp（ω）eikω2。 多项式＆bgr; 我们设置ti等于傅里叶变换（F（ω））。 确定对应的最小相位α多项式为＆bgr; 多项式。 （α，＆bgr）被设置为反向Shinnar Le-Roux变换的输入以产生绝热RF波形。 绝热RF波形被截断以产生绝热RF脉冲，其中k> 0.03和pgr / /（ω5-ωp）/（N + 1）和k

公开(公告)号：US20090315558A1

公开(公告)日：2009-12-24

申请号：US12136319

申请日：2008-06-10

申请人： Priti Balchandani ,  Daniel Spielman ,  John M. Pauly

发明人： Priti Balchandani ,  Daniel Spielman ,  John M. Pauly

IPC分类号： G01R33/48

CPC分类号： G01R33/5601 ,  G01R33/4833 ,  G01R33/4835

摘要： A method for frequency selective and slice selective magnetic resonance imaging (MRI) is provided. A B0 field is applied. A self-refocused spatial-spectral (SPSP) RF pulse is applied. A readout of a portion of k-space for the excited slice is performed. A second self-refocused SPSP excitation RF pulse is applied, wherein the second self-refocused SPSP excitation has an 180° echo phase difference from the self-refocused SPSP excitation. A second readout of a portion of k-space for the excited slice was performed. A difference between the readout and the second readout was found. The previous steps were repeated until k-space has been filled for the excited slice. The previous steps were repeated for a plurality of slices.

摘要翻译： 提供了频率选择和切片选择性磁共振成像（MRI）的方法。 应用B0字段。 应用自重聚焦空间光谱（SPSP）RF脉冲。 执行激励切片的k空间的一部分的读出。 应用第二个自重新聚焦的SPSP激励RF脉冲，其中第二自重聚焦SPSP激发与自重新聚焦的SPSP激发具有180°的回波相位差。 进行激发切片的k空间的一部分的第二次读出。 发现读出和第二读数之间的差异。 重复前面的步骤，直到激活切片填充k空间为止。 对于多个切片重复前面的步骤。