公开(公告)号：US08648598B2

公开(公告)日：2014-02-11

申请号：US13156408

申请日：2011-06-09

申请人： Mark A. Griswold ,  Jeremiah Heilman

发明人： Mark A. Griswold ,  Jeremiah Heilman

IPC分类号： G01V3/00

CPC分类号： G01R33/5612 ,  G01R33/288

摘要： Systems, methods, and other embodiments associated with controlling the specific absorption rate (SAR) in a patient associated with a conductor are described. The conductor may be, for example, a wire associated with a pacemaker, a wire associated with a neurostimulator, an orthopaedic device, and so on. One example method includes calibrating a multi-channel transmitter associated with a magnetic resonance imaging (MRI) apparatus imaging the patient. The example method also includes controlling the MRI apparatus to transmit radio frequency (RF) energy to image the patient in a manner where the RF energy will only influence the SAR near the conductor in the patient less than a desired threshold amount.

摘要翻译： 描述了与控制与导体相关联的患者中的比吸收率（SAR）相关联的系统，方法和其它实施例。 导体可以是例如与起搏器相关联的线，与神经刺激器相关联的线，整形外科装置等等。 一个示例性方法包括校准与成像患者的磁共振成像（MRI）装置相关联的多通道发射器。 该示例性方法还包括控制MRI设备以射频能量仅影响患者体内导体附近的SAR小于期望阈值的方式来传送射频（RF）能量来对患者进行成像。

公开(公告)号：US08228061B2

公开(公告)日：2012-07-24

申请号：US12407872

申请日：2009-03-20

申请人： Mark A. Griswold ,  Jeremiah Heilman

发明人： Mark A. Griswold ,  Jeremiah Heilman

IPC分类号： G01V3/00

CPC分类号： G01R33/5614 ,  G01R33/5612

摘要： Systems, methods, and other embodiments associated with mitigating off-resonance angle in steady-state coherent magnetic resonance imaging (MRI) are described. One example method includes accessing a B0 map and a coil sensitivity profile associated with an MRI apparatus configured to produce a steady-state coherent MRI sequence to image an object. The MRI apparatus is configured with a multi-channel transmission array having individually controllable transmission channels. The method includes computing transmission control parameters for individual transmission channels as a function of the B0 map and the coil sensitivity profile. The transmission control parameters are configured to facilitate controlling the transmission array to create a spatially varying phase profile using a single dimensional radio frequency (RF) pulse.

摘要翻译： 描述了与稳定相干磁共振成像（MRI）中的减少共振角度相关的系统，方法和其它实施例。 一个示例性方法包括访问B0图和与被配置为产生稳态相干MRI序列以对物体成像的MRI装置相关联的线圈灵敏度轮廓。 MRI装置配置有具有单独可控传输通道的多通道传输阵列。 该方法包括计算作为B0映射和线圈灵敏度分布的函数的各个传输信道的传输控制参数。 传输控制参数被配置为便于控制传输阵列以使用单维射频（RF）脉冲来创建空间变化的相位轮廓。

公开(公告)号：US08224609B2

公开(公告)日：2012-07-17

申请号：US12407889

申请日：2009-03-20

申请人： Mark A. Griswold ,  Jeremiah Heilman

发明人： Mark A. Griswold ,  Jeremiah Heilman

IPC分类号： G01R35/00

CPC分类号： G01R33/5612 ,  G01R33/5607

摘要： Systems, methods, and other embodiments associated with MRI excitation are described. One example method includes performing a calibration to determine a set of transmission parameters for a set of excitation pulses for transmission channels available on a multi-channel MRI transmitter. The set of excitation pulses are configured to produce a resulting nuclear magnetic resonance (NMR) signal from an object exposed to the set of excitation pulses. The resulting NMR signal comprises NMR signal associated with a first NMR resonance associated with the object and NMR signal associated with a second NMR resonance associated with the object.

摘要翻译： 描述与MRI激励相关联的系统，方法和其它实施例。 一个示例性方法包括执行校准以确定用于多通道MRI发射器上可用的传输信道的一组激励脉冲的传输参数集合。 该组激励脉冲被配置为从暴露于该组激励脉冲的物体产生产生的核磁共振（NMR）信号。 所得的NMR信号包括与与物体相关联的第一NMR共振和与与物体相关联的第二NMR共振相关联的NMR信号相关联的NMR信号。

公开(公告)号：US08049499B2

公开(公告)日：2011-11-01

申请号：US12407847

申请日：2009-03-20

申请人： Mark A. Griswold ,  Jeremiah Heilman

发明人： Mark A. Griswold ,  Jeremiah Heilman

IPC分类号： G01V3/00

CPC分类号： G01R33/5612 ,  G01R33/288

摘要： Systems, methods, and other embodiments associated with controlling the specific absorption rate (SAR) in a patient associated with a conductor are described. The conductor may be, for example, a wire associated with a pacemaker, a wire associated with a neurostimulator, an orthopaedic device, and so on. One example method includes calibrating a multi-channel transmitter associated with a magnetic resonance imaging (MRI) apparatus imaging the patient. The example method also includes controlling the MRI apparatus to transmit radio frequency (RF) energy to image the patient in a manner where the RF energy will only influence the SAR near the conductor in the patient less than a desired threshold amount.

摘要翻译： 描述了与控制与导体相关联的患者中的比吸收率（SAR）相关联的系统，方法和其它实施例。 导体可以是例如与起搏器相关联的线，与神经刺激器相关联的线，整形外科装置等等。 一个示例性方法包括校准与成像患者的磁共振成像（MRI）装置相关联的多通道发射器。 该示例性方法还包括控制MRI设备以射频能量仅影响患者体内导体附近的SAR小于期望阈值的方式来传送射频（RF）能量来对患者进行成像。

公开(公告)号：US20100241389A1

公开(公告)日：2010-09-23

申请号：US12407889

申请日：2009-03-20

申请人： Mark A. Griswold ,  Jeremiah Heilman

发明人： Mark A. Griswold ,  Jeremiah Heilman

IPC分类号： G01R35/00 ,  G01R33/20

CPC分类号： G01R33/5612 ,  G01R33/5607

摘要： Systems, methods, and other embodiments associated with MRI excitation are described. One example method includes performing a calibration to determine a set of transmission parameters for a set of excitation pulses for transmission channels available on a multi-channel MRI transmitter. The set of excitation pulses are configured to produce a resulting nuclear magnetic resonance (NMR) signal from an object exposed to the set of excitation pulses. The resulting NMR signal comprises NMR signal associated with a first NMR resonance associated with the object and NMR signal associated with a second NMR resonance associated with the object.

摘要翻译： 描述与MRI激励相关联的系统，方法和其它实施例。 一个示例性方法包括执行校准以确定用于多通道MRI发射器上可用的传输信道的一组激励脉冲的传输参数集合。 该组激励脉冲被配置为从暴露于该组激励脉冲的物体产生产生的核磁共振（NMR）信号。 所得的NMR信号包括与与物体相关联的第一NMR共振和与与物体相关联的第二NMR共振相关联的NMR信号相关联的NMR信号。