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发明授权
CN104363829B 多回波PRESTO 有权

多回波PRESTO
摘要：
一种磁共振成像系统(78)包括磁共振成像设备(80)、一个或多个处理器(104)和显示器(106)。所述磁共振成像设备(80)包括磁体(82)、梯度线圈(88)和一个或多个射频线圈(92)。所述磁体(82)生成B0场。所述梯度线圈(88)对所述B0场施加梯度场。所述一个或多个射频线圈(92)生成射频脉冲以激励磁共振并且测量生成的梯度回波。所述一个或多个处理器(104)被配置为激活(116)所述一个或多个射频线圈(92)以生成分隔开重复时间的一系列射频脉冲并且诱发磁共振。所述一个或多个处理器(104)被配置为：控制(118)所述梯度线圈以在每个RF脉冲之后施加读出梯度场脉冲，所述读出梯度场脉冲将所述共振重新聚焦为多个梯度回波；施加移位梯度场脉冲和重新聚焦梯度场脉冲，所述移位梯度场脉冲和重新聚焦梯度场脉冲将所述回波中的至少一个移位并重新聚焦到接下来的重复时间；并且接收并解调所述梯度回波以形成k空间数据线。所述一个或多个处理器被配置为根据测得的一个或多个梯度回波来重建(124)一个或多个图像。显示器(106)显示所述一个或多个经重建的图像。
摘要（英）：

A magnetic resonance imaging system (78) includes a magnetic resonance imaging device (80), one or more processors (104), and a display (106). The magnetic resonance imaging device (80) includes a magnet (82), gradient coils (88), and one or more radio frequency coils (92). The magnet (82) generates a Bo field. The gradient coils (88) apply gradient fields to the Bo field. The one or more radio frequency coils (92) generate a radio frequency pulse to excite magnetic resonance and measure generated gradient echoes. The one or more processors (104) are configured to activate (116) the one or more radio frequency coils (92) to generate a series of radio frequency pulses spaced by repetition times and to induce magnetic resonance. The one or more processors (104) are configured to control (118) the gradient coils to apply after each RF pulse readout gradient field pulses which refocus the resonance into a plurality of gradient echoes, shift and refocus gradient field pulses which shift and refocus at least one of the echoes to a subsequent repetition time, and receive and demodulate the gradient echoes to form k-space data lines. The one or more processors are configured to reconstruct (124) one or more images from the measured one or more gradient echoes. A display (106) displays the one or more reconstructed images.

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