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Method and magnetic resonance apparatus to acquire magnetic resonance data with a diffusion-weighted magnetic resonance sequence

一种磁共振数据、磁共振设备的技术，应用在使用核磁共振图像系统进行测量、磁共振测量、使用磁变量测量等方向，能够解决延长读取过程、回波时间延长、下降转换速率等问题，达到实现回波时间、短回波时间、快回波时间的效果

Active Publication Date: 2015-04-29
SIEMENS HEALTHCARE GMBH
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Problems solved by technology

The main reason for the extended echo time is that the reading process has to be significantly extended due to the significantly reduced slew rate

Method used

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  • Method and magnetic resonance apparatus to acquire magnetic resonance data with a diffusion-weighted magnetic resonance sequence
  • Method and magnetic resonance apparatus to acquire magnetic resonance data with a diffusion-weighted magnetic resonance sequence
  • Method and magnetic resonance apparatus to acquire magnetic resonance data with a diffusion-weighted magnetic resonance sequence

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Embodiment Construction

[0031] figure 1 The principle sequence of a RESOLVE magnetic resonance sequence known from the prior art for recording magnetic resonance data for diffusion-weighted imaging is shown. In this case, the magnetic resonance sequence shown can be divided into two subsequences, namely a first subsequence 1 in which magnetic resonance data are recorded and a second subsequence 2 from which navigation data are to be obtained in order to detect and correct shifts in the acquisition field due to the recording. The resulting phase error, or triggers a readout segment involving re-recording in k-space.

[0032] exist figure 1 The pulses and time windows shown in the diagram from top to bottom are first the high-frequency pulse (RF–Radio Frequency) and then the gradient pulse G acting in the gradient direction x covered by the gradient coil x (here the readout gradient), the gradient pulse G acting in the gradient direction y covered by the other gradient coil y , and the gradient puls...

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Abstract

In a method and magnetic resonance apparatus to acquire magnetic resonance data with a diffusion-weighted magnetic resonance sequence wherein the magnetic resonance apparatus as a gradient coil arrangement with three gradient coils designed to generate a gradient in gradient directions orthogonal to one another, the readout gradient is flipped relative to at least one of the gradient directions such that at least two gradient coils contribute to a possible slew rate of a readout gradient pulse, and such that a phase coding gradient that is constant over the readout time period is selected.

Description

technical field [0001] The invention relates to a method for recording magnetic resonance data using a diffusion-weighted magnetic resonance sequence using a magnetic resonance system having a gradient coil arrangement comprising three gradients configured to generate gradients in mutually perpendicular gradient directions coil. Furthermore, the invention relates to a magnetic resonance system. Background technique [0002] Magnetic resonance imaging is a widely known and versatile imaging method that is often used in the medical field. In this case, within the scope of the magnetic resonance sequence, the spins are excited by at least one excitation pulse, and after a certain time period (the so-called echo time), the magnetic resonance signals generated by the spins are recorded in the readout period. In this case, the position coding is carried out by means of gradients which are switched on at different points in time of the magnetic resonance sequence. Here, the dist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/563G01R33/561A61B5/055
CPCG01R33/561G01R33/56341A61B5/055G01R33/34G01R33/385G01R33/50
Inventor D.格罗茨基
Owner SIEMENS HEALTHCARE GMBH
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