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相位编码线
Reconstructing the data obtained by sampling in the phase encoding lines in the area of interest.
重建在所述感兴趣区中的相位编码线采样得到的数据。
The existing several parallel imaging technologies realize the acceleration by regularly reducing the phase encoding lines and restoring the missed data by post-processing, to improve the time resolution or spatial resolution, which is unable to obtain better time resolution and spatial resolution at the same time.
For instance, the phase encoding lines can be further reduced by reducing the size of segments with lower acceleration factors and/or increasing the acceleration factors in the outer segments when the temperature changes faster; so as to achieve higher time resolution.
If the same ideal acceleration rate is applied in several sequential frames, the corresponding phase encoding lines in these frames are interleaved sampled.
如果在多个连续帧中应用相同的理想加速速率,对所述多个连续帧中的相位编码线进行交错采样。
Wherein, the step of adjusting the variable-density data sampling in K-space according to the determined ideal acceleration rate comprises: if the same ideal acceleration rate is applied in several sequential frames, the corresponding phase encoding lines in these frames are interleaved sampled.
If the same VD sampling mode in the K-space is applied in several sequential frames, the corresponding phase encoding lines in these frames are interleaved sampled.
如果相同的K空间VD采样模式应用在几个连续的帧中,这些帧中的相位编码线可以被交错采样。
Applying Inverse Discrete Fourier Transform in the frequency encoding direction of K-space, and selecting the phase encoding lines which contain the area of interest for reconstruction before reconstructing the data obtained by sampling; and
As shown in Figure 6, the lateral axis is the phase encoding direction, the longitudinal axis is time axis, and the signals sampled from the phase encoding lines in the sequent frames on the time axis are interleaved arranged.
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