Jones R A, Haraldseth O, Müller T B, Rinck P A, Oksendal A N
MR Centre, SINTEF/UNIMED, Trondheim, Norway.
Magn Reson Med. 1993 Jun;29(6):830-4. doi: 10.1002/mrm.1910290618.
A rapid dynamic imaging sequence has been developed in which only the 32 phase encoding steps that encode low spatial frequencies are collected for each dynamic image. These are substituted into a previously acquired, 128 x 128 raw data set prior to image reconstruction. In this way the dynamic information is retained while the overall appearance is improved in comparison with images obtained by zero filling to 128 x 128, leading to better qualitative evaluation. The limited k-space sampling means that the technique is most effective for large homogeneous areas of signal change since fine changes in contrast are imperfectly recorded.
已经开发出一种快速动态成像序列，其中每个动态图像仅采集编码低空间频率的32个相位编码步。在图像重建之前，将这些数据代入先前采集的128×128原始数据集。通过这种方式，与通过零填充至128×128获得的图像相比，动态信息得以保留，同时整体外观得到改善，从而实现更好的定性评估。有限的k空间采样意味着该技术对于信号变化的大均匀区域最有效，因为对比度的细微变化记录不完全。
