Fast Spiral two-point Dixon technique using block regional off-resonance correction.
Fast Spiral two-point Dixon technique using block regional off-resonance correction.
复制标题
使用块区域偏共振校正的快速螺旋两点 Dixon 技术。
DOI：
10.1002/mrm.20269
复制
发表时间：
2004
影响因子：
3.3
通讯作者：
Duerk,JeffreyL
中科院分区：
文献类型：
--
作者：
Moriguchi,Hisamoto;Lewin,JonathanS;Duerk,JeffreyL
螺旋两点Dixon（螺旋2PD）技术最近被提出作为螺旋成像中明确的水-脂肪分解方法。它还校正了离共振模糊工件仅使用两个数据集。在螺旋2PD技术中，测试了几个预定的非共振频率，以分离水和脂肪信号并去除分解图像的模糊。不幸的是，该算法的计算量非常大，因为测试频率的范围必须设置得足够大，以跨越扫描对象上预期的b0变化的整个范围。块区域离共振校正（BRORC）算法通过重构图像逐块校正离共振模糊伪影，通常比传统的频率分段离共振校正算法提供几倍的计算效率。这项工作表明，水脂肪分解和模糊伪影校正可以使用两个具有不同te的螺旋图像逐块执行，并且这种新技术（broc‐Spiral2PD技术）显着提高了其他螺旋2PD算法的计算效率，为螺旋成像开辟了新的机会。中华医学杂志，2004,32(2):542 - 551。©2004 Wiley‐Liss, Inc。
The Spiral two‐point Dixon (Spiral 2PD) technique has recently been proposed as a method for unambiguous water–fat decomposition in spiral imaging. It also corrects for off‐resonance blurring artifacts using only two data sets. In the Spiral 2PD technique, several predetermined off‐resonance frequencies are tested to both separate water and fat signals and deblur the decomposed images. Unfortunately, the algorithm is computationally quite intensive since the range of tested frequencies must be set sufficiently large to span the full range of anticipatedB0variation over the scanned objects. The block regional off‐resonance correction (BRORC) algorithm corrects for off‐resonance blurring artifacts block by block through the reconstructed image and usually provides several times higher computational efficiency than the conventional frequency‐segmented off‐resonance correction algorithm. This work shows that both water–fat decomposition and blurring artifact correction can be performed block by block using two spiral images with different TEs and that this new technique (BRORC‐Spiral2PD technique) significantly improves the computational efficiency of other Spiral 2PD algorithms, opening new opportunities for spiral imaging. Magn Reson Med 52:1342–1350, 2004. © 2004 Wiley‐Liss, Inc.