Signal behavior in continuously ramped 2D TrueFISP for whole‐body imaging
Signal behavior in continuously ramped 2D TrueFISP for whole‐body imaging
复制标题
用于全身成像的连续斜坡 2D TrueFISP 中的信号行为
DOI：
10.1002/mrm.10323
复制
发表时间：
2002
影响因子：
3.3
通讯作者：
K. Scheffler
中科院分区：
文献类型：
--
作者：
H. Fautz;J. Leupold;J. Hennig;K. Scheffler
基于单层TrueFISP采集开发了一种快速、稳健的成像技术，该技术使用随每次重复递增或空间“斜坡”的层激励频率。单个切片的短采集时间允许在自由呼吸期间进行无伪影成像，这证明了该技术在全身筛查中的潜在用途。连续采集切片的重叠定位用于在自由呼吸测量中提供无间隙体积覆盖。通过仿真和实验，详细分析了渐变TrueFISP的图像对比度。高斜坡速度导致整体信号强度增加，并导致已知T2/T1对比度向质子密度加权对比度的修改。通过基于相邻视图之间的加权过渡的z交错相位编码轨迹实现成像速度的进一步提高。Magn Reson Med 48：1085-1090，2002年。© 2002 Wiley利斯公司
A fast and robust imaging technique was developed based on a single‐slice TrueFISP acquisition using a slice excitation frequency that is incremented, or spatially “ramped,” with each repetition. The short acquisition time of single slices allows artifact‐free imaging during free breathing, which demonstrates the potential use of this technique for whole‐body screening. Overlapping positioning of consecutively acquired slices was used to provide gapless volume coverage in free‐breathing measurements. The image contrast of ramped TrueFISP was analyzed in detail using simulations and experiments. A high ramp speed results in an increased overall signal intensity and in a modification of the known T2/T1 contrast towards a proton density‐weighted contrast. A further increase in imaging speed is achieved with z‐interleaved phase‐encoding trajectories based on weighted transitions between adjacent views. Magn Reson Med 48:1085–1090, 2002. © 2002 Wiley‐Liss, Inc.