Aletras A H, Ding S, Balaban R S, Wen H
Laboratory of Cardiac Energetics, NHLBI, Bethesda, Maryland, 20892-1061, USA.
J Magn Reson. 1999 Mar;137(1):247-52. doi: 10.1006/jmre.1998.1676.
Displacement encoding with stimulated echoes (DENSE) was developed for high-resolution myocardial displacement mapping. Pixel phase is modulated by myocardial displacement and data spatial resolution is limited only by pixel size. 2D displacement vector maps were generated for the systolic action in canines with 0.94 x 1.9 mm nominal in-plane resolution and 2.3 mm/pi displacement encoding. A radial strain of 0.208 was measured across the free left ventricular wall over 105 ms during systole. DENSE displacement maps require small first-order gradient moments for encoding. DENSE magnitude images exhibit black-blood contrast which allows for better myocardial definition and reduced motion-related artifacts.
刺激回波位移编码（DENSE）技术是为高分辨率心肌位移成像而开发的。像素相位由心肌位移调制，数据空间分辨率仅受像素大小限制。以0.94×1.9毫米的标称平面分辨率和2.3毫米/π的位移编码，为犬类的收缩期运动生成了二维位移矢量图。在收缩期105毫秒内，测量了左心室游离壁的径向应变，为0.208。DENSE位移图编码所需的一阶梯度矩较小。DENSE幅值图像呈现黑血对比，可更好地界定心肌并减少与运动相关的伪影。
