Axel L, Dougherty L
Department of Radiology, Hospital of the University of Pennsylvania, Philadelphia.
Radiology. 1989 Aug;172(2):349-50. doi: 10.1148/radiology.172.2.2748813.
A previously reported method of using magnetic resonance (MR) imaging to study heart wall motion involves a pair of nonselective radio-frequency (RF) pulses, separated by a magnetic field gradient pulse, prior to imaging; this produces images with a regular pattern of stripes that move with the heart wall and that have a sinusoidal intensity profile. It is demonstrated in this study that the substitution of more RF pulses, with their relative amplitudes distributed according to the binomial sequence, results in sharper stripes. This permits the use of a two-dimensional grid of stripes for more detailed studies of heart wall motion and provides a unique method of analyzing regional ventricular myocardial strain.
一种先前报道的利用磁共振（MR）成像研究心脏壁运动的方法，在成像之前涉及一对非选择性射频（RF）脉冲，由一个磁场梯度脉冲隔开；这会产生具有规则条纹图案的图像，这些条纹随心脏壁移动且具有正弦强度分布。本研究表明，用更多的射频脉冲替代，其相对幅度按二项式序列分布，会产生更清晰的条纹。这允许使用条纹的二维网格对心脏壁运动进行更详细的研究，并提供了一种分析局部心室心肌应变的独特方法。
