【摘要】 本研究提出了恒定梯度场下磁共振快速成像的方法。这种成像方法对磁体场强的要求不高 ( 15 0 0高斯 ) ,在相对较低的场强下具有成像速度快、对梯度场功放要求低、全开放设计等特点。本研究从磁体设计、射频脉冲波形、扩散效应几个方面进行了讨论 ,并提出了几种快速成像脉冲序列。最后给出了用计算机模拟的初步成像结果。更多还原

【Abstract】 In this study, a new magnetic resonance (MR) fast imaging method in the invariant gradient field is presented. In the low main magnetic field (1500 Gauss),this method exhibits the advantages of high imaging speed, low requirement to the gradient amplifier and entirely open design. This article discussed the magnetic body design, radio frequency (RF) waveform, diffusion effect and a few pulse sequences of this imaging method,and the results of computer simulation are given as well.更多还原