会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 72. 发明申请
    • METHOD OF MINIMIZING DEAD-PERIODS IN ORDER TO OBTAIN HARDWARE OPTIMIZED GRADIENT WAVEFORMS
    • 最终将死亡期限最小化的方法用于获取硬件优化梯度波形
    • WO1996017261A1
    • 1996-06-06
    • PCT/US1995011167
    • 1995-09-01
    • THE JOHNS HOPKINS UNIVERSITY SCHOOL OF MEDICINE
    • THE JOHNS HOPKINS UNIVERSITY SCHOOL OF MEDICINEATALAR, ErginMcVEIGH, Elliot, Ross
    • G01V03/00
    • G01R33/4833G01R33/561
    • A method of minimizing dead-periods in magnetic resonance imaging pulse sequences employs a specimen disposed within magnetic field (6), a source of RF signals (2), a receiver (8) for receiving signals from the specimen responsive to RF pulses and emitting respective output signals. A computer (12) is provided for receiving the output signals from the receiver and establishing image information which may be displayed (16). For the dead-period, the minimum and maximum phase encoding step, the scan plane gradient pulse for the slice, phase encoding and readout directions are determined and the moments contained within the dead-period waveform is determined. The values are transformed into gradient amplifier coordinates and the minimum dead-period based on the dead-period waveform is determined. The dead-period is employed in establishing a hardware optimized waveform which may be trapezoidal. The trapezoidal waveform is preferably established by for each phase encoding step determining the starting and ending gradient levels and the moments contained within the dead-period waveform using the calculated minimum dead-period.
    • 一种使磁共振成像脉冲序列中的死区最小化的方法使用设置在磁场(6)内的样本,RF信号源(2),用于从RF脉冲接收来自样本的信号的接收器(8) 各自的输出信号。 提供一种计算机(12),用于接收来自接收机的输出信号并建立可显示的图像信息(16)。 在死区期间,确定最小和最大相位编码步骤,用于切片,相位编码和读出方向的扫描平面梯度脉冲,并且确定包含在死区波形内的力矩。 将值转换为梯度放大器坐标,并确定基于死区波形的最小死区。 死区是用来建立可能是梯形的硬件优化波形。 优选地,对于每个相位编码步骤,使用所计算的最小死区确定起始和结束梯度水平以及包含在死区波形内的力矩来建立梯形波形。