发明公开
EP0809810A1 METHOD OF MINIMIZING DEAD-PERIODS IN ORDER TO OBTAIN HARDWARE OPTIMIZED GRADIENT WAVEFORMS
失效
MINIMALISIERUNGSVERFAHREN对于硬件的生产进行优化DEAD期间GRADIENTWELLENFORMEN
- 专利标题: METHOD OF MINIMIZING DEAD-PERIODS IN ORDER TO OBTAIN HARDWARE OPTIMIZED GRADIENT WAVEFORMS
- 专利标题(中): MINIMALISIERUNGSVERFAHREN对于硬件的生产进行优化DEAD期间GRADIENTWELLENFORMEN
-
申请号: EP95931684.0申请日: 1995-09-01
-
公开(公告)号: EP0809810A1公开(公告)日: 1997-12-03
- 发明人: ATALAR, Ergin , McVEIGH, Elliot, Ross
- 申请人: THE JOHNS HOPKINS UNIVERSITY SCHOOL OF MEDICINE
- 申请人地址: No. 2-100, 2024 E. Monument Street Baltimore, MD 21205 US
- 专利权人: THE JOHNS HOPKINS UNIVERSITY SCHOOL OF MEDICINE
- 当前专利权人: THE JOHNS HOPKINS UNIVERSITY SCHOOL OF MEDICINE
- 当前专利权人地址: No. 2-100, 2024 E. Monument Street Baltimore, MD 21205 US
- 代理机构: Howden, Christopher Andrew, et al
- 优先权: US19940346130 19941125
- 国际公布: WO1996017261 19960606
- 主分类号: G01V3
- IPC分类号: G01V3 ; A61B5 ; G01R33
摘要:
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.
信息查询