| 摘要 |
PURPOSE:To prevent operation from becoming unstable even when an RF pulse is mixed-in by interposing a low-pass filter for high frequency wherein cut-off frequency is high and an attenuation characteristic is steep and a low-pass filter for low frequency wherein cut-off frequency is low and an attenuation characteristic is gentle between a power supply part and an inclined magnetic field coil part in series. CONSTITUTION:A low-pass filter LPF 1 for high frequency wherein cut-off frequency fc is high (fc=f1:f1<f0, f0 is resonance frequency) and an attenuation characteristic is steep and a low-pass filter LPF 2 for low frequency wherein the cut-off frequency fc is low (fc=f2:f2<f1<f0) and the attenuation characteristic is gentle are interposed between an amplifier AMP forming a power supply part and an inclined magnetic field coil 2 in series. Even when the RF pulse mixed through the inclined magnetic field coil is one from low frequency to high frequency, filter effect can be effectively developed with respect to the mixed RF pulse. Therefore, the mixed RF pulse can be effectively removed and, therefore, the stable operation of a power supply system can be obtained and, in its turn, a good slice characteristic is obtained. |
