Gradient magnetic field coil device, adjustment method therefor, and magnetic resonance imaging apparatus

A gradient magnetic field coil device comprising:

• a plurality of first coils each of which generates in an imaging region of a magnetic field resonance imaging device a magnetic field distribution in which an intensity linearly inclines;
• and
• a plurality of second coils each of which is arranged on an opposite side of the imaging region across the first coils and suppresses residual magnetic field generated on the opposite side by the first coil, wherein
• the plurality of first coils and the plurality of second coils are connected in series, the gradient magnetic field coil device further comprising
• a plurality of current adjusting devices, connected to either of the first coils or the second coils in parallel, independently adjusting currents flowing through the first coils or the second coils, respectively.

A gradient magnetic field coil device comprising:

• a plurality of first coils each of which generates in an imaging region of a magnetic field resonance imaging device a magnetic field distribution in which an intensity linearly inclines;
• and
• a plurality of second coils each of which is arranged on an opposite side of the imaging region across the first coils and suppresses residual magnetic field generated on the opposite side by the first coil, the gradient magnetic field coil device comprising:
• a first parallel circuit including the plurality of the first coils connected in parallel;
• and
• a second parallel circuit including the plurality of the second coils connected in parallel, the first parallel circuit and the second parallel circuit being connected in series, wherein
• a plurality of current adjusting devices are connected to the plurality of first coils or the plurality of second coils in series, independently adjusting currents flowing through the plurality of first coils or the second coils connected in series, respectively.

A method of adjusting a gradient magnetic field including:

• a plurality of first coils each of which generates in an imaging region of a magnetic field resonance imaging device a magnetic field distribution in which an intensity linearly inclines;
• and
• a plurality of second coils each of which is arranged on an opposite side of the imaging region across the first coils and suppresses residual magnetic field generated on the opposite side by the first coils, the method comprising:
• connecting the plurality of first coils and the plurality of second coils in series,
• connecting a plurality of current adjusting devices, connected to the second coils, and independently adjusting currents flowing through the second coils, respectively.