| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the image quality of a cross-sectional image irrespective of cylindrical cross-sectional shape of a main coil and a shield coil by suppressing the production of an error magnetic field and further an eddy current.SOLUTION: A gradient magnetic field coil includes: a first cylindrical coil (the main coil) for generating linear magnetic field distribution in an image capturing region of a nuclear magnetic resonance imaging apparatus; and a second cylindrical coil (a shield coil) which is arranged outside the first coil and inside a static magnetic field coil device generating a static magnetic field with uniform magnetic field distribution in the image capturing region, and which suppresses a leakage magnetic field that is from the first coil to the static magnetic field coil device. The cross-section, of the second coil, perpendicular to an axis of the tube shape of the second coil is substantially circular, and a cross-section, of the first coil, perpendicular to an axis of the tube shape of the first coil is not circular. The first coils and/or the second coils are disposed in multiplication and the number of turns is different between the first coils and/or the second coils in two gradient magnetic field coils inclined in the direction different from the axial direction.</p> |
