| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce a magnetic field gradient within a space.SOLUTION: A magnetic shield apparatus comprises: a passive shield including an internal space; a first coil correcting a magnetic field in a space to be corrected as a part of the internal space; a first magnetic sensor provided in the internal space; a second magnetic sensor provided in a position closer to the first coil than to the first magnetic sensor in the internal space; and a control section controlling the first coil so that a gradient of the magnetic field measured by the first magnetic sensor and the second magnetic sensor is smaller than a predetermined threshold.</p> |
