PROBLEM TO BE SOLVED: To realize medium or low magnetization while sustaining image quality, and improve resistance to a magnetic field.SOLUTION: An MRI system 1 detects nuclear magnetic resonance signals emitted through nuclear magnetic resonances of nuclei in a subject 2, and includes magnetic field generation means 3 that generates at least a static magnetic field in a space including the subject 2, a non-high temperature superconducting SNS type SQUID sensor 6 that detects the nuclear magnetic resonance signals, and a cryogenic refrigerator 7 that cools the non-high temperature superconducting SNS type SQUID sensor. The non-high temperature superconducting SNS type SQUID sensor 6 can sustain image quality even in a medium or low magnetic field because it exhibits a highly sensitive property in the medium or low magnetic field. Further, the non-high temperature superconducting SNS type SQUID sensor 6 has a property of hardly causing a flux trap, and is therefore unsusceptible to an adverse effect of an external magnetic field.COPYRIGHT: (C)2015,JPO&INPIT【課題】画質を維持しつつ中低磁場化を実現し、かつ、磁場耐性を向上させる。【解決手段】MRI装置1は、被検体2における原子核の核磁気共鳴により放出される核磁気共鳴信号を検出するものであって、被検体2を含む空間に静磁場を少なくとも発生させる磁場発生手段3と、核磁気共鳴信号の検出を行うための非高温超電導SNS型SQUIDセンサ6と、非高温超電導SNS型SQUIDセンサを冷却する極低温冷凍機7と、を備える。この非高温超電導SNS型SQUIDセンサ6は、中低磁場で高感度な性質を有するため、中低磁場においても画質を維持できる。さらに、この非高温超電導SNS型SQUIDセンサ6にあっては磁束トラップが発生しにくい性質を有するため、外部の磁場からの影響を受け難くすることができる。【選択図】図1
