首页>
外国专利>
SQUID Detected NRM and MRI at Ultralow Fields
SQUID Detected NRM and MRI at Ultralow Fields
展开▼
机译:SQUID在超低场检测的NRM和MRI
展开▼
页面导航
摘要
著录项
相似文献
摘要
Nuclear magnetic resonance (NMR) signals are detected in microtesla fields. Prepolarization in millitesla fields is followed by detection with an untuned dc superconducting quantum interference device (SQUID) magnetometer. Because the sensitivity of the SQUID is frequency independent, both signal-to-noise ratio (SNR) and spectral resolution are enhanced by detecting the NMR signal in extremely low magnetic fields, where the NMR lines become very narrow even for grossly inhomogeneous measurement fields. MRI in ultralow magnetic field is based on the NMR at ultralow fields. Gradient magnetic fields are applied, and images are constructed from the detected NMR signals.
展开▼