35 results about "Ultra low field" patented technology

Using resonant interactions to directly and tomographically image neural activity in the human brain using magnetic resonance imaging (MRI) techniques at ultra-low field (ULF), the present inventors have established an approach that is sensitive to magnetic field distributions local to the spin population in cortex at the Larmor frequency of the measurement field. Because the Larmor frequency can be readily manipulated (through varying Bm), one can also envision using ULF-DNI to image the frequency distribution of the local fields in cortex. Such information, taken together with simultaneous acquisition of MEG and ULF-NMR signals, enables non-invasive exploration of the correlation between local fields induced by neural activity in cortex and more ‘distant’ measures of brain activity such as MEG and EEG.

An ultra-low magnetic field NMR system can non-invasively examine containers. Database matching techniques can then identify hazardous materials within the containers. Ultra-low field NMR systems are ideal for this purpose because they do not require large powerful magnets and because they can examine materials enclosed in conductive shells such as lead shells. The NMR examination technique can be combined with ultra-low field NMR imaging, where an NMR image is obtained and analyzed to identify target volumes. Spatial sensitivity encoding can also be used to identify target volumes. After the target volumes are identified the NMR measurement technique can be used to identify their contents.

Method comprising obtaining an NMR measurement from a sample wherein an ultra-low field NMR system probes the sample and produces the NMR measurement and wherein a sampling temperature, prepolarizing field, and measurement field are known; detecting the NMR measurement by means of inductive coils; analyzing the NMR measurement to obtain at least one measurement feature wherein the measurement feature comprises T1, T2, T1ρ, or the frequency dependence thereof; and, searching for the at least one measurement feature within a database comprising NMR reference data for at least one material to determine if the sample comprises a material of interest.

Provided are an ultra-low-field nuclear magnetic resonance device and an ultra-low-field nuclear magnetic resonance measuring method. The method includes applying a first measurement bias magnetic field corresponding to an excitation frequency of a coherent biomagnetic field generated in association with the electrophysiological activity of human body organs, applying a second measurement bias magnetic field having the same direction as the first measurement bias magnetic field and having a different magnitude than the first measurement bias magnetic field, and measuring a magnetic resonance signal generated in the human body by using magnetic field measuring means.

Provided are ultra-low-field nuclear-magnetic-resonance myocardial electrical activity detection method and an ultra-low-field nuclear-magnetic-resonance device. The ultra-low-field nuclear-magnetic-resonance device includes magnetic shielding room; a high-sensitivity magnetic field sensor disposed adjacent to a measurement target disposed inside the magnetic shielding room; and a bias magnetic field generating coil for providing an external measurement bias magnetic field, corresponding to a proton magnetic resonance frequency (nuclear magnetic resonance frequency) corresponding to a frequency of periodic myocardial activity of a lesion desired to be measured, to the measurement target. The high-sensitivity magnetic field sensor measures a magnetic resonance signal generated from the measurement target.

The invention relates to an ultra-low-field magnetic imaging device for small living animals, which belongs to the technical field of magnetic imaging, and solves the problems in the prior art that the ultra-low-field magnetic imaging device has a complex structure and is not suitable for scanning large-sized and small animals in vivo . The ultra-low-field magnetic imaging device of the present invention includes a push unit and a magnetometer unit, and the push unit includes a scanning displacement platform, a push rod and an object stage; the scanning displacement stage, the push rod, and the object stage are connected in sequence; the described The magnetometer unit includes a magnetic shield, a scanning channel, an optical channel, an atomic gas pool, and a laser light source and a detector. The scanning channel runs through the side of the magnetic shield, and the atomic gas pool is arranged on one side of the scanning channel. The detector is placed outside the magnetic shield and at one end of the optical channel. The ultra-low-field magnetic imaging device of the present invention has a simple structure, is convenient to assemble and disassemble, and is suitable for scanning large-sized and small animals in vivo on the premise of ensuring ultra-low-field detection sensitivity.

The invention relates to a superconducting quantum interference device (SQUID) cooling device of handheld ultra low field magnetic resonance imaging (MRI). The SQUID cooling device comprises a cooling head and a cooling conduit, wherein the cooling head is connected with an external cooling device through the cooling conduit. Ultra low temperature suitable for the operation of an SQUID is acquired through a cold supply device and transmitted to the SQUID through the cooling conduit and the cooling head so as to provide an ultra low temperature working environment for the SQUID; because only the cooling head and partial cooling conduit need to be encapsulated, liquid helium and liquid nitrogen are not needed; because only the cooling head and the cooling conduit need to be encapsulated, the cooling device has simple and practical structure, and saves the operation and maintenance costs; and the device is suitable to be used as the cooling device for the SQUID of the handheld ultra low field MRI. A cooling capsule is arranged, and one of the cooling capsule and an external refrigerating device can be selectively used; under the condition that the external refrigerating device is started, the used cooling capsule can be inserted into the installation cavity of the cooling capsule; and through the external refrigerating device, the coolant in the cooling capsule is newly liquefied, so that the cooling capsule can be recycled.