A magnetic field for magnetic resonance imaging apparatus generating means comprises cylindrical yokes, a pair of trapezoidal cross-section of the permanent magnet and a plurality of triangular cross section permanent magnets. 梯形截面永磁体相对平行配置在座架中,其磁极面之间形成预定的间隙. Trapezoidal ...
MRIMagneticFieldsCont’d •Afterafewsecondsinamagneticfield,thespinaxesofasmallfractionoftherelevantnucleialignwitheachother –=Axesallwobbleinsameway–Strengthofthemagneticfielddetermineshowbigthefractionis–Spinaxesarealigned,butnotprecessinginphaseatthispoint–Alignmentofspinaxisofnucleicausesthewholemagnetic...
ahave a surprise 有惊奇[translate] aThe high magnetic fields used for MRI, in addition to the radiofrequency signals, normally prevent use of conductors inside the field space 用于MRI的高磁场,除射频信号之外,通常防止对指挥的用途在领域空间里面[translate]...
Which way does the main magnetic field point in an MR scanner? The answer depends on the type of magnet and its configuration. The vast majority of MR scanners sold today are of cylindrical (tube) design and have their main magnetic fields directed along the bore of the scanner. All ...
An MRI device is provided with a static magnetic field generating device (2) having static magnetic field generating sources (2a, 2b) for generating a homogeneous magnetic field (7) in a space, a gradient magnetic field generating device... 川村 武,今村 幸信,阿部 充志 被引量: 0发表: 201...
MRI signals are spatially encoded in at least one dimension by means of a local gradient system. The local gradients provide Monotonic Spatially Encoded Magnetic field (MSEM) regions. MR signals are acquired, from which the spatial distribution is calculated. For each phase encoding step an excitat...
The Hahn spin preparation sequence provides a practical means for rapid and sensitive mapping of magnetic field inhomogeneity in NMR imaging applications. Choice of the rf pulse delay times τ 1 and τ 2 as well as conditions and limitations on the proposed use of this sequence for chemical shif...
PROBLEM TO BE SOLVED: To provide a magnetic field generator for an MRI in which the thermal connection of the flange part and cylinder part of the radiation heat shield of a recess is excellent and slits are easily formed, and its manufacturing method. SOLUTION: The flange part 9 and cylind...
magnetization measured in field cooled conditions MR magnetoresistive effect MRI magnetic resonance imaging Ms saturation magnetization Msat saturation magnetization MZFC magnetization measured in zero-field cooled conditions NIR near-infrared QY quantum yield RE rare-earth SFMO Sr2FeMoO6 SMSS space modulate...
解析 A。选项 A“Magnetic Resonance Imaging”意思是磁共振成像;选项 B“Medical Radiation Imaging”意思是医疗辐射成像;选项 C“Modern Resonance Inspection”意思是现代共振检查;选项 D“Medical Resonance Inspection”意思是医疗共振检查。在医学领域,MRI 通常指磁共振成像,所以选 A。