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]...
一种可以减小因流经梯度磁场线圈的脉冲电流效应而产生的极靴之间的剩磁及涡流,但不减小气隙中的磁场均匀性的MRI磁场发生器. A residual magnetism and eddy current can be reduced due to the pulse current flowing through the effect of the gradient magnetic field generated by the coil between the pole ...
解析 A。MRI 是 Magnetic Resonance Imaging 的缩写,意为“磁共振成像”。选项 B“Medical Resonance Inspection”意为“医学共振检查”,不是常见缩写;选项 C“Modern Resonance Imaging”意为“现代共振成像”,不是 MRI 的缩写;选项 D“Medical Radiology Inspection”意为“医学放射学检查”,与 MRI 无关。
An improved magnetic field generating device for use with a medical nuclear magnetic resonance tomographic device (MRI). The device comprises a magnetic circuit formed of a pair of magnetic pole pieces connected by yoke members in opposi... Ohta,Kimiharu,and,... - 《Magnetic Resonance Imaging》...
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...
PROBLEM TO BE SOLVED: To provide an apparatus for displaying a range of a leakage magnetic field of an MRI apparatus which allows an easy confirmation of a region outside of an external leakage magnetic field exceeding a predetermined limit of the MRI apparatus. SOLUTION: Point sources arranged...
PURPOSE:To correct a magnetic field due to the eddy current generated when an inclined magnetic field is applied even in any pulse sequence by setting an inclined magnetic field pulse waveform itself to a waveform cancelling an eddy current magnetic field. CONSTITUTION:In a spin warp method, the...
MRI (magnetic resonance imaging) is a noninvasive diagnostic test that takes detailed images of the soft tissues of the body. Unlike X-rays or CT, images are created by using a magnetic field, radio waves, and a computer. It allows your doctor to view your spine or brain in slices, as...
A。“MRI”是“Magnetic Resonance Imaging”的缩写,意为“磁共振成像”。选项 B“Medical Research Institute”是“医学研究所”;选项 C“Modern Radiology Imaging”是“现代放射成像”;选项 D“Medical Resource Information”是“医疗资源信息”。只有 A 符合“MRI”在医学领域的特定含义。反馈...
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...