公开(公告)号：US07288939B1

公开(公告)日：2007-10-30

申请号：US11504845

申请日：2006-08-16

申请人： Thomas M. Barbara ,  Alexander M. J. Hudson ,  Atholl A. V. Gibson

发明人： Thomas M. Barbara ,  Alexander M. J. Hudson ,  Atholl A. V. Gibson

IPC分类号： G01V3/00

CPC分类号： G01R33/31 ,  G01R33/34 ,  G01R33/34023 ,  G01R33/3403

摘要： The thermal performance and vacuum properties of a cryogenic NMR probe are improved when thermal control is implemented by conductive heat transfer to a cold head cooled by a heat exchanger to below the selected operating temperature. The heat load is manipulated by locating a heater to produce a more nearly constant heat load in conjunction with pulsed RF power and in one embodiment transferring such heater power through a common thermal path. In another embodiment, the heater power is conductively transferred directly to the heat exchanger.

摘要翻译： 当通过导热传递到由热交换器冷却到低于所选操作温度的冷头进行热控制时，低温NMR探头的热性能和真空特性得到改善。 通过定位加热器以结合脉冲RF功率产生更接近恒定的热负荷来操纵热负荷，并且在一个实施例中通过共同的热路径传递这种加热器功率。 在另一个实施例中，加热器功率被直接传导到热交换器。

公开(公告)号：US4590427A

公开(公告)日：1986-05-20

申请号：US479581

申请日：1983-03-28

申请人： Eiichi Fukushima ,  Stephen B. W. Roeder ,  Roger A. Assink ,  Atholl A. V. Gibson

发明人： Eiichi Fukushima ,  Stephen B. W. Roeder ,  Roger A. Assink ,  Atholl A. V. Gibson

IPC分类号： A61B10/00 ,  A61B5/055 ,  G01R33/34 ,  G01R33/483 ,  G01R33/20

CPC分类号： G01R33/34053 ,  G01R33/4831 ,  Y10S505/844

摘要： An improved nuclear magnetic resonance (NMR) apparatus for use in topical magnetic resonance (TMR) spectroscopy and other remote sensing NMR applications includes a semitoroidal radio-frequency (rf) coil. The semitoroidal rf coil produces an effective alternating magnetic field at a distance from the poles of the coil, so as to enable NMR measurements to be taken from selected regions inside an object, particularly including human and other living subjects. The semitoroidal rf coil is relatively insensitive to magnetic interference from metallic objects located behind the coil, thereby rendering the coil particularly suited for use in both conventional and superconducting NMR magnets. The semitoroidal NMR coil can be constructed so that it emits little or no excess rf electric field associated with the rf magnetic field, thus avoiding adverse effects due to dielectric heating of the sample or to any other interaction of the electric field with the sample.

摘要翻译： 用于局部磁共振（TMR）光谱学和其他遥感NMR应用的改进的核磁共振（NMR）装置包括半静态射频（RF）线圈。 该半导体线圈线圈产生与线圈两极距离的有效交变磁场，以便能够从物体内的特定区域（特别是包括人类和其他活体）中选出NMR测量。 对于位于线圈后面的金属物体的磁干扰，该半静态线圈相对不敏感，从而使线圈特别适用于常规和超导NMR磁体。 可以构造该血管内核磁共振线圈，以使其发射与rf磁场相关的很少或没有过剩的rf电场，从而避免由于样品的介电加热或电场与样品的任何其它相互作用而引起的不利影响。