公开(公告)号：US06174484B1

公开(公告)日：2001-01-16

申请号：US09193085

申请日：1998-11-16

Applicant: Paul Shadforth Thompson ,  Johannes Martinus van Oort

Inventor： Paul Shadforth Thompson ,  Johannes Martinus van Oort

IPC: B29C4300

CPC classification number: B29C43/102 ,  B29C33/3828 ,  B29C43/027 ,  B29C43/3642 ,  B29C70/446 ,  B29C70/462 ,  B29C2043/3261 ,  B29L2023/22

Abstract: A compression molding apparatus includes a mold of a first material having a first coefficient of thermal expansion and a plug of a second material having a second coefficient of thermal expansion different from the first coefficient of thermal expansion. The mold has a cavity into which the plug is placed such that the mold and plug are disposed relative to one another providing a gap therebetween having a first volume for holding a body that at least partially fills the gap when the mold and plug are at a first temperature and for molding the body into a molded product when the mold and plug are subjected to a second temperature that causes one of the first and second materials of the mold and plug to change in size more than the other and thereby change the gap to a second volume different from the first volume and compress the body.

Abstract translation: 压缩成型装置包括具有第一热膨胀系数的第一材料的模具和具有与第一热膨胀系数不同的第二热膨胀系数的第二材料的塞子。 模具具有一个空腔，塞子被放置在其中，使得模具和塞子相对于彼此设置，在它们之间设置有间隙，其间具有用于保持主体的第一容积，当模具和插头处于一个位置时，该主体至少部分地填充该间隙 第一温度，并且当模具和插头经受第二温度并使模具和插头的第一和第二材料中的一个材料的尺寸大于另一个而变化时，将主体模制成模制产品，从而将间隙改变为 第二体积不同于第一体积并压缩身体。

公开(公告)号：US6101815A

公开(公告)日：2000-08-15

申请号：US225765

申请日：1999-01-05

Applicant: Johannes Martinus van Oort ,  Paul Shadforth Thompson

Inventor： Johannes Martinus van Oort ,  Paul Shadforth Thompson

IPC: F25B21/02 ,  F25B29/00 ,  F25D21/14 ,  F25D23/12

CPC classification number: F25B21/02 ,  F25B29/00 ,  F25D21/14

Abstract: A dehumidifier for an x-ray detector includes a box having an inlet, an outlet, and a drain. A thermo-electrical element includes a cold plate disposed inside the box for cooling air channeled therethrough, and an opposite hot plate disposed outside the box for liberating heat. Air is cooled inside the box for condensing moisture therefrom which is removed by the drain, and the cooled air is heated for reducing relative humidity thereof. The resulting dry air is channeled to a housing protecting the x-ray detector.

Abstract translation: 用于X射线检测器的除湿器包括具有入口，出口和排水管的箱体。 热电元件包括​​设置在箱体内部的冷板，用于冷却通过其的通道的空气，以及设置在箱外部用于释放热量的相对的热板。 空气在箱内冷却，用于冷凝由排水口除去的水分，并且冷却的空气被加热以降低其相对湿度。 所得到的干燥空气被引导到保护x射线探测器的壳体。

公开(公告)号：US06456077B2

公开(公告)日：2002-09-24

申请号：US09795166

申请日：2001-02-28

Applicant: Johannes Martinus van Oort

Inventor： Johannes Martinus van Oort

IPC: G01V300

CPC classification number: G01R33/3873

Abstract: A method for generating a ferromagnetic shim calibration file includes the steps of performing a computation of an analytical Finite Element solution of an internal magnetic field for each location where a shim is assumed to be present in an imaging volume of a magnet, performing a computation of an equivalent magnetic dipole moment of a shim with a saturated magnetization using the analytical Finite Element solution of the internal magnetic field, making a correction of the computation of the equivalent magnetic dipole moment of the shim to compensate for an aspect ratio for the shape of the shim, making another correction of the corrected computation of the equivalent magnetic dipole moment of the shim to compensate for a magnetic mirror effect in a pole-face of the magnet, and storing all computations and corrections for each shim in a shim calibration file.

Abstract translation: 一种用于产生铁磁垫片校准文件的方法包括以下步骤：对假定存在垫片存在于磁体的成像体积中的每个位置执行内部磁场的分析有限元解的计算，执行计算 使用内部磁场的分析有限元解决方案，使用饱和磁化的垫片的等效磁偶极矩，校正垫片的等效磁偶极矩的计算，以补偿形状的纵横比 对垫片的等效磁偶极矩的校正计算进行另一次校正，以补偿磁体的极面中的磁镜效应，并将每个垫片的所有计算和校正存储在垫片校准文件中。

公开(公告)号：US06275129B1

公开(公告)日：2001-08-14

申请号：US09427325

申请日：1999-10-26

Applicant: Johannes Martinus van Oort

Inventor： Johannes Martinus van Oort

IPC: H01F700

CPC classification number: G01R33/3873 ,  G01R33/3815

Abstract: A shim assembly for a magnet and a method for making a shim assembly. A first spool has a shaft, a first rim attached to a first longitudinal end of the shaft, and a second rim attached to a second longitudinal end of the shaft. A first magnetizable tape has a predetermined length and is wound around the shaft longitudinally between the first and second rims.

Abstract translation: 用于磁体的垫片组件和用于制造垫片组件的方法。 第一卷轴具有轴，附接到轴的第一纵向端的第一轮缘和附接到轴的第二纵向端的第二轮缘。 第一可磁化带具有预定长度，并且在第一和第二边缘之间纵向缠绕在轴上。

公开(公告)号：US06707455B2

公开(公告)日：2004-03-16

申请号：US09795167

申请日：2001-02-28

Applicant: Johannes Martinus van Oort ,  Bruce Campbell Amm

Inventor： Johannes Martinus van Oort ,  Bruce Campbell Amm

IPC: G06T1120

CPC classification number: G01R33/24 ,  A61N2/00

Abstract: A method for graphical visualization of a measured magnetic field on an imaging volume of a MRI magnet includes providing data values measured at selected points of the measured magnetic field, converting each of the data values to a visualizable value based on where the data value lies within a predetermined range of data values and thus within a range of visualizable values corresponding to the range of data values, and plotting each visualizable value corresponding to each data value at a position on a grid corresponding to the position of the selected point of the measured magnetic field such that the visualizable values once plotted on the grid provide a graphical visualization of the condition of the measured magnetic field.

Abstract translation: MRI磁体的成像体积上的测量磁场的图形可视化方法包括提供在测量磁场的选定点处测量的数据值，根据数据值位于哪里，将每个数据值转换为可视化值 数据值的预定范围，因此在与数据值的范围对应的可视化值的范围内，并且对应于与所测量的磁场的所选点的位置对应的网格上的每个数据值对应的每个可视化值 使得在网格上绘制的可视化值提供了测量的磁场的状态的图形可视化。

公开(公告)号：US06255928B1

公开(公告)日：2001-07-03

申请号：US09184531

申请日：1998-11-02

Applicant: Johannes Martinus van Oort ,  Evangelos Trifon Laskaris

Inventor： Johannes Martinus van Oort ,  Evangelos Trifon Laskaris

IPC: H01F100

CPC classification number: G01R33/3873 ,  G01R33/383

Abstract: A magnet having an imaging volume, a pole piece with a laminated portion including a first surface hole, a non-magnetizable first insert with an internally-threaded hole, and a first shim with a shape of an externally-threaded bolt. The first insert is positioned in the first surface hole and is attached to the pole piece. The first shim is threaded into the hole of the first insert. Additional shims for additional inserts for additional surface holes are used to shim the magnet to reduce magnetic field inhomogeneities in the imaging volume.

Abstract translation: 具有成像体积的磁体，具有包括第一表面孔的层叠部分的极片，具有内螺纹孔的不可磁化第一插入件和具有外螺纹形状的第一垫片。 第一插入件位于第一表面孔中，并附接到极片。 第一个垫片拧入第一个插件的孔中。 用于附加表面孔的附加插入件的附加垫片用于使磁体垫片以减小成像体积中的磁场不均匀性。