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公开(公告)号：US5545995A
公开(公告)日：1996-08-13
申请号：US346599
申请日：1994-11-29
IPC分类号： G01R33/565 , G01R33/20
CPC分类号： G01R33/56563 , G01R33/56518
摘要： A calibration procedure for correcting geometric errors in MRI images due to gradient field non-linearities and magnetic field inhomogeneities includes performing a 3D scan on a calibration phantom. The calibration phantom contains an array of tapered rods that produce an array of spots in reconstructed slice images. Spot sizes and positions enable position errors to be measured throughout the bore of the imaging system. Corrective coefficients are produced from these 3D error measurements that enable subsequent patient images to be corrected for warping errors in object position.
摘要翻译： 用于校正由于梯度场非线性和磁场不均匀性引起的MRI图像中的几何误差的校准过程包括在校准体模上执行3D扫描。 校准模型包含一系列锥形棒，其在重建的切片图像中产生点阵列。 斑点尺寸和位置使得能够在成像系统的整个孔内测量位置误差。 通过这些3D误差测量产生校正系数，使得随后的患者图像能够在物体位置纠正错误。
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公开(公告)号：US6145467A
公开(公告)日：2000-11-14
申请号：US539
申请日：1997-12-30
申请人： Gregory A. Repinski
发明人： Gregory A. Repinski
CPC分类号： G01R33/28
摘要： A magnetic field indicator mounts to an MRI system to indicate the presence of the polarizing magnetic field. An indicator wheel is mounted to a frame and is rotatable between an energized orientation in which a red colored region is seen through a window and a de-energized orientation in which a green region is aligned with the window. A weight biases the indicator wheel in the de-energized orientation and a ferrous rod rotates the wheel to its energized orientation when the polarizing field is present.
摘要翻译： 磁场指示器安装到MRI系统以指示存在偏振磁场。 指示轮被安装到框架上，并且可以在其中通过窗口看到红色区域的通电取向和其中绿色区域与窗口对准的断电取向之间旋转。 重量使指示轮在断电取向上偏移，并且当偏振场存在时，铁杆将轮转动到其赋能方向。
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公开(公告)号：US06459923B1
公开(公告)日：2002-10-01
申请号：US09718777
申请日：2000-11-22
IPC分类号： A61B500
CPC分类号： A61B6/0414 , A61B6/502 , A61G13/02
摘要： A modular intervention bed for use with a medical tomographic imaging system having an associated patient transport device and an imaging device. The modular intervention bed comprises a trestle configured to engage a patient transport device, with the trestle having an intervention area. A patient couch movably mounted on the trestle, with the patient couch defining an opening corresponding to the intervention area. The couch comprises a plurality of patient mats with each mat connected to at least one other mat, a pair of rollers mounted on each mat in a spaced apart relationship with each roller proximate an outside edge of each mat. The modular intervention bed can be reconfigured by adding or removing a mat thereby moving the intervention area and opening to correspond with the portion of a patient under investigation during an intervention procedure guided by a medical tomographic imaging system.
摘要翻译： 一种用于具有相关联的患者输送装置和成像装置的医学断层成像系统的模块化介入床。 模块化干预床包括配置成接合患者输送装置的支架，支架具有干涉区域。 可移动地安装在支架上的患者沙发，患者座椅限定对应于干预区域的开口。 沙发包括多个患者垫，每个垫连接到至少一个其它垫，一对辊以每个辊邻近每个垫的外边缘以每个辊安装在每个垫上。 模块化干预床可以通过添加或移除垫来重新配置，由此在由医学断层摄影系统引导的干预过程中移动干预区域并打开以对应于被调查患者的部分。
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公开(公告)号：US5638595A
公开(公告)日：1997-06-17
申请号：US555374
申请日：1995-11-09
IPC分类号： A61B5/055 , G01R33/38 , G01R33/385 , H01F41/06 , H01F41/00
CPC分类号： G01R33/385 , H01F41/071 , G01R33/3806 , Y10T29/4902 , Y10T29/49799
摘要： A method is provided for fabricating a gradient coil for an MR imaging system having an open magnet. The method includes forming a structure from thin conductive material such as copper, the structure generally comprising a section of a cylinder and a section of an annulus joined to an edge of the cylinder section as a flange. During a first cutting operation, a plurality of first groove segments are cut through the material, each of the first groove segments lying in one of a plurality of cutting zones selectively positioned around the structure, a strip of material positioned between two adjacent groove segments comprising a coil turn segment. The coil turn segments of a cutting zone are rigidly joined to one another and to a support frame comprising the outer edge of the structure by suitable means. Thereafter, a second cutting operation is performed, whereby a plurality of second groove segments are cut through the material to completely form the gradient coil.
摘要翻译： 提供了一种用于制造具有开放磁体的MR成像系统的梯度线圈的方法。 该方法包括从诸如铜的薄导电材料形成结构，该结构通常包括圆柱体的一部分和连接到圆筒部分的边缘的环形部分作为凸缘。 在第一切割操作期间，通过材料切割多个第一凹槽段，每个第一凹槽段位于围绕结构的多个切割区域中的一个切割区域中，位于两个相邻凹槽区段之间的材料条带包括 线圈转弯段。 切割区域的线圈转动部分通过合适的方式刚性地连接到包括结构的外边缘的支撑框架。 此后，执行第二切割操作，由此通过材料切割多个第二凹槽段以完全形成梯度线圈。
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公开(公告)号：US6026318A
公开(公告)日：2000-02-15
申请号：US984362
申请日：1997-12-03
CPC分类号： G01G19/445
摘要： A method is provided for measuring the weight of a medical imaging scanner patient. The scanner has a bore portion for receiving and housing the patient during a scan. Initially, a reclining apparatus associated with the scanner is provided, on which the patient can recline during the scan. A hydraulic lift mechanism is then used to position the reclining apparatus and the patient at bore level. The pressure within the hydraulic lift mechanism can then be measured as a function of downward force exerted by the reclining apparatus and the patient surface. Alternatively, the automatic measuring of patient mass, associated with the movement of the reclining apparatus and patient into the bore, can be determined by calculating instantaneous acceleration of the reclining apparatus and patient as the reclining apparatus and patient are slid into the bore.
摘要翻译： 提供了一种用于测量医学成像扫描仪患者的重量的方法。 扫描器具有用于在扫描期间接收和容纳患者的孔部分。 最初，提供与扫描仪相关联的倾斜装置，患者在扫描期间可以倾斜。 然后使用液压提升机构来将倾斜装置和患者定位在钻孔水平。 液压提升机构中的压力随后可以作为由斜倚装置和患者表面施加的向下的力的函数来测量。 或者，与倾斜装置和患者移动到膛孔中的移动相关联的患者质量的自动测量可以通过在斜倚装置和患者滑入孔中计算斜倚装置和患者的瞬时加速度来确定。
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