公开(公告)号：US07218113B2

公开(公告)日：2007-05-15

申请号：US11036727

申请日：2005-01-14

申请人： Thorsten Feiweier ,  Ralf Ladebeck ,  Ralph Oppelt ,  Wolfgang Renz ,  Markus Vester

发明人： Thorsten Feiweier ,  Ralf Ladebeck ,  Ralph Oppelt ,  Wolfgang Renz ,  Markus Vester

IPC分类号： G01V3/00

CPC分类号： G01R33/5612 ,  G01R33/246 ,  G01R33/543 ,  G01R33/5659

摘要： In a magnetic resonance system and an operating method therefor, a B1 field distribution of a radio-frequency antenna is measured in at least one part of a examination volume of the magnetic resonance system, and then the RF pulses emitted by the radio-frequency antenna are optimized, based on the determined B1 field distribution, for homogenization in a specific volume. An effective volume within the examination volume is determined beforehand for each applied RF pulse and, based on the determined B1 field distribution, the appertaining RF pulse is individually adjusted such that the B1 field is homogenized within the effective volume of the RF pulse.

摘要翻译： 在磁共振系统及其操作方法中，在磁共振系统的检查体积的至少一部分中测量射频天线的B 1场分布，然后RF 基于确定的B SUB场分布来优化由射频天线发射的脉冲用于在特定体积中的均匀化。 对于每个施加的RF脉冲，预先确定检查体积内的有效体积，并且基于所确定的B SUB场分布，分别调整相应的RF脉冲，使得B <1> SUB>场在RF脉冲的有效体积内均匀化。

公开(公告)号：US20060250133A1

公开(公告)日：2006-11-09

申请号：US11395251

申请日：2006-04-03

申请人： Robert Krieg ,  Rainer Kuth ,  Ralf Ladebeck ,  Ralph Oppelt ,  Wolfgang Renz ,  Sebastian Schmidt ,  Markus Vester

发明人： Robert Krieg ,  Rainer Kuth ,  Ralf Ladebeck ,  Ralph Oppelt ,  Wolfgang Renz ,  Sebastian Schmidt ,  Markus Vester

IPC分类号： G06K9/00

CPC分类号： G01R33/481 ,  G01T1/1603

摘要： A positron emission tomography unit (PET), having a unit part assigned to an examination space and a first evaluation unit, is combined with a magnetic resonance tomography unit (MRT). The unit part of the PRT includes at least two gamma ray detector units with in each case an assigned electronics unit. The MRT includes a second evaluation unit, a gradient coil system and a high frequency antenna device formed as a stripline antenna device having at least two conductors. The high frequency antenna device is arranged nearer to the examination space than the gradient coil system with a high frequency shield between the gradient coil system and the high frequency antenna device. Each conductor of the stripline antenna device respectively includes a gamma ray detector unit with an assigned electronics unit. The conductors of the stripline antenna device are configured for the respective gamma ray detector units and their assigned electronics units as shielding covers that are caused by the high frequency antenna device and are opaque to high frequency radiation. An examination object in the examination space can be imaged by the combined positron emission tomography and magnetic resonance tomography unit.

摘要翻译： 将具有分配给检查空间的单位部分和第一评估单元的正电子发射断层摄影单元（PET）与磁共振断层摄影单元（MRT）组合。 PRT的单位部分包括至少两个伽马射线检测器单元，在每种情况下都是分配的电子单元。 MRT包括第二评估单元，梯度线圈系统和形成为具有至少两个导体的带状线天线装置的高频天线装置。 高频天线装置布置成比梯度线圈系统和高频天线装置之间具有高频屏蔽的梯度线圈系统更靠近检查空间。 带状线天线装置的每个导体分别包括具有分配的电子单元的伽马射线检测器单元。 带状线天线装置的导体被配置用于相应的伽马射线检测器单元及其分配的电子单元作为由高频天线装置引起并且对高频辐射不透明的屏蔽盖。 检查空间中的检查对象可以通过组合的正电子发射断层摄影和磁共振断层摄影单元成像。

公开(公告)号：US06215382B1

公开(公告)日：2001-04-10

申请号：US09448399

申请日：1999-11-23

申请人： Ralf Ladebeck

发明人： Ralf Ladebeck

IPC分类号： H01F300

CPC分类号： H01F7/0278 ,  G01R33/383

摘要： A device for generating a magnetic field in an air gap, particularly for a magnetic resonance apparatus, has a pair of magnetic poles arranged opposite one another with the air gap therebetween. Each magnetic poles plate constructed of a number of layers successively lying on top of one another and electrically insulated from one another. Each layers is formed by plate-shaped elements of magnetically permeable material arranged next to one another and electrically insulated from one another. Successive layers are arranged offset relative to one another in in-layer directions.

摘要翻译： 用于在气隙中产生磁场的装置，特别是用于磁共振装置的装置具有彼此相对布置的一对磁极，其间具有气隙。 每个磁极板由多层连续地彼此叠置并相互电绝缘而构成。 每个层由彼此相邻布置且彼此电绝缘的导磁材料的板状元件形成。 连续的层被布置成在层间方向上相对于彼此偏移。

公开(公告)号：US5936404A

公开(公告)日：1999-08-10

申请号：US856242

申请日：1997-05-14

申请人： Ralf Ladebeck ,  Gregor Bett

发明人： Ralf Ladebeck ,  Gregor Bett

IPC分类号： A61B5/055 ,  A61B5/08 ,  G01N24/12 ,  G01R33/28 ,  G01R33/48 ,  G01V3/00

CPC分类号： G01R33/5601 ,  A61B5/055 ,  A61B5/0813 ,  G01R33/445

摘要： In a nuclear magnetic resonance tomography apparatus wherein imaging is implemented with hyperpolarized gases, a first magnet system having a high field strength for the pre-polarization of the nuclear spins is provided. A gradient system for generating magnetic field gradients and a radio-frequency arrangement for the excitation of nuclear spins in a subject as well as for the read-out of the arising nuclear magnetic resonance signals are provided in a second magnet system having lower field strength.

摘要翻译： 在使用超极化气体进行成像的核磁共振断层摄影装置中，提供了具有用于核自旋的预极化的高场强的第一磁体系统。 在具有较低场强的第二磁体系统中提供用于产生磁场梯度的梯度系统和用于激发对象中的核自旋以及用于读出所产生的核磁共振信号的射频布置。

公开(公告)号：US5304929A

公开(公告)日：1994-04-19

申请号：US982444

申请日：1992-11-27

申请人： Ming Fang ,  Ralf Ladebeck ,  Franz Schmitt ,  Michael Stehling

发明人： Ming Fang ,  Ralf Ladebeck ,  Franz Schmitt ,  Michael Stehling

IPC分类号： G01R33/561 ,  G01R33/20

CPC分类号： G01R33/5615 ,  G01R33/5616

摘要： In nuclear magnetic resonance tomography apparatus operable with a pulse sequence according to the echo-planar method, only a part of the k-space is scanned in the phase-coding direction per data acquisition, i.e., per radio-frequency excitation pulse. A phase-coding gradient is used such that regions of the k-space which are interleaved relative to each other are scanned in successive data acquisitions in the phase-coding direction. The number of echoes employed for the raw data matrix, and thus the resolution in phase-coding direction, or the length of the individual pulses of the read-out gradient, and thus the resolution in read-out direction, can thereby be enhanced.

摘要翻译： 在根据回波平面方法的脉冲序列可操作的核磁共振断层摄影装置中，每个数据采集（即，每个射频激励脉冲）仅在相位编码方向上扫描一部分k空间。 使用相位编码梯度，使得在相位编码方向上的连续数据采集中扫描相对于彼此交错的k空间的区域。 因此，可以增强用于原始数据矩阵的回波的数量，从而相位编码方向上的分辨率，读出梯度的各个脉冲的长度以及因此读出方向上的分辨率。

公开(公告)号：US10393829B2

公开(公告)日：2019-08-27

申请号：US15445276

申请日：2017-02-28

申请人： Klaus Ludwig ,  Volker Schnetter ,  Johann Sukkau ,  Andrew Dewdney ,  Axel Heitland ,  Ralf Ladebeck ,  Ronny Pflichtbeil ,  Jörg Rothard ,  Volker Weißenberger

发明人： Klaus Ludwig ,  Volker Schnetter ,  Johann Sukkau ,  Andrew Dewdney ,  Axel Heitland ,  Ralf Ladebeck ,  Ronny Pflichtbeil ,  Jörg Rothard ,  Volker Weißenberger

IPC分类号： G01R33/30 ,  G01R33/3875 ,  G01R33/44 ,  G01R33/48 ,  G01R33/24 ,  G01R33/3415

摘要： A method for determining a position of a mobile device relative to a B0 field magnet along a z-coordinate axis, and a device and a magnetic resonance tomography unit for performing the method are provided. The device includes a magnetic field strength sensor arranged in a fixed relative position. A characteristic magnetic field strength Bref of the B0 field magnet that emerges for a plurality of x-y coordinate pairs with a same reference z-coordinate zref is ascertained. The device is moved along the z-coordinate axis until the magnetic field strength sensor measures the characteristic magnetic field strength Bref.

公开(公告)号：US09753113B2

公开(公告)日：2017-09-05

申请号：US13606398

申请日：2012-09-07

申请人： Jan Ole Blumhagen ,  Matthias Fenchel ,  Ralf Ladebeck

发明人： Jan Ole Blumhagen ,  Matthias Fenchel ,  Ralf Ladebeck

IPC分类号： A61B5/055 ,  G01R33/565 ,  G01R33/48

CPC分类号： G01R33/56563 ,  A61B5/055 ,  G01R33/481 ,  G01R33/56572

摘要： In a method and magnetic resonance (MR) apparatus to image a partial region of an examination subject by means of a multislice measurement, which partial region includes at least two measurement slices, and is located at least in part at the edge of a field of view of the magnetic resonance apparatus, for each voxel to be optimized that is located at the edge of the field of view, a gradient field is configured for each measurement slice of the partial region that is to be measured and is used to acquire magnetic resonance data in the multislice measurement. The gradient field is configured so as to cause a nonlinearity of the gradient field and a B0 field inhomogeneity to cancel at each of the aforementioned voxel to be optimized at the partial region at the edge of the field of view. An image of the partial region of the examination subject is determined from the magnetic resonance data acquired in this manner.

公开(公告)号：US09134392B2

公开(公告)日：2015-09-15

申请号：US12902185

申请日：2010-10-12

申请人： James Frank Caruba ,  Ralf Ladebeck ,  Ralph Oppelt ,  Patanit Sanpitak

发明人： James Frank Caruba ,  Ralf Ladebeck ,  Ralph Oppelt ,  Patanit Sanpitak

IPC分类号： A61B6/00 ,  G01R33/48

CPC分类号： G01R33/481

摘要： Timing in a medical imaging system. The system comprises a magnetic resonance imaging (MRI) subsystem and a non-MRI subsystem. Operation of the non-MRI subsystem involves a timing signal within a radio frequency (RF) cabin of the MRI subsystem. Basing each non-MRI subsystem timing signal on a time base common between the MRI subsystem and the non-MRI subsystem. The non-MRI subsystem can be a medical imaging subsystem. The non-MRI medical imaging subsystem can be a positron emission tomography (PET) subsystem. Each non-MRI subsystem timing signal that based on the common time base can be created using the same model of equipment used for creating timing signals in the MRI subsystem. At least one stage of the non-MRI subsystem timing signal based on the common time base can be created using the same equipment used for creating timing signals in the MRI subsystem.

摘要翻译： 医学影像系统的时间安排 该系统包括磁共振成像（MRI）子系统和非MRI子系统。 非MRI子系统的操作涉及MRI子系统的射频（RF）舱内的定时信号。 在MRI子系统和非MRI子系统之间共同的时基上，按照每个非MRI子系统定时信号。 非MRI子系统可以是医学成像子系统。 非MRI医学成像子系统可以是正电子发射断层摄影（PET）子系统。 可以使用与用于在MRI子系统中创建定时信号相同的设备模型来创建基于公共时基的每个非MRI子系统定时信号。 可以使用用于在MRI子系统中创建定时信号的相同设备来创建基于公共时基的非MRI子系统定时信号的至少一个阶段。

公开(公告)号：US20130141098A1

公开(公告)日：2013-06-06

申请号：US13753894

申请日：2013-01-30

申请人： Jun Bao ,  David Faul ,  Ralf Ladebeck ,  John Thomas Pawlak ,  Elmar Rummert ,  Charles C. Watson

发明人： Jun Bao ,  David Faul ,  Ralf Ladebeck ,  John Thomas Pawlak ,  Elmar Rummert ,  Charles C. Watson

IPC分类号： G01R33/48

CPC分类号： G01R33/58 ,  G01R33/48 ,  G01R33/481 ,  G01R33/4812 ,  G01T1/1603 ,  G01T7/005

摘要： A phantom for co-registering a magnetic resonance image and a nuclear medical image is disclosed. The phantom includes a longitudinal member having a first end cap and a second end cap and a chamber contained within the longitudinal member. The chamber contains a fluid for producing a first image using a first imaging modality. The phantom further includes a first rod disposed within the chamber of the longitudinal member. The first rod contains a radioactive substance for producing a second image using a second imaging modality.

摘要翻译： 公开了用于共同配准磁共振图像和核医学图像的体模。 该体模包括具有第一端盖和第二端盖以及容纳在纵向构件内的室的纵向构件。 该腔室包含用于使用第一成像模态产生第一图像的流体。 体模还包括设置在纵向构件的腔室内的第一杆。 第一杆包含用于使用第二成像模态产生第二图像的放射性物质。

公开(公告)号：US08299438B2

公开(公告)日：2012-10-30

申请号：US12458575

申请日：2009-07-16

申请人： Matthias Fenchel ,  Ralf Ladebeck ,  Christian J. Michel ,  Charles C. Watson

发明人： Matthias Fenchel ,  Ralf Ladebeck ,  Christian J. Michel ,  Charles C. Watson

IPC分类号： G06F17/10

CPC分类号： G01R33/481 ,  A61B6/037 ,  A61B6/5235 ,  A61B6/5247 ,  G01R33/5608 ,  G06T11/005

摘要： Example embodiments are directed to a method of correcting attenuation in a magnetic resonance (MR) scanner and a positron emission tomography (PET) unit. The method includes acquiring PET sinogram data of an object within a field of view of the PET unit. The method further includes producing an attenuation map based on a maximum likelihood expectation maximization (MLEM) of a parameterized model instance and the PET sinogram data.

摘要翻译： 示例性实施例涉及一种校正磁共振（MR）扫描仪和正电子发射断层摄影（PET）单元中的衰减的方法。 该方法包括在PET单元的视野范围内获取物体的PET正弦图数据。 该方法还包括基于参数化模型实例的最大似然期望最大化（MLEM）和PET正弦图数据产生衰减图。