公开(公告)号：US20100066385A1

公开(公告)日：2010-03-18

申请号：US12585539

申请日：2009-09-17

申请人： Kirstin Jattke ,  Ralf Ladebeck ,  Christian J. Michel ,  Thorsten Speckner

发明人： Kirstin Jattke ,  Ralf Ladebeck ,  Christian J. Michel ,  Thorsten Speckner

IPC分类号： G01R27/28 ,  G01R33/48

CPC分类号： G01T1/1648 ,  A61B6/037 ,  A61B6/5247 ,  G01T1/1603

摘要： A method is disclosed for at least partly determining and/or adapting an attenuation map used for attenuation correction of Positron Emission Tomography image data sets in a combined Magnetic Resonance-Positron Emission Tomography device. In at least one embodiment of the method, at least one one-dimensional magnetic resonance data set of a patient is recorded along one imaging direction; the boundaries of at least one part of the body of the patient intersected by the imaging direction are determined from the one-dimensional magnetic resonance data set; and the attenuation map is determined and/or adapted at least partly as a function of the boundaries determined.

摘要翻译： 公开了一种用于至少部分地确定和/或调整用于组合的磁共振 - 正电子发射断层扫描装置中正电子发射断层摄影图像数据集的衰减校正的衰减图的方法。 在该方法的至少一个实施例中，沿着一个成像方向记录患者的至少一个一维磁共振数据集; 从一维磁共振数据集确定与成像方向相交的病人身体的至少一部分的边界; 并且至少部分地根据确定的边界的函数来确定和/或调整衰减图。

公开(公告)号：US20100007346A1

公开(公告)日：2010-01-14

申请号：US12458368

申请日：2009-07-09

申请人： Ralf Ladebeck

发明人： Ralf Ladebeck

IPC分类号： A61B5/055 ,  G01T1/00 ,  G01R33/20

CPC分类号： A61B5/055 ,  A61B6/037 ,  A61B6/4417 ,  A61B6/5235 ,  A61B6/5247 ,  G01R33/481

摘要： A method for determining attenuation values of an object is disclosed. In at least one embodiment, the method includes stationary positioning of the object, irradiation of the object via a radiation source, measurement of the object's transmission data via a detection system, determination of at least one geometric property of the object on the basis of the transmission data, and assignment of attenuation values to the object on the basis of the geometric property.

摘要翻译： 公开了一种用于确定物体的衰减值的方法。 在至少一个实施例中，该方法包括对象的固定定位，经由辐射源照射对象，经由检测系统测量对象的传输数据，基于该对象的至少一个几何属性的确定 传输数据，以及根据几何属性将衰减值分配给对象。

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。