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1. 发明授权

US4851779A Three dimensional volume imaging with conjugate symmetrization 失效
标题翻译：具有共轭对称性的三维体积成像
公开(公告)号：US4851779A
公开(公告)日：1989-07-25
申请号：US157972
申请日：1988-02-18
申请人： Gordon D. DeMeester , G. Neil Holland , Francis H. Bearden
发明人： Gordon D. DeMeester , G. Neil Holland , Francis H. Bearden
IPC分类号： G01R33/54 , A61B5/055 , G01R33/44 , G01R33/48 , G01R33/561 , G01R33/565
CPC分类号： G01R33/56545 , G01R33/561
摘要： An incomplete set of three dimensional magnetic resonance data is collected and stored in acquired data memory (40). The incomplete data set is complete with respect to first and second directions and incomplete with respect to a third direction. However, the acquired data set has data along the third direction between .+-.n central values and half the remaining values. One dimensional inverse Fourier transforms (64, 66) are performed with respect to the first and second directions to create an intermediate data set (68). A phase correction array or plurality of phase correction vectors p(r) are generated from the intermediate data and stored in a phase correction memory (82). A symmetric data set (100) is created as the complex conjugate of the intermediate data set. The intermediate and symmetric data sets are one dimensionally inverse Fourier transformed (96, 104) with respect to the third direction one vector at a time to produce vectors of first and second complex image arrays (f.sub.A, f.sub.S) corrected (96, 108) with the corresponding phase correction vector, and combined (110) into a line of a resultant three dimensional image representation (112).
摘要翻译：收集不完整的一组三维磁共振数据并将其存储在所获取的数据存储器（40）中。不完整的数据集相对于第一和第二方向是完整的，并且相对于第三方向是不完整的。然而，所获取的数据集具有+/- n个中心值和剩余值的一半之间沿着第三方向的数据。相对于第一和第二方向执行一维傅里叶逆变换（64,66）以创建中间数据集（68）。相位校正阵列或多个相位校正矢量p（r）从中间数据生成并存储在相位校正存储器（82）中。创建对称数据集（100）作为中间数据集的复共轭。中间对称数据集和对称数据集一次相对于第三方向一维逆变换（96,104），一次产生一个矢量，以产生校正的第一和第二复数图像阵列（f，f）的向量（96,108）相应的相位校正矢量，并将其组合（110）到所得到的三维图像表示（112）的一行中。

2. 发明授权

US5825185A Method for magnetic resonance spin echo scan calibration and reconstruction 失效
标题翻译：磁共振自旋回波扫描校准和重构方法
公开(公告)号：US5825185A
公开(公告)日：1998-10-20
申请号：US757153
申请日：1996-11-27
申请人： Haiying Liu , Francis H. Bearden , Gordon D. DeMeester
发明人： Haiying Liu , Francis H. Bearden , Gordon D. DeMeester
IPC分类号： G01R33/48 , A61B5/055 , G01R33/561 , G01R33/565 , G01V3/00
CPC分类号： G01R33/56554 , G01R33/56545
摘要： A transmitter (24) and gradient amplifiers (20) transmit radio frequency excitation and other pulses to induce magnetic resonance in selected magnetic dipoles and cause the magnetic resonance to be focused into a series of echoes (66) at each of a plurality of preselected echo positions following each excitation. A receiver (38) converts each echo into a data line. Calibration data lines having a close to zero phase-encoding are collected and used to generate correction parameters (102) for each of the echo positions. These parameters include relative echo center positions (96) and unitary complex correction vectors (106). The calibration data lines for each of the preselected positions are one-dimensionally Fourier transformed (82) and multiplied (90) by the same complex conjugate reference echo (80). These data lines are then inverse Fourier transformed (92) to generate an auxiliary data array (94). A relative echo center position is computed (96) which represents a fractional shift of the true center relative to the reference echo. A complex sum is computed (104) from the relative echo center position and normalized (106) to generate a unitary correction vector. The phase-correction parameters are used to phase-correct (116) imaging data lines. The phase-corrected imaging data lines are sorted (122) to build an image plane which is one-dimensionally Fourier transformed (128) in the phase-encoding direction to produce a final corrected image (130) for display on a monitor (134).
摘要翻译：发射器（24）和梯度放大器（20）发射射频激发和其它脉冲以在选定的磁偶极子中引起磁共振，并使磁共振聚焦成多个预选回波中的每一个的一系列回波（66）每次激发后的位置。接收器（38）将每个回波转换成数据线。收集具有接近零相位编码的校准数据线，并用于为每个回波位置产生校正参数（102）。这些参数包括相对回波中心位置（96）和单一复数校正向量（106）。用于每个预选位置的校准数据线通过相同的复共轭参考回波（80）进行一维傅立叶变换（82）并乘以（90）。这些数据线然后被逆傅里叶变换（92）以产生辅助数据阵列（94）。计算相对回波中心位置（96），其表示真实中心相对于参考回波的分数偏移。从相对回波中心位置计算复数和（104）并归一化（106）以产生单位校正向量。相位校正参数用于相位校正（116）成像数据线。对相位校正后的成像数据线进行排序（122）以构建在相位编码方向上一维付里叶变换（128）的图像平面，以产生用于在监视器（134）上显示的最终校正图像（130）。

3. 发明授权

US5073752A Discrete Fourier transform imaging 失效
标题翻译：离散傅里叶变换成像
公开(公告)号：US5073752A
公开(公告)日：1991-12-17
申请号：US510981
申请日：1990-04-19
申请人： Gordon D. DeMeester , Kenneth S. Denison , Francis H. Bearden
发明人： Gordon D. DeMeester , Kenneth S. Denison , Francis H. Bearden
IPC分类号： A61B5/055 , G01R33/48 , G01R33/54 , G01R33/56 , G06F17/14 , G06T1/00
CPC分类号： G01R33/56
摘要： Magnetic resonance imaging data lines or views are generated and stored in a magnetic resonance data memory (56). The number of views or phase encode gradient steps N along each of one or more phase encode gradient directions is selected (70) to match the dimensions of the region of interest. A discrete Fourier transform algorithm (94) operates on the data in the magnetic resonance data memory to generate an image representation for storage in an image memory (96). Unlike a fast Fourier transform algorithm which requires a.sup.N views or data lines, where a and N are integers, the discrete Fourier transform has a flexible number of data lines and data values which can be accommodated. More specifically to the preferred embodiment, the discrete Fourier transform operation is performed by a CHIRP-Z transform or a Goertzel's second order Z-transform which can accommodate any number of data lines or values.

4. 发明授权

US4833407A Scan time reduction using conjugate symmetry and recalled echo 失效
标题翻译：使用共轭对称和召回回波进行扫描时间减少
公开(公告)号：US4833407A
公开(公告)日：1989-05-23
申请号：US124040
申请日：1987-11-23
申请人： G. Neil Holland , Terrence J. Provost , Gordon D. DeMeester , Kenneth S. Denison
发明人： G. Neil Holland , Terrence J. Provost , Gordon D. DeMeester , Kenneth S. Denison
IPC分类号： A61B10/00 , A61B5/055 , G01R33/44 , G01R33/48 , G01R33/50 , G01R33/54 , G01R33/56 , G01R33/561
CPC分类号： G01R33/56 , G01R33/561 , G01R33/5602
摘要： A spin echo (52) and a gradient echo (60) are generated in each magnetic resonance sequence repetition. The spin echo is phase encoded by a phase encode gradient (44) in regular steps spanning about a quarter of k-space. More particularly, steps from -n to G.sub.max /2, where n is a small integer and G.sub.max is the maximum phase encode gradient. An off-set phase encode gradient (58) shifts the phase encoding of the gradient echo by G.sub.max /2 relative to the first phase encoding gradient. Data to fill the empty portions of k-space (142, 167) between -n and -G.sub.max are generated from the complex conjugate (140, 160), of the first echo data (74) and the second echo data (76). The first and second echo data and the complex conjugate data are transformed (122, 132, 146, 166) to generate parted image representations (124, 134, 148, 168). The first echo image representation and the corresponding conjugately symmetric image representation are phase corrected (126, 150) in accordance with a phase map ( 112) derived from the central most first echo data (78). The partial image representations are summed (170) to produce a resultant image representation (172).
摘要翻译：在每个磁共振序列重复中产生自旋回波（52）和梯度回波（60）。自旋回波由相位编码梯度（44）进行相位编码，其规则步长约为四分之一的k空间。更具体地，从-n到Gmax / 2的步骤，其中n是小整数，Gmax是最大相位编码梯度。偏移相位编码梯度（58）相对于第一相位编码梯度将梯度回波的相位编码移位Gmax / 2。从第一回波数据（74）和第二回波数据（76）的复共轭（140,160）生成-n和-Gmax之间的填充k空间（142,167）的空部分的数据。第一和第二回波数据和复共轭数据被变换（122,132,146,166）以产生分离的图像表示（124,134,148,168）。根据从中央最初回波数据（78）得到的相位图（112），第一回波图像表示和对应的共同对称图像表示被相位校正（126,150）。将部分图像表示相加（170）以产生所得到的图像表示（172）。

5. 发明授权

US4780675A Conjugate symmetry magnetic resonance imaging 失效
标题翻译：共轭对称磁共振成像
公开(公告)号：US4780675A
公开(公告)日：1988-10-25
申请号：US85956
申请日：1987-08-14
申请人： Gordon D. DeMeester , John L. Patrick , G. Neil Holland
发明人： Gordon D. DeMeester , John L. Patrick , G. Neil Holland
IPC分类号： G01R33/54 , A61B5/055 , A61B10/00 , G01R33/44 , G01R33/48 , G01R33/561 , G01R33/20
CPC分类号： G01R33/561
摘要： An incomplete set of magnetic resonance image data is collected and stored in a view memory (40). The incomplete set of image data includes a central or first set of data values (42, 42') and a side or second set of data values (44, 44'). The central data set is operated on by a roll-off filter (64) and a Fourier transform (66) to create a normalized phase map (72). The first and second data sets are Fourier transformed (82) and phase corrected (86) by being multiplied with a complex conjugate (88) of the corresponding phase map data value. A third data set (46, 46') is generated (90) by determining the complex conjugate of the second or side data set. The third data set is Fourier transformed (94) and multiplied (98) by a corresponding value from the phase map to produce a second phase corrected image representation. The first and second phase corrected image representations are summed (100) and stored in a resultant image memory (102).

6. 发明授权

US4912413A Conjugate symmetry magnetic resonance imaging 失效
标题翻译：共轭对称磁共振成像
公开(公告)号：US4912413A
公开(公告)日：1990-03-27
申请号：US260402
申请日：1988-10-20
申请人： Gordon D. DeMeester , John L. Patrick , G. Neil Holland
发明人： Gordon D. DeMeester , John L. Patrick , G. Neil Holland
IPC分类号： G01R33/54 , G01R33/561 , G01R33/565
CPC分类号： G01R33/54 , G01R33/561 , G01R33/565
摘要： An incomplete set of magnetic resonance image data is collected and stored in a view memory (40). The incomplete set of image data includes a central or first set of data values (42, 42') and half of the remaining data values (44, 44'). A symmetric data set which fills the other remaining half (46, 46') of the data values is generated (90) by determining the complex conjugate of each value of the incomplete data set. The incomplete and symmetric data sets are Fourier transformed (64, 94) to create first and second images f.sub.1 (x,y) and f.sub.2 (x,y). The first and second images are multiplied (100, 104) by conjugately symmetric phase correction values e.sup.i.phi.(x,y) and e.sup.-i.phi.(x,y) from a phase correction memory (70) to produce phase corrected images. The first and second phase corrected image representations are summed (110) and displayed (114). The phase correction values .phi.(x,y) may be derived (68) from the first image or from a phase image (86) derived (80, 82, 84) from a central or other portion of the acquired incomplete image data set.
摘要翻译：一组不完整的磁共振图像数据被收集并存储在视图存储器（40）中。不完整的图像数据集合包括中央或第一组数据值（42,42'）和剩余数据值（44,44'）的一半。通过确定不完整数据集的每个值的复共轭来生成（90）填充数据值的另一半（46,46'）的对称数据集。不完全和对称的数据集被傅里叶变换（64,94）以产生第一和第二图像f1（x，y）和f2（x，y）。第一和第二图像通过来自相位校正存储器（70）的共对称相位校正值ei phi（x，y）和e-i phi（x，y）相乘（100,104）以产生相位校正图像。将第一和第二相位校正图像表示相加（110）并显示（114）。相位校正值phi（x，y）可以从第一图像或从所获取的不完整图像数据集合的中心部分或其他部分导出（80,82,84）的相位图像（86）导出（68）。

7. 发明授权

US4881033A Noise-reduced synthetic T2 weighted images 失效
标题翻译：降噪的合成T2加权图像
公开(公告)号：US4881033A
公开(公告)日：1989-11-14
申请号：US331750
申请日：1989-04-03
申请人： Kenneth S. Denison , G. Neil Holland , Gordon D. DeMeester
发明人： Kenneth S. Denison , G. Neil Holland , Gordon D. DeMeester
IPC分类号： G01R33/50 , G01R33/56
CPC分类号： G01R33/5602 , G01R33/482 , G01R33/5608 , G01R33/56554
摘要： A multi-echo magnetic resonance imaging sequence is implemented such that a radio frequency receiver (34) receives magnetic resonance signals during each of a plurality of magnetic resonance echoes. The resonance data received during each echo are digitized and the resultant echo data are stored in a corresponding echo memory (40, 42). The locations of the data within the memories are brought into registration (52) such that corresponding data in each memory is disposed at the same memory address. Because data from later echoes tends to be weaker or at a lower magnitude, the magnitude of the data stored in each memory is normalized (60). The phase of the data in each memory is brought into coordination by a zero order phase correction (70). A high pass filter (84) and a complementary low pass filter (86) separate complementary portions of the data from the memories. The separated portions are combined into a single synthesizied data set for storage in memory (82). The syntheized data are Fourier transformed (100) to produce a synthetic image which has selected characteristics of an early echo image, e.g. high resolution, and selected characteristics of a late echo image, e.g. good T2 contrast. In this manner, the synthetic image has properties or characteristics which render it more diagnostically valuable than either an early or late echo image.
摘要翻译：实现多回波磁共振成像序列，使得射频接收器（34）在多个磁共振回波中的每一个期间接收磁共振信号。在每个回波期间接收到的共振数据被数字化，并且所得到的回波数据被存储在对应的回波存储器（40,42）中。将存储器内的数据的位置进行注册（52），使得每个存储器中的对应数据被布置在相同的存储器地址处。因为来自后期回波的数据趋向于较弱或处于较低幅度，所以存储在每个存储器中的数据的幅度被归一化（60）。通过零阶相位校正（70）使每个存储器中的数据的相位协调。高通滤波器（84）和互补低通滤波器（86）将数据与存储器的互补部分分开。分离的部分被组合成单个合成的数据集合以存储在存储器（82）中。合成数据经傅里叶变换（100）以产生合成图像，该合成图像选择早期回波图像的特征，例如，高分辨率和晚期回波图像的选定特征，例如。良好的T2对比度。以这种方式，合成图像具有使其比早期或晚期回波图像更具诊断价值的性质或特征。

8. 发明授权

US08525116B2 MR/PET imaging systems 有权
标题翻译： MR / PET成像系统
公开(公告)号：US08525116B2
公开(公告)日：2013-09-03
申请号：US12670256
申请日：2008-06-23
申请人： Volkmar Schulz , Torsten J. Solf , Gordon D. DeMeester , Michael A. Morich
发明人： Volkmar Schulz , Torsten J. Solf , Gordon D. DeMeester , Michael A. Morich
IPC分类号： G01T1/164 , G01T1/24 , A61B5/05
CPC分类号： G01T1/1603
摘要： An imaging system includes positron emission tomography (PET) detectors (30) shrouded by broadband galvanic isolation (99) and coincidence detection electronics (50, 50ob), or other radiation detectors. A magnetic resonance scanner includes a main magnet (12, 14) and magnetic field gradient assembly (20, 20′, 22, 24) configured to acquire imaging data from a magnetic resonance examination region at least partially overlapping the examination region surrounded by the PET detectors. A radio frequency coil (80, 100) has plurality of conductors (66, 166) and a radio frequency screen (88, 188, 188EB, 188F) substantially surrounding the conductors to shield the coil at the magnetic resonance frequency. The radiation detectors are outside of the radio frequency screen. Magnetic resonance-compatible radiation collimators or shielding (60, 62) containing an electrically non-conductive and non-ferromagnetic heavy atom oxide material are disposed with the radiation detectors.
摘要翻译：一种成像系统包括由宽带电流隔离（99）和重合检测电路（50,50ob）或其他辐射检测器覆盖的正电子发射断层摄影（PET）检测器（30）。磁共振扫描仪包括主磁体（12,14）和磁场梯度组件（20,20'，22,24），其被配置为从至少部分地与由PET包围的检查区域重叠的磁共振检查区域获取成像数据探测器射频线圈（80,100）具有基本上围绕导体以屏蔽线圈的磁共振频率的多个导体（66,166）和射频屏（88,188,188EB，188F）。辐射探测器在射频屏幕之外。磁辐射准直仪或包含非导电和非铁磁重原子氧化物材料的屏蔽（60,62）与辐射探测器一起设置。

9. 发明申请

US20110115483A1 TRANSMIT/RECEIVE COIL FOR ULTRA-HIGH FIELD MRI 有权
标题翻译：用于超声场MRI的发射/接收线圈
公开(公告)号：US20110115483A1
公开(公告)日：2011-05-19
申请号：US12742976
申请日：2008-12-12
申请人： Zhiyong Zhai , Robert Gauss , Eddy Yu Ping WONG , Michael A. Morich , Kevin M. Nieman , Gordon D. DeMeester
发明人： Zhiyong Zhai , Robert Gauss , Eddy Yu Ping WONG , Michael A. Morich , Kevin M. Nieman , Gordon D. DeMeester
IPC分类号： G01R33/44
CPC分类号： G01R33/3415 , G01R33/5659
摘要： A magnetic resonance coil comprises a first set of coil elements (54, 56, 80) operatively connectable with a transmit channel (66, 74) to couple with a transmit region of sensitivity for a selected load at a magnetic field strength greater than 3 Tesla, and a second set of coil elements (52, 54, 82) operatively connectable with a receive channel (66, 74) to couple with a receive region of sensitivity for the selected load at the magnetic field strength greater than 3 Tesla. The first set of coil elements is arranged proximate to but not surrounding the transmit region of sensitivity, and the second set of coil elements is arranged proximate to but not surrounding the receive region of sensitivity. The first set of coil elements and the second set of coil elements having at least one coil element (52, 56) not in common. The first and second sets of coil elements define transmit and receive regions of sensitivity for the selected load at the magnetic field strength greater than 3 Tesla that are substantially similar.
摘要翻译：磁共振线圈包括可操作地与发射通道（66,74）连接的第一组线圈元件（54,56,80），以在大于3特斯拉的磁场强度下与选定负载的灵敏度的发射区域耦合以及第二组线圈元件（52,54,82），其可操作地与接收通道（66,74）连接，以在大于3特斯拉的磁场强度下与所选择的负载的接收灵敏度区域耦合。第一组线圈元件布置成靠近但不围绕灵敏度的发射区域，并且第二组线圈元件布置成接近但不包围灵敏度的接收区域。第一组线圈元件和第二组线圈元件具有不共同的至少一个线圈元件（52,56）。第一组和第二组线圈元件在大于3特斯拉的大于3特斯拉的磁场强度下为所选择的载荷定义灵敏度的发射和接收区域。

10. 发明授权

US07495443B2 RF coil system for super high field (SHF) MRI 有权
标题翻译：射频线圈系统用于超高场（SHF）MRI
公开(公告)号：US07495443B2
公开(公告)日：2009-02-24
申请号：US10595862
申请日：2004-11-03
申请人： Christoph G. Leussler , Christian Findeklee , Michael A. Morich , Zhiyong Zhai , Gordon D. DeMeester
发明人： Christoph G. Leussler , Christian Findeklee , Michael A. Morich , Zhiyong Zhai , Gordon D. DeMeester
IPC分类号： G01V3/00
CPC分类号： G01R33/3415 , G01R33/34046 , G01R33/34076 , G01R33/345 , G01R33/3453 , G01R33/3635 , G01R33/3642 , G01R33/365 , G01R33/3678 , G01R33/422 , G01R33/5659
摘要： A radio frequency coil system (38) for magnetic resonance imaging includes a plurality of parallel spaced apart rungs (60) which each includes rung capacitors (68). An end cap (64) is disposed at a closed end (66) of the coil system (38). An RF shield (62) is connected to the end cap (64) and surrounds the rungs (60), extending in a direction substantially parallel to rungs (60). The RF coil system (38) may be used as birdcage, TEM, hybrid, combination birdcage and TEM, or other.
摘要翻译：一种用于磁共振成像的射频线圈系统（38）包括多个平行隔开的梯级（60），每个梯级包括梯级电容器（68）。端盖（64）设置在线圈系统（38）的封闭端（66）处。 RF屏蔽（62）连接到端盖（64）并且围绕梯级（60）沿着基本平行于梯级（60）的方向延伸。 RF线圈系统（38）可以用作鸟笼，TEM，混合，组合鸟笼和TEM等。

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