公开(公告)号：WO2016183572A1

公开(公告)日：2016-11-17

申请号：PCT/US2016/032671

申请日：2016-05-16

Applicant: OHIO STATE INNOVATION FOUNDATION

Inventor： WANG, Jinghua ,  DING, Yu

IPC: G01R33/48 ,  G01R33/563 ,  G01V3/00 ,  G06K9/00

CPC classification number: G01R33/246 ,  G01R33/5659 ,  G01V3/14

Abstract: Systems and methods for estimating complex transmit field B 1 + of a transmit coil of a magnetic resonance imaging (MRI) system in both k-space and image domains are described herein. Estimating complex RF field B 1 + in the k-space domain includes acquiring complex data in a k-space domain, estimating a complex B 1 + map in the k-space domain of a transmit coil and storing the complex B 1 + map. The complex B 1 + map can be estimated based on the complex images. Estimating complex transmit field B 1 + in the image domain includes acquiring at least two complex images in a k-space domain, transforming the complex images into an image domain, estimating a complex B 1 + map in the image domain of a transmit coil, and storing the complex B 1 + map.

Abstract translation: 本文描述了用于估计k空间和图像域中的磁共振成像（MRI）系统的发射线圈的复发射场B1 +的系统和方法。 估计k空间域中的复射频场B1 +包括获取k空间域中的复数数据，估计发射线圈的k空间域中的复数B1 +映射并存储复数B1 +映射。 可以基于复杂图像来估计复杂的B1 +图。 估计图像域中的复数发送字段B1 +包括获取k空间域中的至少两个复数图像，将复杂图像变换成图像域，估计发送线圈的图像域中的复数B1 +映射，以及存储 复合B1 +地图。

公开(公告)号：WO2016180983A1

公开(公告)日：2016-11-17

申请号：PCT/EP2016/060920

申请日：2016-05-13

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： KARAMPINOS, Dimitrios ,  RUSCHKE, Stefan ,  KOOIJMAN-KURFUERST, Hendrik ,  HOLGER, Eggers

IPC: G01R33/48 ,  G01R33/561 ,  G01R33/565

CPC classification number: G01R33/4828 ,  G01R33/5615 ,  G01R33/5616 ,  G01R33/56581

Abstract: The invention relates to a method of MR imaging of an object placed in an examination volume of a MR device (1). It is an object of the invention to provide a multi echo imaging technique that avoids artifacts and/or errors due the concomitant gradient- induced phase error effect. The method of the invention comprises the steps of: a) generating echo signals at different echo times by subjecting the object to a multi-echo imaging sequence of at least one RF pulse and switched magnetic field gradients; b) acquiring the echo signals; c) correcting the acquired echo signals for concomitant gradient-induced phase errors, which comprises: reconstructing a complex MR image for each echo time from the echo signals generated at this echo time; computing the accumulated concomitant gradient-induced phase error for each echo time and for each image position from the gradient waveforms of the imaging sequence; and - applying a phase correction to each voxel of each of the MR images according to the computed accumulated concomitant gradient-induced phase error for the respective echo time and image position. Moreover, the invention relates to a MR device (1) and to a computer program to be run on a MR device (1).

Abstract translation: 本发明涉及放置在MR装置（1）的检查体积中的物体的MR成像方法。 本发明的目的是提供一种多回波成像技术，其避免伴随的梯度引起的相位误差效应造成的伪像和/或误差。 本发明的方法包括以下步骤：a）通过对象进行至少一个RF脉冲和切换磁场梯度的多回波成像序列，产生不同回波时间的回波信号; b）获取回波信号; c）校正所获取的回波信号以用于伴随的梯度诱发相位误差，其包括：从在该回波时间产生的回波信号中重构每个回波时间的复数MR图像; 根据成像序列的梯度波形计算每个回波时间和每个图像位置的累积伴随梯度相位误差; 以及 - 根据相应的回波时间和图像位置的计算出的累积伴随梯度诱发相位误差，对每个MR图像的每个体素施加相位校正。 此外，本发明涉及MR装置（1）以及要在MR装置（1）上运行的计算机程序。

公开(公告)号：WO2016172691A1

公开(公告)日：2016-10-27

申请号：PCT/US2016/029179

申请日：2016-04-25

Applicant: MASSACHUSETTS INSITUTE OF TECHNOLOGY ,  CHILDREN'S MEDICAL CENTER CORPORATION ,  UNIVERSIDAD REY JUAN CARLOS

Inventor： LUO, Jie ,  ABACI TURK, Esra ,  GRANT, Patricia, Ellen ,  MALPICA, Norberto ,  ADALSTEINSSON, Elfar

IPC: G01R33/563 ,  G01R33/565 ,  G01R33/56 ,  A61B5/055 ,  G01R33/48

CPC classification number: A61B5/4362 ,  A61B5/055 ,  A61B5/14542 ,  A61B5/4343 ,  A61B5/7282 ,  A61B5/7485 ,  A61B2576/00 ,  G01R33/4806 ,  G01R33/4833 ,  G01R33/50 ,  G01R33/5608 ,  G01R33/5616 ,  G01R33/56366 ,  G01R33/56509 ,  G06K9/4604 ,  G06T7/0012 ,  G06T7/37 ,  G06T2207/10088

Abstract: A method is provided for generating images using a MRI system. The method includes one or more acts below. First, the MRI system applies a pulse sequence to obtain a first set of blood oxygenation level dependent (BOLD) MRI images of a pregnant subject during a first time period. The MRI system then applies the pulse sequence to obtain a second set of BOLD MRI images of the pregnant subject during a second time period. The MRI system automatically extracts one or more regions of interest that include a placenta of the pregnant subject in the first and second sets of BOLD MRI images. The MRI system obtains BOLD signal changes in the one or more regions of interest based on the first and second sets of BOLD MRI images. The MRI system generates, based on the BOLD signal changes, a map indicating placental oxygen transport.

Abstract translation: 提供了一种使用MRI系统生成图像的方法。 该方法包括以下一个或多个动作。 首先，MRI系统应用脉冲序列以在第一时间段内获得怀孕对象的第一组血氧水平依赖（BOLD）MRI图像。 MRI系统然后施加脉冲序列以在第二时间段内获得怀孕对象的第二组BOLD MRI图像。 MRI系统在第一组和第二组BOLD MRI图像中自动提取包括怀孕受试者的胎盘的一个或多个感兴趣区域。 MRI系统基于第一组和第二组BOLD MRI图像获得一个或多个感兴趣区域中的BOLD信号变化。 MRI系统基于BOLD信号变化产生指示胎盘氧运输的图。

公开(公告)号：WO2016058876A3

公开(公告)日：2016-10-13

申请号：PCT/EP2015073107

申请日：2015-10-07

Applicant: SIRONA DENTAL SYSTEMS GMBH

Inventor： RASCHE VOLKER ,  WUNDRAK STEFAN

IPC: G01R33/48 ,  G01R33/561 ,  G01R33/565

CPC classification number: G01R33/5614 ,  G01R33/4824 ,  G01R33/56518

Abstract: The invention relates to method for generating an MRI image in which a radial or spiral k-chamber path with a constant angular increment Psi is used to take an MRI image, the angular increment Psi being in the angular range of between 5 - 55 degrees or being in the corresponding supplementary angle Psi' and is selected according to the formula PsiN,M= pi / (N+1/ (M + tau - 1)). Alternatively, for an angular increment Psi which deviates from the angle increment of the optimal distribution of n radial profiles Psio p t = 180°/n, the minimum scanning efficiency of the angular increment Psi for n > 21 profiles is greater than 0.95, the angular increment Psi is in an angular range of 5 to less than 68,7537°, in particular between 5 - 55 degrees or in the corresponding supplementary angle Psi'. Compared to the arrangement of the radial or spiral profile using the golden angle of 111,24°, the angle increments calculated according to the above formula lead to lower eddy current artifacts, for example during the use of a b-SSFP-pulse sequence.

Abstract translation: 一种制备MRI扫描，以创建在其中一个径向或螺旋k空间轨迹以恒定角度增量帕普西MRI图像中使用的过程，是在从5到55度的角度的角增量PSI或相应的补角帕普西 “和根据式PSIN选择，M = PI /（N + 1 /（M + tau蛋白 - 1））。 可替换地，角增量是Psi和从n个径向型面的最优分布的角度增量不同Psiopt = 180°/ n，其中所述角增量帕普西的最小采样效率比0.95对于n> 21条型材，在幽的角增量更大 角度的范围为5至小于68.7537°，尤其是5至55度或相应的补角PSI”。 与使用的111.24°金角度径向或螺旋形轮廓的布置中，在比较根据上述式角增量导致降低涡电流的工件，例如使用B SSFP脉冲序列作为时计算。

公开(公告)号：WO2016151146A1

公开(公告)日：2016-09-29

申请号：PCT/EP2016/056742

申请日：2016-03-28

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： WEISS, Steffen

IPC: G01R33/48 ,  A61B5/055 ,  G01R33/50

CPC classification number: G01R33/4804 ,  A61B5/015 ,  A61B5/055 ,  A61B18/02 ,  A61B18/12 ,  A61B18/1815 ,  A61B18/20 ,  A61B34/25 ,  A61B90/37 ,  A61B2018/00714 ,  A61B2018/00791 ,  G01R33/50 ,  G01R33/5608

Abstract: The invention provides for a method of operating a medical instrument (100, 400, 500, 600), with magnetic resonance imaging system (102). The method comprises acquiring (202) equilibrium magnetization magnetic resonance imaging data (148) by controlling the magnetic resonance imaging system according to a T1 measuring magnetic resonance imaging protocol and calculating an equilibrium magnetization baseline image (156). The method further comprises repeatedly acquiring (206) the dynamic PRFS magnetic resonance data according to a proton resonance frequency shift magnetic resonance imaging protocol. The method further comprises repeatedly acquiring (208) magnetic resonance data portions (152) according to the T1 measuring magnetic resonance imaging protocol with a saturation preparation (804) at the start of the acquisition. The acquisition of the dynamic PRFS magnetic resonance data and the magnetic resonance data portions are interleaved. The method further comprises repeatedly reassembling (212) the resonance data portions into dynamic T1 magnetic resonance data. The method further comprises repeatedly calculating (214) a T1 map (158) using the reassembled dynamic T1 magnetic resonance data and the equilibrium magnetization image. The method further comprises repeatedly calculating (216) a PRFS phase calibration (160) using the dynamic PRFS magnetic resonance data and the T1 map. The method further comprises repeatedly calculating (218) a PRFS temperature map (162) using the dynamic PRFS magnetic resonance data and the PRFS phase calibration if the PRFS phase calibration has been calculated.

Abstract translation: 本发明提供了一种用磁共振成像系统（102）操作医疗器械（100,400,500,600）的方法。 该方法包括通过根据T1测量磁共振成像协议控制磁共振成像系统并计算平衡磁化基线图像（156）来获取（202）平衡磁化磁共振成像数据（148）。 该方法还包括根据质子共振频移磁共振成像协议反复获取（206）动态PRFS磁共振数据。 该方法还包括在采集开始时根据具有饱和准备（804）的T1测量磁共振成像协议重复获取（208）磁共振数据部分（152）。 动态PRFS磁共振数据和磁共振数据部分的获取被交织。 该方法还包括将共振数据部分重复地重新组装（212）到动态T1磁共振数据中。 该方法还包括使用重新组合的动态T1磁共振数据和平衡磁化图像重复计算（214）T1图（158）。 该方法还包括使用动态PRFS磁共振数据和T1映射重复计算（216）PRFS相位校准（160）。 该方法还包括如果已经计算了PRFS相位校准，则使用动态PRFS磁共振数据和PRFS相位校准重复计算（218）PRFS温度图（162）。

公开(公告)号：WO2016105924A1

公开(公告)日：2016-06-30

申请号：PCT/US2015/064371

申请日：2015-12-08

Applicant: SCHLUMBERGER CANADA LIMITED ,  SERVICES PETROLIERS SCHLUMBERGER ,  SCHLUMBERGER TECHNOLOGY B.V. ,  SCHLUMBERGER TECHNOLOGY CORPORATION

Inventor： DONALDSON, Marus Hofheins ,  FREED, Denise E. ,  HURLIMANN, Martin D. ,  SONG, Yi-Qiao ,  VENKATARAMANAN, Lalitha

IPC: G01N24/08 ,  G01R33/48 ,  G01R33/485 ,  G01R33/50

CPC classification number: G01N24/081

Abstract: Methods are provided for identifying one or more transition characteristics in a hydrocarbon fluid such as asphaltene onset pressure (AOP), bubble point or dew point. A transition characteristic is determined by subjecting the fluid to different pressures or temperatures, conducting NMR tests at the different pressures or temperatures to obtain signals, processing the signals to obtain values of a function of an NMR parameter as a function of pressure or temperature, and analyzing the values to find a discontinuity that identifies the transition characteristic. In embodiments, the NMR parameters may include at least one of a relaxation parameter such as T 2 or a T 1 -T 2 ratio, a diffusion parameter and an initial magnetization parameter. In embodiments, dual linear fitting, Bayesian change point detection algorithms, and instantaneous slope analysis may be utilized to analyze the values in order to find a discontinuity.

Abstract translation: 提供了用于识别烃流体中的一种或多种过渡特性的方法，例如沥青质起始压力（AOP），泡点或露点。 通过使流体经受不同的压力或温度，在不同的压力或温度进行NMR测试以获得信号，处理信号以获得作为压力或温度的函数的NMR参数的函数的值来确定转变特性，以及 分析值以找到识别转换特征的不连续性。 在实施方案中，NMR参数可以包括诸如T 2或T 1 -T 2比的松弛参数，扩散参数和初始磁化参数中的至少一个。 在实施例中，可以使用双线性拟合，贝叶斯变化点检测算法和瞬时斜率分析来分析这些值以找到不连续性。

公开(公告)号：WO2016077075A1

公开(公告)日：2016-05-19

申请号：PCT/US2015/058005

申请日：2015-10-29

Applicant: BETH ISRAEL DEACONESS MEDICAL CENTER INC.

Inventor： BASHA, Tamer ,  NEZAFAT, Reza

IPC: G01R33/48

CPC classification number: G01R33/5602 ,  G01R33/36 ,  G01R33/385 ,  G01R33/4835 ,  G01R33/4838 ,  G01R33/50 ,  G01R33/5613 ,  G01R33/5673

Abstract: An MRI method includes performing a first image acquisition module of a pulse sequence to acquire a first MR data from slices disposed at different locations in a region of interest (ROI) of an object; performing a second image acquisition module of the pulse sequence, to acquire a second MR data from the slices disposed at the different locations of the ROI, with a T2 preparation time different than that of the first image acquisition module; and generating a T2 map based on the acquired first MR data and the acquired second MR data.

Abstract translation: MRI方法包括执行脉冲序列的第一图像获取模块，以从设置在对象的感兴趣区域（ROI）中的不同位置的切片获取第一MR数据; 执行所述脉冲序列的第二图像获取模块，从具有不同于所述第一图像采集模块的T2准备时间的所述ROI的不同位置处的所述切片获取第二MR数据; 以及基于所获取的第一MR数据和所获取的第二MR数据生成T2映射。

公开(公告)号：WO2014144399A9

公开(公告)日：2016-04-21

申请号：PCT/US2014028792

申请日：2014-03-14

Applicant: VIEWRAY INC

Inventor： DEMPSEY JAMES F ,  SHVARTSMAN SHMARYU M

IPC: A61N5/10 ,  G01R33/48

CPC classification number: A61N5/1049 ,  A61N2005/1055 ,  A61N2005/1094 ,  G01R33/3607 ,  G01R33/3806 ,  G01R33/421 ,  G01R33/422 ,  G01R33/4808 ,  Y10T29/49018

Abstract: Systems and methods for the delivery of linear accelerator radiotherapy in conjunction with magnetic resonance imaging in which components of a linear accelerator may be placed in shielding containers around a gantry, may be connected with RF waveguides, and may employ various systems and methods for magnetic and radio frequency shielding.

Abstract translation: 用于将线性加速器放射治疗与磁共振成像一起提供的系统和方法，其中线性加速器的部件可以放置在机架周围的屏蔽容器中，可以与RF波导连接，并且可以采用各种系统和方法用于磁和 射频屏蔽。

公开(公告)号：WO2016001836A3

公开(公告)日：2016-03-17

申请号：PCT/IB2015054905

申请日：2015-06-30

Applicant: KONINKL PHILIPS NV

Inventor： HUANG FENG ,  DUENSING GEORGE RANDALL ,  ZHANG BIDA

IPC: G01R33/565 ,  G01R33/48 ,  G01R33/563

CPC classification number: G01R33/56509 ,  G01R33/4818 ,  G01R33/5608 ,  G01R33/5616 ,  G01R33/56341

Abstract: Reduction of artifacts caused by inter-shot motion in multi-shot MRI (e.g. DWI). To this end, the invention teaches a magnetic resonance (MR) imaging (MRI) system (100, 1500), including at least one controller (110, 1510) configured to: perform a multi-shot image acquisition process to acquire MR information for at least one multi-shot image set; train a convolution kernel comprising data on at least a portion of the MR information obtained without the use of the gradient or by using a self-training process, the convolution kernel including convolution data; iteratively convolve the MR information obtained with the use of a gradient for at least two of the image shots of the at least one multi-shot image set with the trained convolution kernel; project the synthetic k-space data for the at least two image shots of the at least one multi-shot image set into image space; and average the projected synthetic k-space data that are projected into the image space to form image information.

Abstract translation: 减少由多次MRI（例如DWI）中的拍摄间移动引起的伪像。 为此，本发明教导了包括至少一个控制器（110,1510）的磁共振（MR）成像（MRI）系统（100,1500），该至少一个控制器被配置为：执行多次拍摄图像获取过程以获取MR信息 至少一个多镜头图像集合; 训练卷积核，其包括在不使用所述梯度的情况下获得的所述MR信息的至少一部分上的数据，或者通过使用自训练过程，所述卷积核包括卷积数据; 迭代地卷积使用对训练的卷积核心的至少一个多拍摄图像集合的图像拍摄中的至少两个的梯度获得的MR信息; 将所述至少一个多画面图像集的所述至少两个图像拍摄的合成k空间数据投影到图像空间中; 并且将投影到图像空间中的投影合成k空间数据的平均化以形成图像信息。

公开(公告)号：WO2015181091A3

公开(公告)日：2016-01-21

申请号：PCT/EP2015061441

申请日：2015-05-22

Applicant: KONINKL PHILIPS NV

Inventor： BECK GABRIELE MARIANNE ,  HUANG ALAN JERRY ,  VAN IJPEREN GERRIT HENDRIK

IPC: G01R33/48 ,  G01R33/50 ,  G01R33/56 ,  G01R33/561 ,  G01R33/565

CPC classification number: G01R33/4818 ,  G01R33/4828 ,  G01R33/50 ,  G01R33/56 ,  G01R33/5615 ,  G01R33/5616 ,  G01R33/5617 ,  G01R33/5618 ,  G01R33/56509

Abstract: The invention relates to a method of MR imaging of at least an object (10) placed in an examination volume of a MR device (1). It is an object of the invention to enable fast MR imaging using a multi-echo imaging technique which is robust with respect to motion. The method of the invention comprises the steps of: - generating echo signals by subjecting the object (10) to an imaging sequence, - acquiring the echo signals, each echo signal being attributed to a k-space line, wherein a number of k-space lines, which are adjacently arranged in a part of k-space, are repeatedly sampled, with said number of k-space lines being sampled in a different sequential order per repetition, and - reconstructing a MR image from the acquired echo signals. Moreover, the invention relates to a MR device for carrying out this method as well as to a computer program to be run on a MR device.

Abstract translation: 本发明涉及放置在MR装置（1）的检查体积中的至少一个物体（10）的MR成像方法。 本发明的目的是使用相对于运动鲁棒的多回波成像技术来实现快速MR成像。 本发明的方法包括以下步骤： - 通过使物体（10）经受成像序列产生回波信号， - 获取回波信号，每个回波信号归因于k-空间线，其中多个k- 相邻地布置在k空间的一部分中的空间线被重复采样，其中所述数量的k空间线以每次重复的不同顺序的顺序被采样，以及 - 从获取的回波信号重构MR图像。 此外，本发明涉及用于执行该方法的MR设备以及要在MR设备上运行的计算机程序。