公开(公告)号：US20080009710A1

公开(公告)日：2008-01-10

申请号：US11883700

申请日：2006-02-07

申请人： Hiroyuki Itagaki ,  Tetsuhiko Takahashi

发明人： Hiroyuki Itagaki ,  Tetsuhiko Takahashi

IPC分类号： A61B5/055

CPC分类号： G01R33/4836 ,  G01R33/446 ,  G01R33/4835

摘要： A magnetic resonance imaging method includes a step (1) for exciting atomic nuclei in a desired region of an object to be examined so as to cause nuclear magnetic resonance, a step (2) for detecting a nuclear magnetic resonance signal generated in the blood, and a step (3) for extracting a blood image of the object by the detected nuclear magnetic resonance signal. The desired region excited by the step (1) represents a plurality of regions arranged at a predetermined interval.

摘要翻译： 磁共振成像方法包括：步骤（1），用于激发待检测物体的期望区域中的原子核以引起核磁共振;步骤（2），用于检测在血液中产生的核磁共振信号， 以及用于通过检测到的核磁共振信号提取物体的血液图像的步骤（3）。 由步骤（1）激发的期望区域表示以预定间隔布置的多个区域。

公开(公告)号：US20070247155A1

公开(公告)日：2007-10-25

申请号：US11379403

申请日：2006-04-20

申请人： Yudong Zhu

发明人： Yudong Zhu

IPC分类号： G01V3/00

CPC分类号： G01R33/583 ,  G01R33/288 ,  G01R33/3415 ,  G01R33/4833 ,  G01R33/4836 ,  G01R33/5611 ,  G01R33/5612 ,  G01R33/5659

摘要： A computer readable storage medium in an example has a computer program stored thereon and represents a set of instructions that when executed by a computer during MR imaging causes the computer to: acquire a B1 field map for each transmit coil of a parallel RF transmit coil array; determine with a computational algorithm an excitation pulse scheme for a target excitation profile based on at least one effective B1 field map for a plurality of transmit coils of the parallel RF transmit coil array; and generate at least one SAR-reduced RF pulsing sequence for a respective transmit coil of the plurality of transmit coils of the parallel RF transmit coil array. The parallel RF transmit coil array is capable of having any parallel RF transmit coil array geometry. Each effective B1 field map reflects inductive coupling effects present between a transmit coil and at least another transmit coil.

摘要翻译： 示例中的计算机可读存储介质具有存储在其上的计算机程序，并且表示一组指令，当在MR成像期间由计算机执行时，计算机执行以下操作：获取并行RF发射线圈阵列的每个发射线圈的B1场映射 ; 基于用于所述并行RF发射线圈阵列的多个发射线圈的至少一个有效B1场图，利用计算算法确定用于目标激励分布的激励脉冲方案; 并且为并联RF发射线圈阵列的多个发射线圈中的相应发射线圈产生至少一个SAR降低的RF脉冲序列。 并联RF发射线圈阵列能够具有任何并联RF发射线圈阵列几何形状。 每个有效的B1场映射反映了在发射线圈和至少另一个发射线圈之间存在的电感耦合效应。

公开(公告)号：US20240295620A1

公开(公告)日：2024-09-05

申请号：US18573518

申请日：2022-06-27

申请人： THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOIS

发明人： Xiaohong Joe Zhou ,  Kaibao Sun

IPC分类号： G01R33/483 ,  G01R33/48 ,  G01R33/561 ,  G01R33/563

CPC分类号： G01R33/4835 ,  G01R33/4806 ,  G01R33/4822 ,  G01R33/4836 ,  G01R33/5611 ,  G01R33/5616 ,  G01R33/56341

摘要： The present disclosure provides technologies that allow reduced field of view or fast imaging with reduced image distortion. The first technique capitalizes on the benefit of reduced field of view imaging for full field of view coverage. The second technique allows achieves high resolution 3D images in a focused region. These techniques are expected to have applications for cancer imaging, neuro imaging, and other biomedical imaging areas.

公开(公告)号：US20170296072A1

公开(公告)日：2017-10-19

申请号：US15099814

申请日：2016-04-15

申请人： Siemens Medical Solutions USA, Inc.

发明人： Agus Priatna

IPC分类号： A61B5/026 ,  G01R33/563 ,  A61B5/00 ,  G01R33/565 ,  G01R33/483

CPC分类号： A61B5/0263 ,  A61B5/004 ,  A61B5/4244 ,  A61B5/742 ,  A61B5/748 ,  A61B2576/02 ,  G01R33/4836 ,  G01R33/546 ,  G01R33/5612 ,  G01R33/56316 ,  G01R33/5635 ,  G01R33/5676

摘要： A computer-implemented method of visualizing blood flow through a patient using magnetic resonance imaging (MRI) includes receiving an image of the portal venous system of the patient's liver at a full field of view. A reduced field of view is defined which encompasses the portal venous system of the patient's liver and excludes extraneous anatomy in the full field of view. A navigator area is defined in the full field of view and outside of the reduced field of view. Transmit channels are used to selectively excite the reduced field of view and the navigator area throughout a cardiac cycle of the patient. Measurement data is acquired in response to the selective excitation. The acquired data is used to generate time-resolved 3D datasets. Additionally, a 3D visualization of blood flow though the portal venous system is generated based on the time-resolved 3D datasets.

公开(公告)号：US20160231409A1

公开(公告)日：2016-08-11

申请号：US14619788

申请日：2015-02-11

申请人： The Board of Trustees of the Leland Stanford Junior University

发明人： Valentina Taviani ,  Brian A. Hargreaves ,  Bruce L. Daniel ,  Shreyas S. Vasanawala ,  Suchandrima Banerjee

IPC分类号： G01R33/561

CPC分类号： G01R33/5611 ,  G01R33/4835 ,  G01R33/4836 ,  G01R33/5616

摘要： A method for magnetic resonance imaging is provided that includes using a magnetic resonance imaging system to excite a field of view (FOV) for a target being imaged, using an excitation plan to limit the excited FOV to a relatively narrow band of magnetization, exciting multiple bands of magnetization simultaneously, applying phase encoding along a shortest FOV dimension, acquiring a signal from said simultaneously excited bands of magnetization, and reconstructing and outputting a target image from the acquired signal.

摘要翻译： 提供了一种用于磁共振成像的方法，其包括使用磁共振成像系统来激发用于被成像的目标的视场（FOV），使用激发计划将激发的FOV限制到相对较窄的磁化带，激发多个 同时施加磁化带，沿着最短的FOV维度施加相位编码，从所述同时激励的磁化带获取信号，以及从所获取的信号重建和输出目标图像。

公开(公告)号：US20160143545A1

公开(公告)日：2016-05-26

申请号：US14904152

申请日：2014-07-08

申请人： HITACHI MEDICAL CORPORATION

发明人： Takashi NISHIHARA ,  Hiroyuki ITAGAKI

IPC分类号： A61B5/026 ,  A61B5/113

CPC分类号： A61B5/0263 ,  A61B5/055 ,  A61B5/113 ,  A61B5/4244 ,  G01R33/4836 ,  G01R33/5607 ,  G01R33/56509 ,  G01R33/5673

摘要： Provided is a technique in MRI to efficiently suppress downstream blood in a specific region in a blood vessel having a slow flow velocity, such as the portal vein. For this purpose, a plurality of Beam Sat pulses are applied so as to equally suppress signals of blood flowing into a desired imaging region from a desired blood vessel during the period from applying an IR pulse to starting main imaging. Downstream blood in a specific region in a blood vessel having a slow flow velocity, such as the portal vein, can be suppressed efficiently by determining application conditions of the plurality of Beam Sat pulses that achieve the above based on a flow velocity of blood in a desired blood vessel and T1 of the said blood.

摘要翻译： 提供了一种MRI中的技术，用于有效地抑制诸如门静脉的具有缓慢流速的血管中的特定区域中的下游血液。 为此，施加多个束Sat脉冲，以在从施加IR脉冲到开始主成像的时间段期间同样抑制从期望的血管流入期望的成像区域的血液的信号。 通过确定实现上述方式的多个束星形脉冲的施加条件，能够有效地抑制流速慢的血管的特定区域的下游血液，基于血液的流速 所需血管和所述血液的T1。

公开(公告)号：US09291691B2

公开(公告)日：2016-03-22

申请号：US13126922

申请日：2011-04-12

申请人： Alexis Amadon ,  Martijn Cloos

发明人： Alexis Amadon ,  Martijn Cloos

IPC分类号： G01V3/00 ,  G01R33/483 ,  G01R33/48 ,  G01R33/24 ,  G01N24/08 ,  G01R33/34 ,  G01R33/44 ,  G01R33/565 ,  G01R33/58

CPC分类号： G01R33/4836 ,  G01N24/08 ,  G01R33/246 ,  G01R33/34046 ,  G01R33/44 ,  G01R33/4818 ,  G01R33/4822 ,  G01R33/4833 ,  G01R33/5659 ,  G01R33/586

摘要： A method of exciting nuclear spins in a body, the method comprising the steps of: (a) immerging said body (PB) in a static magnetic field (B0) for aligning nuclear spins along a magnetization axis (z), said static magnetic field being substantially uniform over at least a volume of interest (VOI) of said body; (b) exposing said body, or at least said volume of interest, to a time-varying magnetic field gradient having components (Gx, Gy, Gz) directed along at least three non-coplanar directions (x, y, z) and to a transverse radio-frequency field (B1), whereby said time-varying magnetic field gradient defines a three-dimensional trajectory in k-space constituted by segments linking discrete points (kT1-kT9), and said transverse radio-frequency field deposits radio-frequency energy along at least part of said trajectory for flipping said nuclear spins by a same predetermined flip angle, independently from their position within said volume of interest. A method of performing magnetic resonance imaging comprising a step of exciting nuclear spins in a body to be imaged, characterized in that said step is performed by carrying out a method. A magnetic resonance imaging scanner for carrying out such a method.

摘要翻译： 一种激发身体中的核自旋的方法，所述方法包括以下步骤：（a）将所述体（PB）浸入静磁场（B0）中，用于沿着磁化轴（z）对准核自旋，所述静磁场 在所述身体的至少一个感兴趣体积（VOI）上基本均匀; （b）使所述身体或至少所述感兴趣的体积暴露于具有沿着至少三个非共面方向（x，y，z）指向的分量（Gx，Gy，Gz）的时变磁场梯度，并且 横向射频场（B1），其中所述时变磁场梯度定义由链接离散点（kT1-kT9）和所述横向射频场存储无线电场的段构成的k空间中的三维轨迹， 沿着所述轨迹的至少一部分的频率能量，用于将所述核自旋翻转相同的预定翻转角，独立于所述感兴趣体积内的位置。 一种执行磁共振成像的方法，包括激发要成像的身体中的核自旋的步骤，其特征在于，所述步骤通过执行方法进行。 一种用于执行这种方法的磁共振成像扫描仪。

公开(公告)号：US09223001B2

公开(公告)日：2015-12-29

申请号：US13505296

申请日：2010-10-26

申请人： Gabriele Marianne Beck

发明人： Gabriele Marianne Beck

IPC分类号： G01R33/565 ,  G01N24/08 ,  G01R33/567 ,  G01R33/46

CPC分类号： G01R33/56572 ,  G01N24/08 ,  G01R33/46 ,  G01R33/4836 ,  G01R33/4838 ,  G01R33/543 ,  G01R33/5676

摘要： The invention relates to a method of magnetic resonance (MR) imaging of at least a portion of a body (10) placed in a stationary and substantially homogeneous main magnetic field. The method comprises the following steps; —exciting nuclear magnetization selectively within a spatially restricted volume of interest (20) by subjecting the portion to an imaging sequence (IMG) comprising at least one RF pulse (α) and switched magnetic field gradients (GX/GY); —acquiring at least one MR imaging signal from the volume of interest (20); —exciting nuclear magnetization within a spatially restricted navigator volume (21) by subjecting said portion to a navigator sequence (NAV) comprising at least one RF pulse and switched magnetic field gradients, wherein the navigator volume (21) at least partially overlaps with the volume of interest (20); —acquiring at least one MR navigator signal from said navigator volume (21); —reconstructing a MR image from the acquired MR imaging signals. It is an object of the invention to enable MR imaging with reliable motion detection and high image quality. For this purpose, the invention proposes that the nuclear magnetization within the volume of interest (20) is transformed back into longitudinal magnetization prior to application of the navigator sequence (NAV) by subjecting said portion to an unlabeling sequence (UNLBL) comprising at least one RF pulse (−α).

摘要翻译： 本发明涉及一种放置在固定和基本均匀的主磁场中的体（10）的至少一部分的磁共振（MR）成像方法。 该方法包括以下步骤： 通过对该部分进行包括至少一个RF脉冲（α）和切换磁场梯度（GX / GY）的成像序列（IMG）的选择性地在空间限制的感兴趣体积（20）内激发核磁化; - 从感兴趣体积（20）获取至少一个MR成像信号; - 通过使所述部分经受包括至少一个RF脉冲和切换磁场梯度的导航序列（NAV）在空间限制的导航器体积（21）内激发核磁化，其中导航器体积（21）至少部分地与体积重叠 的兴趣（20）; - 从所述导航器体积（21）获取至少一个MR导航器信号; - 从所获取的MR成像信号重建MR图像。 本发明的一个目的是能够以可靠的运动检测和高图像质量实现MR成像。 为此目的，本发明提出，在施加导航序列（NAV）之前，将感兴趣体积（20）内的核磁化转变回纵向磁化强度，使得所述部分经受包含至少一个的非标记序列（UNLBL） RF脉冲（-α）。

公开(公告)号：US09097777B2

公开(公告)日：2015-08-04

申请号：US13443908

申请日：2012-04-11

申请人： Hans Weber ,  Maxim Zaitsev ,  Daniel Gallichan ,  Juergen Hennig

发明人： Hans Weber ,  Maxim Zaitsev ,  Daniel Gallichan ,  Juergen Hennig

IPC分类号： G01R33/483

CPC分类号： G01R33/4833 ,  G01R33/483 ,  G01R33/4835 ,  G01R33/4836

摘要： A method of MR imaging applies a magnetic field Bgrad1 having a spatially non-linear dependence to select a volume of at least one curved slice. The slice is described by its midsurface AM, a volume of the selected slice being made up of nν partial volumes in each of which gradients of at least one pair of remaining superimposed magnetic fields Bgradi (i>1) exhibit an angle dependence of 70° to 110° with respect to one another and with respect to the normal of the midsurface AM. At least one superimposed magnetic field of the respective pair exhibits a spatially non-linear dependence and combinations of these pairs are used for spatial encoding. In this way, curved surfaces can be mapped efficiently in high resolution and the method can be adapted to the slice shape.

摘要翻译： MR成像的方法应用具有空间非线性依赖性的磁场Bgrad1来选择至少一个弯曲切片的体积。 切片由其中心面AM描述，所选切片的体积由n＆ngr组成; 至少一对剩余叠加磁场Bgradi（i> 1）的梯度中的每一个的部分体积相对于彼此表现出70°至110°的角度依赖性，并且相对于中空面AM的法线呈现角度依赖性。 相应对的至少一个叠加的磁场表现出空间非线性相关性，并且这些对的组合用于空间编码。 以这种方式，可以高分辨率地有效地映射曲面，并且该方法可以适应于切片形状。

公开(公告)号：US09035652B2

公开(公告)日：2015-05-19

申请号：US13504590

申请日：2010-11-11

申请人： Takashi Nishihara ,  Hiroyuki Itagaki

发明人： Takashi Nishihara ,  Hiroyuki Itagaki

IPC分类号： G01R33/48 ,  A61B5/055 ,  A61B5/00 ,  G01R33/483

CPC分类号： G01R33/4828 ,  A61B5/055 ,  A61B5/4312 ,  A61B5/7257 ,  G01R33/4836

摘要： An MRI apparatus and a two-dimensional excitation adjustment method capable of performing appropriately two-dimensional excitation of a region, in which materials with different resonance frequencies are present, according to imaging conditions are provided. In order to do so, when performing the two-dimensional excitation of a two-dimensional excitation region of an object formed by a first material with a first resonance frequency and a second material with a second resonance frequency, an irradiation frequency of a high-frequency magnetic field for the two-dimensional excitation is set on the basis of the imaging conditions related to the two-dimensional excitation and the first and second resonance frequencies so that desired regions of the first and second materials are excited in a two-dimensional manner.

摘要翻译： 提供了能够根据成像条件对存在不同谐振频率的材料进行适当二维激励的MRI装置和二维激励调整方法。 为了这样做，当由具有第一共振频率的第一材料形成的物体的二维激发区域和具有第二共振频率的第二材料进行二维激发区域的二维激发时， 基于与二维激励和第一和第二共振频率相关的成像条件来设定用于二维激励的高频磁场，使得第一和第二材料的期望区域以二维方式被激发 。