公开(公告)号：US5057776A

公开(公告)日：1991-10-15

申请号：US447800

申请日：1989-12-08

Applicant: Albert Macovski

Inventor： Albert Macovski

IPC: G01R33/385 ,  G01R33/48

CPC classification number: G01R33/445 ,  G01R33/385

Abstract: A pulsed strong magnetic field is applied to an object creating a magnetic moment distribution. Following the pulse a set of spatially orthogonal gradient fields pointed normal to the magnetic moments are used to cause the magnetic moments to precess around the axis of the gradient fields, producing time-varying magnetic fields indicative of the spatial distribution of the magnetic moments. These are then detected, processed and used to make magnetic resonance images of the object.

Abstract translation: 脉冲强磁场被施加到产生磁矩分布的物体上。 在脉冲之后，使用垂直于磁矩的一组空间正交的梯度场使磁矩围绕梯度场的轴发生，产生指示磁矩的空间分布的时变磁场。 然后检测，处理并使用它们来制造物体的磁共振图像。

公开(公告)号：US4777956A

公开(公告)日：1988-10-18

申请号：US893794

申请日：1986-08-06

Applicant: Albert Macovski

Inventor： Albert Macovski

IPC: G01R33/563 ,  G01R33/565 ,  A61B5/05

CPC classification number: G01R33/563 ,  G01R33/56563

Abstract: A two-dimensional projection image of the NMR activity within a volume is obtained. The signals due to static material are not excited and do not appear in the projection image. The signals due to moving blood in vessels produce an isolated image of the vessels with the superimposed structure removed. Excitation systems are used which excite only moving material and return static material to equilibrium. A 180.degree. excitation provides immunity to inhomogeneity.

Abstract translation: 获得体积内的NMR活性的二维投影图像。 由静态材料引起的信号不会激发，也不会出现在投影图像中。 由于血管中的血液移动引起的信号产生血管的隔离图像，并且重叠的结构被去除。 使用激发系统，其仅激发移动材料并将静态材料返回到平衡。 180°激发可提供对不均匀性的免疫。

公开(公告)号：US4686695A

公开(公告)日：1987-08-11

申请号：US207351

申请日：1980-11-17

Applicant: Albert Macovski

Inventor： Albert Macovski

IPC: A61B6/03 ,  G01N23/04 ,  G06T11/00 ,  H04N5/32 ,  H05G1/60 ,  G03B41/16

CPC classification number: A61B6/032 ,  A61B6/4035 ,  A61B6/405 ,  A61B6/4241 ,  A61B6/4291 ,  A61B6/482 ,  G01N23/043 ,  G06T11/005 ,  H04N5/3205 ,  H05G1/60 ,  G06T2211/408 ,  G06T2211/412

Abstract: An x-ray beam is scanned through a sequence of subsections of a volume. At each position the x-ray transmission is measured at two energies. The resultant transmission signals are processed to produce a signal representing the projected amount of a specific material in the volume. The two energies are chosen so that the mass attenuation coefficients of bone and soft tissue are comparable to each other.

Abstract translation: X射线束通过卷的子序列进行扫描。 在每个位置，以两种能量测量X射线透射。 处理所得到的传输信号以产生表示体积中特定材料的投影量的信号。 选择两种能量，使得骨骼和软组织的质量衰减系数彼此相当。

公开(公告)号：US4579121A

公开(公告)日：1986-04-01

申请号：US467661

申请日：1983-02-18

Applicant: Albert Macovski

Inventor： Albert Macovski

IPC: A61B10/00 ,  A61B5/04 ,  A61B5/055 ,  G01R33/48 ,  G01R33/50 ,  G01R33/54 ,  G01R33/561

CPC classification number: G01R33/561 ,  G01R33/50 ,  G01R33/54

Abstract: A cross-sectional image of the NMR activity in the body is formed by taking a sequence of projections, each having a different transverse gradient structure. Following each excitation the spins in the cross section are driven back to equilibrium. For imaging relaxation times, the sequence of projection signals are processed so as to represent an acquisition at a specific desired time.

公开(公告)号：US4577152A

公开(公告)日：1986-03-18

申请号：US483827

申请日：1983-04-11

Applicant: Albert Macovski

Inventor： Albert Macovski

IPC: G01R33/48 ,  G01R33/50 ,  G01R33/561 ,  G01R33/20

CPC classification number: G01R33/445 ,  G01R33/50 ,  G01R33/561

Abstract: Two-dimensional projection measurements are formed of the NMR activity within a volume. Measurements are made using different intensities of the main magnetic field, using the different dependencies of relaxation times on magnetic field. The projection measurements are combined to obtain projection images of specific materials within the volume. Projection images are obtained of specific regions within the volume by insuring that the unwanted regions remain insensitized. For improved SNR, projection measurements are repeated to obtain spin-echo signals. The measurements of relaxation times are interleaved so that the data acquisition can occur rapidly.

Abstract translation: 二维投影测量由体积内的NMR活性形成。 使用不同强度的主磁场进行测量，使用松弛时间对磁场的不同依赖性。 组合投影测量以获得体积内特定材料的投影图像。 通过确保不想要的区域保持不敏感，从而获得体积内特定区域的投影图像。 为了改善SNR，重复投影测量以获得自旋回波信号。 松弛时间的测量被交织，使得数据采集可以快速发生。

公开(公告)号：US4551680A

公开(公告)日：1985-11-05

申请号：US487294

申请日：1983-04-21

Applicant: Albert Macovski

Inventor： Albert Macovski

IPC: G01R33/563

CPC classification number: G01R33/563

Abstract: Two-dimensional projection measurements are formed of the NMR activity of a selected region of a volume. These represent different properties of the materials within the volume including density and relaxation times. The measurements of the different properties are processed to produce projection images of specific materials within the volume. Projection images are also obtained of moving materials only to provide isolated vessel images.

Abstract translation: 二维投影测量由体积的选定区域的NMR活性形成。 这些代表材料在体积内的不同性质，包括密度和弛豫时间。 对不同性质的测量进行处理，以产生体积内特定材料的投影图像。 也可以通过移动材料获得投影图像，仅提供隔离的血管图像。

公开(公告)号：US4400721A

公开(公告)日：1983-08-23

申请号：US282400

申请日：1981-07-13

Applicant: Albert Macovski

Inventor： Albert Macovski

IPC: H04N9/77 ,  H04N9/535

CPC classification number: H04N9/77

Abstract: The response of color television signals are improved by adding a high frequency luminance component which is proportional to the color-difference signal so as to provide color signals with correct transitions. The ratio of the derivative of the color difference signal to the derivative of the low frequency portion of the luminance signal is used to weight the amplitude of the luminance component.

Abstract translation: 通过添加与色差信号成比例的高频亮度分量来提高彩色电视信号的响应，以提供具有正确转换的彩色信号。 使用色差信号的导数与亮度信号的低频部分的导数的比率来加权亮度分量的幅度。

公开(公告)号：US4310847A

公开(公告)日：1982-01-12

申请号：US930984

申请日：1978-08-04

Applicant: Hugh F. Frohbach ,  Albert Macovski ,  Norman A. Peppers ,  Thomas L. Siwecki ,  Louis F. Schaefer

Inventor： Hugh F. Frohbach ,  Albert Macovski ,  Norman A. Peppers ,  Thomas L. Siwecki ,  Louis F. Schaefer

IPC: H04N9/11 ,  H04N9/04

CPC classification number: H04N9/11

Abstract: A color image is recorded on film at the television field rate. A portion of the film is illuminated, corresponding to a line in the color image, and decomposed into its component colors. The decomposed light from the line is imaged onto two or more line scanning photosensitive arrays which provide scanned signals. These scanned signals are decoded and used to provide the standard color television signals.

Abstract translation: 彩色图像以电视场速率记录在电影上。 对应于彩色图像中的一条线，该部分胶片被照亮，并被分解为其分量颜色。 来自线的分解光被成像到提供扫描信号的两个或更多行扫描光敏阵列上。 这些扫描信号被解码并用于提供标准彩色电视信号。

公开(公告)号：US4029963A

公开(公告)日：1977-06-14

申请号：US710359

申请日：1976-07-30

Applicant: Robert E. Alvarez ,  Albert Macovski

Inventor： Robert E. Alvarez ,  Albert Macovski

IPC: G01N23/04 ,  A61B6/00 ,  A61B6/03 ,  G01N23/02 ,  G01N23/08 ,  H04N5/32 ,  H05G1/26 ,  A61B6/02 ,  H05G1/30

CPC classification number: G01N23/083 ,  A61B6/032 ,  A61B6/4035 ,  A61B6/405 ,  A61B6/4241 ,  A61B6/482 ,  H05G1/26 ,  Y10S378/901

Abstract: Projection measurements are made of the transmitted x-ray beam in low and high energy regions. These are combined in a non-linear processor to produce atomic-number-dependent and density-dependent projection information. This information is used to provide cross-sectional images which are free of spectral-shift artifacts and completely define the specific material properties.

Abstract translation: 在低能量和高能量区域中发射的X射线束进行投影测量。 它们被组合在非线性处理器中以产生与原子数相关的和密度相关的投影信息。 该信息用于提供没有光谱漂移伪像并完全限定特定材料特性的横截面图像。

公开(公告)号：US3965358A

公开(公告)日：1976-06-22

申请号：US530397

申请日：1974-12-06

Applicant: Albert Macovski

Inventor： Albert Macovski

IPC: G01N23/08 ,  G01T1/20

CPC classification number: G01N23/083 ,  A61B6/4241

Abstract: The transmitted polychromatic x-ray beam in a cross-sectional x-ray imaging system is applied to pulse-height discriminators for energy spectral analysis. Various regions of the energy spectrum are separately counted in order to provide an accurate reconstruction of the cross-sectional density which is independent of the different materials in the path of the transmitted x-ray beam. This same energy spectral information is used to create separate images representing the different materials in the cross section.

Abstract translation: 在横截面X射线成像系统中将透射的多色X射线束应用于能量谱分析的脉冲高度鉴别器。 能量谱的各个区域被分开计数，以提供与透射的X射线束的路径中的不同材料无关的横截面密度的精确重建。 使用相同的能量谱信息来创建表示横截面中不同材料的分离图像。