公开(公告)号：EP0109238B1

公开(公告)日：1989-01-18

申请号：EP83306723.4

申请日：1983-11-04

Applicant: PICKER INTERNATIONAL LIMITED

Inventor： Young, Ian Robert ,  Bailes, David Robert

IPC: G01N24/08

CPC classification number: G01R33/482

公开(公告)号：EP0167350A3

公开(公告)日：1987-05-27

申请号：EP85304558

申请日：1985-06-26

Applicant: PICKER INTERNATIONAL LIMITED

Inventor： Bailes, David Robert

IPC: G01N24/08

CPC classification number: G01R33/56509

Abstract: A method, and an apparatus for performing the method, are described, for imaging a region of a body using NMR in which part of the region is moving with a motion such that its displacement with respect to time is a nonmonotonic function during the time period over which NMR data signals are collected. The data signals are collected in an order dependent on the motion such that motion artefacts are reduced.

公开(公告)号：EP0129356A3

公开(公告)日：1985-12-04

申请号：EP84303689

申请日：1984-06-01

Applicant: PICKER INTERNATIONAL LIMITED

Inventor： Bailes, David Robert

IPC: G01N24/08

CPC classification number: G01R33/5659

Abstract: A NMR imaging method and apparatus effective to cause spins of a chosen nucleus within a body to rotate through an angle of 180° wherein degradation of the image due to non-uniformity of the r.f. coil (9) is reduced. The method includes applying an even number of r.f. magnetic field pulses (B 2 , B.) at the Larmor frequency for a chosen nucleus in the body and each intended to rotate the spins of these nuclei through 180°, half of the number of pulses having a phase difference of 180° with respect to the other half of the number of pulses. NMR signals from the body are measured after each pulse, and the signals are averaged.

Abstract translation: 一种NMR成像方法和装置，其有效地使身体内所选择的细胞核的旋转旋转180°，其中由于r.f.的不均匀性导致的图像劣化。 线圈（9）减少。 该方法包括应用偶数r.f. 在拉莫尔频率处的磁场脉冲（B2，B4）用于体内所选择的核，并且每个旨在使这些核的自旋旋转180°，相位差为180°的脉冲数的一半相对于 其他一半的脉冲数。 在每个脉冲之后测量来自身体的NMR信号，并且对信号进行平均。

公开(公告)号：EP0109238A2

公开(公告)日：1984-05-23

申请号：EP83306723.4

申请日：1983-11-04

Applicant: PICKER INTERNATIONAL LIMITED

Inventor： Young, Ian Robert ,  Bailes, David Robert

IPC: G01N24/08

CPC classification number: G01R33/482

Abstract: A method of nuclear magnetic resonance imaging of a body in which the spins of a chosen nucleus in a selected slice (43) of the body are rotated through an angle appreciably greater than 90° by applying, in sequence, two substantially identical r.f. pulses (B 1 (90°), B 2 (90°)) accompanied by a magnetic field having a gradient (G 1 z, G 2 z) in a direction orthogonal to the plane of the slice (43). Each r.f. pulse is at the Larmor frequency for the chosen nuclei in the slice (43), and is effective to rotate the spins by not greater than 90° and the r.f. pulses together are sufficient to rotate the spins through the angle. The gradients of the magnetic fields are in opposite directions.

公开(公告)号：EP0167350B1

公开(公告)日：1990-09-05

申请号：EP85304558.1

申请日：1985-06-26

Applicant: PICKER INTERNATIONAL LIMITED

Inventor： Bailes, David Robert

IPC: G01N24/08

CPC classification number: G01R33/56509

公开(公告)号：EP0167350A2

公开(公告)日：1986-01-08

申请号：EP85304558.1

申请日：1985-06-26

Applicant: PICKER INTERNATIONAL LIMITED

Inventor： Bailes, David Robert

IPC: G01N24/08

CPC classification number: G01R33/56509

Abstract: A method, and an apparatus for performing the method, are described, for imaging a region of a body using NMR in which part of the region is moving with a motion such that its displacement with respect to time is a nonmonotonic function during the time period over which NMR data signals are collected. The data signals are collected in an order dependent on the motion such that motion artefacts are reduced.

公开(公告)号：EP0109238A3

公开(公告)日：1985-05-29

申请号：EP83306723

申请日：1983-11-04

Applicant: PICKER INTERNATIONAL LIMITED

Inventor： Young, Ian Robert ,  Bailes, David Robert

IPC: G01N24/08

CPC classification number: G01R33/482

Abstract: A method of nuclear magnetic resonance imaging of a body in which the spins of a chosen nucleus in a selected slice (43) of the body are rotated through an angle appreciably greater than 90° by applying, in sequence, two substantially identical r.f. pulses (B 1 (90°), B 2 (90°)) accompanied by a magnetic field having a gradient (G 1 z, G 2 z) in a direction orthogonal to the plane of the slice (43). Each r.f. pulse is at the Larmor frequency for the chosen nuclei in the slice (43), and is effective to rotate the spins by not greater than 90° and the r.f. pulses together are sufficient to rotate the spins through the angle. The gradients of the magnetic fields are in opposite directions.

Abstract translation: 一种身体的核磁共振成像方法，其中，通过依次应用两个基本相同的r.f.，将身体的选定切片（43）中的选定核的自旋旋转通过明显大于90°的角度。 伴随着在与切片（43）的平面正交的方向上具有梯度（G 1z，G 2z）的磁场的脉冲（B 1（90°），B 2（90°））。 每个r.f. 脉冲对于切片（43）中的选定原子核处于拉莫尔频率，并且有效地使自旋旋转不超过90°，并且r.f. 脉冲一起足以使旋转旋转角度。 磁场的梯度是相反的方向。

公开(公告)号：EP0129356A2

公开(公告)日：1984-12-27

申请号：EP84303689.8

申请日：1984-06-01

Applicant: PICKER INTERNATIONAL LIMITED

Inventor： Bailes, David Robert

IPC: G01N24/08

CPC classification number: G01R33/5659

Abstract: A NMR imaging method and apparatus effective to cause spins of a chosen nucleus within a body to rotate through an angle of 180° wherein degradation of the image due to non-uniformity of the r.f. coil (9) is reduced. The method includes applying an even number of r.f. magnetic field pulses (B 2 , B.) at the Larmor frequency for a chosen nucleus in the body and each intended to rotate the spins of these nuclei through 180°, half of the number of pulses having a phase difference of 180° with respect to the other half of the number of pulses. NMR signals from the body are measured after each pulse, and the signals are averaged.

Abstract translation: 一种NMR成像方法和装置，其有效地使身体内所选择的细胞核的旋转旋转180°，其中由于r.f.的不均匀性导致的图像劣化。 线圈（9）减少。 该方法包括应用偶数r.f. 在拉莫尔频率处的磁场脉冲（B2，B4）用于体内所选择的核，并且各自旨在使这些核的自旋旋转180°，相位差为180°的脉冲数的一半相对于 其他一半的脉冲数。 在每个脉冲之后测量来自身体的NMR信号，并且对信号进行平均。