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Magnetic resonance imaging apparatus

A technology of magnetic resonance imaging and equipment, applied in magnetic resonance measurement, measurement using nuclear magnetic resonance image system, measurement of magnetic variables, etc., can solve problems such as difficulty in improving image quality, limitation of imaging area, poor versatility, etc.

Active Publication Date: 2007-08-29
GE MEDICAL SYST GLOBAL TECH CO LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, since multiple images are acquired at multiple times, and MRA images are generated using FBI methods using different values ​​between images, body motion can be noticeable if the subject moves its body during imaging Artifacts of , and due to the T2 attenuation in the phase encoding direction, the image may become blurred, which may cause problems that make it difficult to improve the image quality
[0008] In other imaging methods, in addition to the issues mentioned above, the imaging area is limited, which leads to less versatility

Method used

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Embodiment approach 1

[0036] Embodiment Mode 1 regarding the present invention is described below.

[0037] (Hardware Configuration)

[0038] FIG. 1 is a configuration diagram of a magnetic resonance imaging apparatus 1 in Embodiment 1 of the present invention.

[0039] As shown in FIG. 1 , the magnetic resonance system 1 in this embodiment has a scanning unit 2 and an operating control unit 3 .

[0040] Next, the scanning unit 2 will be explained.

[0041] As shown in FIG. 1 , the scanning unit 2 has a static magnet unit 12 , a gradient coil unit 13 , an RF coil unit 14 , a bracket 15 , an RF drive unit 22 , a gradient drive unit 23 and a data collection unit 24 . The scanning unit 2 transmits RF pulses to the subject SU to excite the spins of the subject SU in the imaging space B, form a static magnetic field in the imaging space B, and perform an imaging sequence IS, wherein the acquisition of The SU transmits RF pulses) transmits gradient pulses to generate magnetic resonance signals in the ...

Embodiment approach

[0074] Here, as shown in FIG. 3 , from the first time point t11 ​​to the second time point t12 , the scanning unit 2 transmits the first RF pulse RF1 , RF1 is a rectangular pulse. In this embodiment, as shown in FIG. 4(A1) and FIG. 4(B1), the magnetization vector points to the magnetostatic direction z in the object SU, and the scanning unit 2 points to the spins S1 and S2 emits a first RF pulse RF1. As shown in Fig. 4(A2) and Fig. 4(B2), the polarization vectors of these spins S1 and S2 are flipped to be along the yz plane.

[0075]More particularly, as shown in FIG. 4(A1) and FIG. 4(B1), the first RF pulse RF1 whose flip angle is 45° and whose phase is in the x direction is transmitted to the spins S1 and S2, the spins S1 and S2 The longitudinal magnetization of is M0, the transverse magnetization is zero, and as shown in Fig. 4(A2) and Fig. 4(B2), the magnetization vectors attributable to the spins S1 and S2 tilt from 0° direction to 45° on the yz plane ° direction.

[0...

Embodiment approach 2

[0109] Next, Embodiment 2 of the present invention will be described.

[0110] This embodiment differs from the most recent embodiment 1 ( FIG. 3 ) in the preparation sequence performed when imaging the subject SU. This mode of implementation is based on a preparation sequence known as the CPMG (Carr-Purcell-Meiboon-Gukk) method, and is similar to Embodiment 1 except in this respect. For this reason, descriptions of the same parts will be omitted.

[0111] FIG. 6 is a pulse sequence diagram of the preparation sequence PS in Embodiment 2 of the present invention.

[0112]In Fig. 6, RF represents the time axis of transmitting RF pulses; Gvenc represents the time axis of transmitting velocity encoding pulses; and Gkill represents the time axis of transmitting suppression pulses, for each case the horizontal axis represents the time t and the vertical axis represents the pulse strength. Here, Gvenc and Gkill are time axes for transmitting gradient pulses, and each time axis is ...

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Abstract

Versatility and the quality of images are to be improved. As preparation pulses, a first RF pulse to flip along the yz plane spins oriented in a magnetostatic field direction in a subject; a velocity encoding gradient pulse which, in spins flipped by that first RF pulse, mutually shifts the phase of spins in a static state and the phase of spins in a moving state; and a second RF pulse to flip along the yz plane spins whose phase has been shifted by the velocity encoding gradient pulse are successively transmitted. After that, a killer pulse is transmitted to extinguish the transverse magnetizations of the spins flipped by the second RF pulse.

Description

technical field [0001] The present invention relates to a magnetic resonance imaging device, and a magnetic resonance imaging device for transmitting RF pulses to a subject in a magnetostatic space in which an imaging sequence is performed, wherein a gradient pulse produced by transmitting a gradient pulse to the subject is obtained Magnetic resonance signals are used as imaging data from which an image of the object to which the RF signal was transmitted is generated based on the imaging data obtained by performing an imaging sequence. Background technique [0002] Magnetic resonance imaging (MRI) equipment is used in many different fields, including medical and industrial uses. [0003] According to a nuclear magnetic resonance (NMR) phenomenon, by irradiating a subject with electromagnetic waves, a magnetic resonance imaging apparatus excites spins of protons in a subject in a magnetostatic space, and performs scanning to obtain magnetic resonance (MR) signals generated b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/055G01R33/48
CPCG01R33/56308A61B5/055G01R33/5635G01R33/4838
Inventor 三好光晴
Owner GE MEDICAL SYST GLOBAL TECH CO LLC
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