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Multi-slice mr imaging method and apparatus

A magnetic resonance imaging and multi-slice technology, which is applied in the fields of magnetic resonance measurement, nuclear magnetic resonance analysis, measurement devices, etc., can solve problems such as the inability to use multi-slice technology

Inactive Publication Date: 2005-11-02
GE YOKOGAWA MEDICAL SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, since the method disclosed in Japanese Patent Application No. 2-45448 (Kokai Publication No. 60-151548) uses non-selective inversion pulses, it cannot actually be used for "multi-slice technology"

Method used

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  • Multi-slice mr imaging method and apparatus
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  • Multi-slice mr imaging method and apparatus

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no. 1 example -

[0075] Fig. 1 is a block diagram showing a magnetic resonance imaging apparatus constructed according to a first embodiment of the present invention.

[0076] In the magnetic resonance imaging apparatus 100, the magnet assembly 1 has a cavity portion (inner cavity) through which an object is inserted, and around the cavity portion, a static magnetic field for applying a static magnetic field of constant intensity to the object is provided. Coil 1p, a gradient magnetic field coil 1g (comprising x-, y-, and z-axis coils) for generating a gradient magnetic field, a transmitting coil 1t for applying MT pulses or excitation pulses to objects, and a transmitter coil 1t for detecting from A receiving coil 1r for the NMR signal emitted by said object. The static magnetic field coil 1p is connected to a static magnetic field power supply 2 , the gradient magnetic field coil 1g is connected to a gradient magnetic field driving circuit 3 , the transmitting coil 1t is connected to a radio...

no. 2 example -

[0104] Figure 6 To represent a schematic diagram of a pulse sequence in which forced recovery pulses are applied in the fast spin echo technique, the number of magnetic resonance data sets=3.

[0105] (1) Applying a selective excitation pulse 90°x, which rotates the longitudinal magnetization of an object slice for magnetic resonance data acquisition by 90° around the x-axis to generate transverse magnetization.

[0106] (2) Applying a selective inversion pulse 180°y, which rotates the transverse magnetization direction of the object slice for magnetic resonance data acquisition by 180° around the y-axis, and receiving NMR signals. Repeat this step three times (where "-o" means "odd" and "-e" means "even").

[0107] (3) Applying a selective refocusing pulse 180° y-e, which rotates the transverse magnetization direction of the object slice for magnetic resonance data acquisition by 180° around the y-axis.

[0108] (4) As a forced recovery pulse sequence FR, a rephasing gradi...

no. 3 example -

[0113] Figure 7 To represent a schematic diagram of a pulse sequence in which forced recovery pulses are applied in the fast spin echo technique, the number of magnetic resonance data sets=2.

[0114] (1) Applying a selective excitation pulse 90°x, which rotates the longitudinal magnetization of an object slice for magnetic resonance data acquisition by 90° around the x-axis to generate transverse magnetization.

[0115] (2) Applying a selective inversion pulse 180°y, which rotates the transverse magnetization direction of the object slice for magnetic resonance data acquisition by 180° around the y-axis, and receiving NMR signals. Repeat this step twice (where "-o" means "odd" and "-e" means "even").

[0116] (3) Applying a selective refocusing pulse 180° y-o, which rotates the transverse magnetization direction of the object slice for magnetic resonance data acquisition by 180° around the y-axis.

[0117] (4) As a forced recovery pulse sequence FR, a rephasing gradient R i...

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Abstract

In order to enable the application of a forcible recovery pulse to the multi-slice technique, when selective inversion pulses satisfy the CPMG condition or the CP condition and ETL (Echo Train Length) is even, a dummy selective inversion pulse is applied at the end of each pulse sequence of the fast spin echo technique for each slice, then a dummy read axis gradient is applied without acquiring MR data, then a refocusing pulse selective of only the current slice is applied, and subsequently a forcible recovery pulse sequence FR selective of only the current slice is applied.

Description

[0001] This application is a divisional application of an invention patent application with an application date of October 30, 1998, an application number of 98121433.9, and an invention title of "Multi-slice Magnetic Resonance Imaging Method and Device". technical field [0002] The invention relates to a multi-slice MR (magnetic resonance) imaging method and device according to which forced recovery pulses can be used in the "multi-slice technique". Background technique [0003] In Japanese Patent Application No.2-45448 (1990) (Japanese Patent Application Laid-Open No. 60-151548 (1985)), a method is disclosed which includes the steps of repeating a pulse within a repetition time TR sequence, while changing the phase encoding gradient so as to fill the k-space, this pulse sequence applies a first 90° pulse (selective excitation pulse) and n 180° pulses (non-selective inversion pulse) to obtain n sets of magnetic resonance in parallel data, their relaxation times T 2 are di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/48A61B5/055G01N24/08G01R33/20G01R33/54G01R33/561
CPCG01R33/5618G01R33/4835
Inventor 宫本昭荣押尾晃一小杉进
Owner GE YOKOGAWA MEDICAL SYST LTD