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Magnetic resonance imaging apparatus

A technology of magnetic resonance imaging and gradient magnetic field, which is applied in measuring devices, measuring magnetic variables, medical science, etc., can solve problems such as image quality degradation, and achieve the effect of suppressing image quality degradation

Active Publication Date: 2013-07-17
TOSHIBA MEDICAL SYST CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is well known that, in imaging based on the FSE method, the echo peak or phase of the spin echo signal and the stimulated echo signal shifts due to the eddy current magnetic field, resulting in image quality degradation.

Method used

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  • Magnetic resonance imaging apparatus
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Experimental program
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no. 1 Embodiment approach ）

[0020] figure 1 It is a diagram showing the configuration of the MRI apparatus according to the first embodiment. Such as figure 1 As shown, the MRI apparatus 100 includes: a static magnetic field magnet 1, a gradient magnetic field coil (coil) 2, a gradient magnetic field power supply 3, a bed 4, a bed control unit 5, a transmitting RF coil 6, a transmitting unit 7, a receiving RF coil 8, a receiving Part 9, sequence control part 10 and computer system (system) 20.

[0021] The static field magnet 1 is a hollow cylindrical magnet, and generates a uniform static magnetic field in the internal space. As the static field magnet 1, for example, a permanent magnet, a superconducting magnet, or the like is used.

[0022] The gradient coil 2 is a hollow cylindrical coil and is arranged inside the static field magnet 1 . This gradient magnetic field coil 2 is formed by combining three coils corresponding to the mutually orthogonal X, Y, and Z axes. These three coils are individua...

no. 2 Embodiment approach ）

[0074] In addition, in the above-mentioned embodiment, an example was described in which the slice selection in each refocusing pulse was deselected in the pulse sequence of the FSE method, but the embodiment is not limited thereto. For example, the techniques described in the above embodiments can be similarly implemented when performing slice selection in each refocusing pulse in the pulse sequence of the FSE method. Hereinafter, an example at this time will be described as a second embodiment. In addition, the MRI apparatus according to the second embodiment is basically the same as figure 1 The devices shown in and 3 are the same, but the pulse sequence generated by the generating unit 26b is different.

[0075] Figure 10 It is a figure which shows an example of the pulse sequence of the FSE method concerning 2nd Embodiment. here, Figure 10 The example shown is with figure 2 The pulse sequence when using the VFA method is the same, but the point for slice selection...

no. 3 Embodiment approach ）

[0083] In addition, in the above-mentioned embodiment, an example of imaging by the FSE method has been described, but the embodiment is not limited thereto. For example, the techniques described in the above embodiments can be similarly implemented when performing imaging by the spin echo (Spin Echo: SE) method. Hereinafter, an example at this time will be described as a third embodiment. In addition, the MRI apparatus according to the third embodiment is basically the same as figure 1 The devices shown in and 3 are the same, but the pulse sequence generated by the generating unit 26b is different.

[0084] Figure 11 It is a diagram showing an example of a pulse sequence of the SE method according to the third embodiment. Such as Figure 11 As shown, in the SE method, the refocusing pulse A1 is applied after TE (Echo Time) / 2 has elapsed since the excitation pulse A0 (90° pulse) was applied. Accordingly, after TE has elapsed since the application of the excitation pulse ...

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Abstract

Provided is a magnetic resonance imaging apparatus that can suppress image quality deterioration caused by eddy component with a short time constant included in an eddy field. A magnetic resonance imaging apparatus according to an embodiment includes a controller and an image reconstruction unit. The controller executes a pulse sequence having spare time during the time after transient of a gradient magnetic field for dephasing, applied in a readout direction after a radio frequency (RF) pulse for excitation is applied, until the first RF pulse for refocusing is applied in the case where imaging based on a fast spin echo method is performed. The image reconstruction unit reconstructs an image from magnetic resonance data collected by executing the pulse sequence.

Description

[0001] This application claims the priority of the Japanese patent application No. 2012-005519 filed on January 13, 2012 and the Japanese patent application No. 2012-269515 filed on December 10, 2012, and cites all of the above Japanese patent applications in this application content. technical field [0002] Embodiments relate to a magnetic resonance imaging (MRI) apparatus. Background technique [0003] Conventionally, as an imaging method related to a magnetic resonance imaging apparatus, there is a fast spin echo (Fast Spin Echo: FSE) method. In this FSE method, a plurality of RF pulses for refocusing (refocus) are sequentially applied after applying an RF (Radio Frequency) pulse (pulse) for excitation to the subject, thereby collecting what is called an echo train (echo train). ) The imaging method of multiple echo (echo) signals. It is well known that, in imaging based on this FSE method, the echo peak or phase of the spin echo signal and the stimulated echo signal i...

Claims

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Application Information

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IPC IPC(8): A61B5/055
CPCG01R33/5617G01R33/56518G01R33/543
Inventor 梅田匡朗
Owner TOSHIBA MEDICAL SYST CORP
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