WO2006040866A1 - 磁気共鳴撮影装置及び磁気共鳴撮影方法 - Google Patents
磁気共鳴撮影装置及び磁気共鳴撮影方法 Download PDFInfo
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- WO2006040866A1 WO2006040866A1 PCT/JP2005/013282 JP2005013282W WO2006040866A1 WO 2006040866 A1 WO2006040866 A1 WO 2006040866A1 JP 2005013282 W JP2005013282 W JP 2005013282W WO 2006040866 A1 WO2006040866 A1 WO 2006040866A1
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- magnetic resonance
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- resonance signal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
- G01R33/54—Signal processing systems, e.g. using pulse sequences ; Generation or control of pulse sequences; Operator console
- G01R33/56—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution
- G01R33/565—Correction of image distortions, e.g. due to magnetic field inhomogeneities
- G01R33/56563—Correction of image distortions, e.g. due to magnetic field inhomogeneities caused by a distortion of the main magnetic field B0, e.g. temporal variation of the magnitude or spatial inhomogeneity of B0
Definitions
- the present invention relates to a magnetic resonance imaging technique, and more particularly, to a magnetic resonance imaging apparatus and a magnetic resonance imaging method suitable for measuring a magnetic resonance signal including information related to chemical shift.
- a magnetic resonance imaging apparatus excites nuclear magnetization of hydrogen nuclei contained in a subject by irradiating a subject placed in a static magnetic field with a high-frequency magnetic field having a specific frequency (magnetic resonance phenomenon). It is possible to acquire physical and chemical information by detecting a magnetic resonance signal generated from the subject.
- magnetic resonance imaging hereinafter abbreviated as MRI
- MRI magnetic resonance imaging
- MRS Magnetic Resonance Spectroscopy
- MRSI 3 ⁇ 4 Common Magnetic Resonance Spectroscopic Imaging
- the concentration of metabolites contained in a subject is often very low. Therefore, when measuring MRS or MRSI, if measurement is performed without suppressing the high-concentration water signal, The weak signal of the metabolite is buried in the base of the huge signal peak generated from water, and it becomes very difficult to separate and extract the metabolite signal. For this reason, in conventional MRS or MRSI measurements, preprocessing to suppress the water signal is performed immediately before normal excitation and detection. [0005] In the processing for suppressing the water signal, first, in order to excite only the nuclear magnetization contained in the water molecule, the transmission frequency is adjusted to the water peak position and the excitation frequency band is about the water peak width.
- Non-Patent Document 1 Journal of Magnetic Resonance, pp. 70, 488-492, published in 1986
- Non-Patent Document 2 Magnetic Resonance in Imaging, 30th, pp. 641-645, 1993
- the magnetic resonance signal obtained after repeating the measurement of the magnetic resonance signal under the same measurement conditions on the premise that the static magnetic field strength is constant over time. was integrated.
- first before water suppression spectrum measurement with repeated measurement for signal integration, at least once without water signal suppression, spectrum measurement is performed and the resonance frequency of water is measured.
- the static magnetic field strength (resonance frequency) is constant over time during the MRS or MRSI measurement performed after the water resonance frequency measurement (i.e. After repeating the signal measurement (after assuming that the peak position and signal phase of each metabolite on the outer layer do not change), signal integration is performed. I was going.
- the static magnetic field strength (resonance frequency) may change during MRS or MRSI measurement.
- the resonance frequency even if the measurement is repeated for integration, the resonance frequency
- the peak position and signal phase (explained below) of each metabolite fluctuate with the shift, resulting in a problem that the SNR improvement effect by integration cannot be obtained sufficiently.
- the peak position is shifted, the peak width of the integrated spectrum is widened, and the spectral resolution is also lowered.
- phase detection In a normal magnetic resonance imaging apparatus to which the present invention is applied, complex detection of magnetic resonance signals is performed by a technique called phase detection. Specifically, in the phase detection method, when a high frequency signal for irradiation is used as a reference wave, and when the difference between the detected magnetic resonance signal and the reference wave signal is extracted, a higher frequency component (correct) ) And a frequency component lower than the irradiation high-frequency magnetic field (a wave having a negative sign). The sign of this frequency component is reflected as the phase, and the component in phase with the high frequency magnetic field for irradiation and the component whose phase is shifted by 90 degrees are detected simultaneously.
- the measured magnetic resonance signal is always composed of a real part (hereinafter abbreviated as Re) and an imaginary part (hereinafter abbreviated as Im), and a complex Fourier transform.
- Re real part
- Im imaginary part
- the signal phase ⁇ (Pw) at the peak position (Pw) in the latter spectrum is expressed by (Equation 1) below.
- phase detection is used in a normal magnetic resonance imaging apparatus.
- SNR is improved as compared with normal detection (non-phase detection such as diode detection).
- the mechanism is as follows. Street. Since the irradiation high-frequency magnetic field is used for exciting the nuclear magnetization, the phase of the signal component of the magnetic resonance signal excited by this irradiation high-frequency magnetic field completely matches the phase of the irradiation high-frequency magnetic field. ing. On the other hand, the phase of the noise component superimposed on the magnetic resonance signal has no correlation with the phase of the high frequency magnetic field for irradiation. Therefore, the phase of the signal component included in the real part signal and the imaginary part signal that have been phase-detected has a correlation, and the phase of the superimposed noise component has no correlation. It becomes.
- An object of the present invention is to reduce deterioration of a magnetic resonance spectrum caused by a change in a static magnetic field.
- An object of the present invention is to provide a magnetic resonance imaging apparatus and a magnetic resonance imaging method.
- the magnetic resonance imaging apparatus and magnetic resonance imaging method of the present invention during water suppression spectrum measurement (main measurement) accompanied by repeated measurement for signal integration, it is performed periodically.
- Non-water suppression spectrum measurement preliminary measurement
- the water resonance frequency water peak position
- the phase value of the water signal peak are periodically detected from the obtained non-water suppression spectrum.
- Periodic preliminary measurement makes it possible to detect temporal fluctuations in the static magnetic field strength (resonance frequency)), and during water suppression measurement (main measurement) performed after the preliminary measurement. Then, the reception start phase value at the time of detecting the magnetic resonance signal is set to the value obtained by calculating the phase value force at the water signal peak position detected in the preliminary measurement.
- the integration process is performed after the data is shifted by the value calculated from the water signal peak position detected in the preliminary measurement.
- the setting of the phase value and the process of shifting the water signal peak position may be controlled to perform at least one of them.
- periodic non-water suppression spectrum measurement is performed during water suppression spectrum measurement (main measurement) accompanied by repeated measurement for signal integration. (Preliminary measurement), and detect and record the phase change of the obtained non-water suppression time-series signal. (This periodic preliminary measurement detects the time variation of the static magnetic field strength (resonance frequency). Phase correction processing for changing the phase change of the recorded non-water suppression time-series signal to a predetermined phase characteristic at the time of water suppression spectrum measurement (main measurement) performed after the preliminary measurement. Then, it is applied to the measured water suppression time series signal.
- the invention's effect is performed during water suppression spectrum measurement (main measurement) accompanied by repeated measurement for signal integration. (Preliminary measurement), and detect and record the phase change of the obtained non-water suppression time-series signal. (This periodic preliminary measurement detects the time variation of the static magnetic field strength (resonance frequency). Phase correction processing for changing the phase change of the recorded non-water suppression time-series signal to a predetermined phase characteristic at the time of water suppression spectrum measurement (main measurement) performed after
- the magnetic resonance imaging apparatus of the present invention it is possible to provide a good magnetic resonance spectrum with improved SNR due to the integration effect even when resonance frequency fluctuations accompanying static magnetic field changes occur. It becomes.
- FIG. 1 is an external view of a magnetic resonance imaging apparatus to which the present invention is applied.
- Fig. 1 (a) shows a magnetic resonance imaging device using a tunnel-type magnet that generates a static magnetic field with a solenoid coil.
- 1 (b) is a hamburger-type magnetic resonance imaging apparatus in which magnets are separated into upper and lower parts to enhance the feeling of opening.
- FIG. 1 (c) the sense of openness is enhanced by shortening the depth of the force magnet, which is the same tunnel-type magnetic resonance imaging apparatus as in FIG.
- FIG. 2 is a diagram showing a configuration example of a magnetic resonance imaging apparatus to which the present invention is applied.
- the subject 1 is placed in a space to which a static magnetic field generated by the static magnetic field generating magnet 2 and three orthogonal gradient magnetic fields generated by the gradient magnetic field generating coil 3 are applied. There may be a shim coil 11 that can adjust the uniformity of the static magnetic field by changing the current flowing through each coil.
- the subject 1 is irradiated with a high-frequency magnetic field generated by the probe 4 to cause a magnetic resonance phenomenon, and the magnetic resonance signal generated from the subject 1 is detected by the probe 4.
- the high frequency magnetic field to be irradiated is generated by the transmitter 8, and the detected magnetic resonance signal is sent to the computer 5 through the receiver 9.
- the computer 5 performs various arithmetic processes on the magnetic resonance signal, generates spectral information and image information, and displays the information on the display 6 and records it in the storage device 13 (necessary). Accordingly, the measurement conditions are also recorded in the storage device 13).
- the power supply unit 12 for driving the shim coil 11, the power supply unit 7 for driving the gradient magnetic field generating coil 3, the transmitter 8 and the receiver 9 are controlled by the sequence control device 10.
- FIG. 2 shows an example in which the probe 4 is used for both transmission and reception.
- the transmission probe and the reception probe may be provided separately.
- FIG. 3 is a diagram showing an example of an MRS measurement pulse sequence (MRS pulse sequence) used in the embodiment of the present invention.
- MRS pulse sequence MRS measurement pulse sequence
- the first gradient magnetic field (gradient magnetic field in the X-axis direction) Gsl for selection of the first slice (plane perpendicular to the X-axis) is called the 90 ° pulse.
- the nuclear magnetization in the first slice can be brought into an excited state.
- TE is the echo time
- TR is the repetition time.
- the second gradient magnetic field gradient magnetic field in the Y-axis direction
- the second slice plane perpendicular to the Y-axis
- the second high-frequency magnetic field called 180 ° pulse
- the nuclear magnetization contained in the third slice can be reversed 180 ° again.
- the magnetic resonance echo signal Sigl can be generated with the time after the RF3 irradiation power TE / 4 as the echo time.
- Gsl ′ applied immediately after application of Gsl is a gradient magnetic field for rephasing (phase return) with respect to Gsl.
- Gdl and Gdl 'and Gd2 and Gs2' applied before and after application of RF2 do not disturb the phase of the nuclear magnetization excited by the irradiation of RF1 (that is, the phase change between Gdl and Gdl ' The phase change is canceled by Gd2 and Gs2 '.)
- Gd3 and Gd3 'and Gd4 and Gd4' applied before and after RF3 application do not disturb the phase of the nuclear magnetization excited by the irradiation of RF1 (that is, the phase change between Gd3 and Gd3 ' It is canceled and the phase change is canceled by Gd4 and Gd4 '.)
- FIG. 4 shows a prepulse sequence for suppressing a water signal used in the embodiment of the present invention.
- the transmission frequency Ft is set to the resonance frequency Fw of water, and the excitation frequency band ⁇ High frequency magnetic field (high frequency magnetic field for water excitation) RFwl with Ft set to about water peak width ⁇ Fw (selective excitation of water nuclear magnetization).
- the gradient magnetic field Gdwl is applied in order to separate the phase of the nuclear magnetization of water in the excited state and make the vector sum of the nuclear magnetization of water zero. Saturation).
- FIG. 4 is an example of a sequence that repeats three times).
- the high-frequency magnetic field RFwl often uses a Gaussian waveform having a narrow-band excitation frequency characteristic.
- the example shown in Fig. 4 is an example in which one of the Gx, Gy, and Gz gradient magnetic fields is applied as the gradient magnetic field for the phase, but all three Gx, Gy, and Gz gradient magnetic fields are applied. They may be applied simultaneously, or any two axes may be applied simultaneously. Then, while the pseudo-saturation state of water magnetization continues, the signal of a weak metabolite can be measured by performing the sequence of FIG. 3 (following the sequence of FIG. 4).
- the flip angle of the water excitation high-frequency magnetic field RFw is often set to around 90 °.
- various combinations and numerical values are applied as the number of applied axes and the applied intensity. Is used.
- the signals of metabolites that can be detected from within a living body are often very weak. Therefore, the measurement is repeated several times for the purpose of improving the SNR of the obtained spectrum.
- the process of adding the received signals is performed (integration process).
- FIG. 5 is a flowchart showing an example of a conventional MRS measurement procedure on the assumption that the static magnetic field strength is constant in time (resonance frequency is constant). The outline of the shooting procedure is described below.
- St mark 05-03 The water signal peak position ⁇ W is detected from the magnetic resonance spectrum SW ( ⁇ ), and the water resonance frequency FW is calculated and recorded (usually, the point having the highest signal intensity is the water signal). Peak position is determined as ⁇ W).
- Step05_04 Based on the FW value as a reference, the transmission frequency of the high-frequency magnetic field to be irradiated in the process of suppressing the water signal, the transmission frequency of the high-frequency magnetic field to be irradiated to selectively excite the imaging button cell VI, generated from the imaging button cell VI Set each value of the reception frequency when detecting the magnetic resonance signal.
- Step05-05 Performs the main measurement sequence (measurement in which the water signal suppression pulse sequence shown in Fig. 4 and the MRS sequence shown in Fig. 3 are continuously performed) to obtain the Hi Hi substance signal
- Measure the magnetic resonance signal RMl (t) generated from VI (RMl (t) is M points (t 1, 2, 3, ..., M, for example, 4096 points) arranged in time series. Complex data).
- FIG. 6 shows a photographing procedure in the first embodiment of the present invention.
- periodic non-water suppression spectrum measurement is performed during water suppression spectrum measurement (main measurement) with repeated measurement for signal integration, and the obtained non-water suppression is obtained.
- the water resonance frequency (water peak position) and the phase value of the water signal peak are periodically detected from the vector (by performing this preliminary preliminary measurement, the time fluctuation of the static magnetic field strength (resonance frequency) can be detected. Is possible).
- the reception start phase value at the time of magnetic resonance signal detection is set to a value obtained by calculating the phase value force of the water signal peak position detected by the preliminary measurement.
- the data is shifted by the value calculated from the water signal peak position detected in the preliminary measurement, and then the integration process is performed.
- St mark 06-03 The water signal peak position ⁇ Wi is detected from the magnetic resonance spectrum SWi ( ⁇ ), and the water resonance frequency FWi is calculated and recorded (usually, the point having the highest signal intensity is Signal peak position S Wi).
- St mark 06-05 deviation angle between the signal phase value ⁇ Wi at the peak position ⁇ Wi and the predetermined phase value ⁇ WO
- St mark 06-06 Based on the value of the water resonance frequency FWi, the transmission frequency of the high-frequency magnetic field irradiated by the water signal suppression processing, the transmission frequency of the high-frequency magnetic field irradiated to selectively excite the imaging botasel VI, Set each value of the reception frequency when detecting the magnetic resonance signal generated from the imaging button cell VI.
- Step 06-07 The deviation angle ⁇ Wi is set as the reception start phase value.
- St mark 06-08 Performs the main measurement sequence (measurement in which the water signal suppression pulse sequence shown in Fig. 4 and the MRS sequence shown in Fig. 3 are continuously performed) to acquire the substitute substance signal.
- L for example, 10 times
- N for example, 300
- FIG. 7 shows a photographing procedure in the second embodiment of the present invention.
- periodic non-water suppression spectrum measurement is performed during water suppression spectrum measurement (main measurement) with repeated measurement for signal integration, and the obtained non-water suppression is obtained. Detect and record phase changes in time series signals.
- this periodic preliminary measurement it is possible to detect temporal fluctuations in the static magnetic field strength (resonance frequency).
- a phase correction process for changing the phase change of the recorded non-water suppression time series signal to a predetermined phase characteristic is performed. Apply to time-series signals.
- Step 07-04 The water signal peak position ⁇ Wi is detected from the magnetic resonance spectrum SWi ( ⁇ ), Calculate and record the water resonance frequency FWi (usually, the point with the highest signal intensity is the water signal peak position S Wi).
- St mark 07-05 The transmission frequency of the high-frequency magnetic field that is irradiated in the water signal suppression process, the transmission frequency of the high-frequency magnetic field that is irradiated to selectively excite the imaging button cell VI, based on the value of the water resonance frequency FWi, Set each value of the reception frequency when detecting the magnetic resonance signal generated from the imaging button cell VI.
- St mark 07-06 Performs the main measurement sequence (measurement in which the water signal suppression pulse sequence shown in Fig. 4 and the MRS sequence shown in Fig. 3 are continuously performed) to obtain a substitute substance signal.
- Step 07-07 A phase correction process using the phase correction function ⁇ Wi (t) is performed on the magnetic resonance signal RMj (t) to calculate a corrected magnetic resonance signal RNj (t).
- Step07-09 The above steps 07_06 to St-mark 07-08 are repeated N times (for example, 300 times)
- phase characteristic of the magnetic resonance signal at the time of non-water suppression is used as a reference. It is known that phase correction processing has an effect of reducing magnetic resonance signal distortion caused by gradient magnetic field eddy current (eddy current correction effect).
- the second embodiment has an effect of periodically measuring (updating) the reference phase characteristic used in the phase correction, so that it is stable even when a resonance frequency fluctuation occurs due to a static magnetic field change. The eddy current effect can be obtained.
- FIG. 1 is an external view showing a magnetic resonance imaging apparatus to which the present invention is applied.
- FIG. 2 is a diagram showing a configuration example of a magnetic resonance imaging apparatus to which the present invention is applied.
- FIG. 3 is a diagram showing an example of an MRS pulse sequence used in an embodiment of the present invention.
- FIG. 4 is a diagram showing an example of a pulse sequence for suppressing a water signal used in an embodiment of the present invention.
- FIG. 5 is a flowchart showing a conventional MRS measurement procedure.
- FIG. 6 is a flowchart showing the procedure of MRS measurement in the first embodiment of the present invention (Embodiment 1).
- FIG. 7 is a flowchart showing an MRS measurement procedure in the second embodiment of the present invention (Embodiment 2).
Abstract
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US11/630,766 US7355405B2 (en) | 2004-10-13 | 2005-07-20 | Magnetic resonance imaging system and magnetic resonance imaging method |
JP2006540832A JP4564015B2 (ja) | 2004-10-13 | 2005-07-20 | 磁気共鳴撮影装置及び磁気共鳴撮影方法 |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008004324A1 (fr) * | 2006-07-07 | 2008-01-10 | Hitachi Medical Corporation | Dispositif d'imagerie par résonance magnétique |
WO2010137516A1 (ja) * | 2009-05-27 | 2010-12-02 | 株式会社 日立メディコ | 磁気共鳴撮影装置 |
CN109799471A (zh) * | 2019-01-11 | 2019-05-24 | 中国科学院苏州生物医学工程技术研究所 | 一种磁共振波谱成像模拟方法及系统、存储介质、电子设备 |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JP4579830B2 (ja) * | 2003-06-30 | 2010-11-10 | 株式会社日立メディコ | 磁気共鳴撮影装置 |
US8248070B1 (en) * | 2011-03-22 | 2012-08-21 | Kabushiki Kaisha Toshiba | MRI using prep scan sequence producing phase-offset NMR signals from different NMR species |
GB2507585B (en) * | 2012-11-06 | 2015-04-22 | Siemens Plc | MRI magnet for radiation and particle therapy |
JP6518194B2 (ja) * | 2012-12-26 | 2019-05-22 | コーニンクレッカ フィリップス エヌ ヴェKoninklijke Philips N.V. | アクセス可能な磁気共鳴撮像スキャナシステム及びソレノイド構造体 |
KR101593380B1 (ko) | 2015-12-29 | 2016-02-11 | 이화여자대학교 산학협력단 | 영상 분석 장치, 및 장치를 이용하여 영상을 분석하는 방법 |
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US5111819A (en) * | 1988-11-25 | 1992-05-12 | General Electric | Nmr imaging of metabolites using a multiple quantum excitation sequence |
US6023634A (en) * | 1995-03-20 | 2000-02-08 | Kabushiki Kaisha Toshiba | MR imaging using mutual interaction between different kinds of pools of nuclear spins |
US5818230A (en) * | 1996-07-02 | 1998-10-06 | The Trustees Of Columbia University In The City Of New York | Nuclear magnetic resonance pulse sequence for acquiring a multiple-quantum filtered image |
US5903149A (en) * | 1997-04-11 | 1999-05-11 | The Trustees Of The University Of Pennsylvania | Three-dimensional localized proton NMR spectroscopy using a hybrid of one-dimensional hadamard with two-dimensional chemical shift imaging |
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- 2005-07-20 JP JP2006540832A patent/JP4564015B2/ja not_active Expired - Fee Related
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008004324A1 (fr) * | 2006-07-07 | 2008-01-10 | Hitachi Medical Corporation | Dispositif d'imagerie par résonance magnétique |
JP4808254B2 (ja) * | 2006-07-07 | 2011-11-02 | 株式会社日立メディコ | 磁気共鳴撮影装置 |
US8400148B2 (en) | 2006-07-07 | 2013-03-19 | Hitachi Medical Corporation | Magnetic resonance imaging apparatus |
WO2010137516A1 (ja) * | 2009-05-27 | 2010-12-02 | 株式会社 日立メディコ | 磁気共鳴撮影装置 |
JP5165791B2 (ja) * | 2009-05-27 | 2013-03-21 | 株式会社日立メディコ | 磁気共鳴撮影装置 |
CN109799471A (zh) * | 2019-01-11 | 2019-05-24 | 中国科学院苏州生物医学工程技术研究所 | 一种磁共振波谱成像模拟方法及系统、存储介质、电子设备 |
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JPWO2006040866A1 (ja) | 2008-05-15 |
US7355405B2 (en) | 2008-04-08 |
JP4564015B2 (ja) | 2010-10-20 |
US20070241754A1 (en) | 2007-10-18 |
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