JP2009018079A5 - - Google Patents
Download PDFInfo
- Publication number
- JP2009018079A5 JP2009018079A5 JP2007184096A JP2007184096A JP2009018079A5 JP 2009018079 A5 JP2009018079 A5 JP 2009018079A5 JP 2007184096 A JP2007184096 A JP 2007184096A JP 2007184096 A JP2007184096 A JP 2007184096A JP 2009018079 A5 JP2009018079 A5 JP 2009018079A5
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- imaging apparatus
- magnetic resonance
- resonance imaging
- phase
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Claims (5)
前記検査対象に照射する高周波磁場パルスを発生する高周波磁場発生手段と、
空間選択励起または周波数選択励起するように前記傾斜磁場発生手段および前記高周波磁場発生手段の駆動を制御する制御手段と、を備えた磁気共鳴イメージング装置であって、
前記振動傾斜磁場による残留磁場および渦電流による、前記励起する核スピンの位相と前記高周波磁場パルスの位相とのずれを、前記高周波磁場パルスの位相を補正することにより調整する補正手段を備えること
を特徴とする磁気共鳴イメージング装置。 Gradient magnetic field generating means for generating gradient magnetic fields in three orthogonal directions to be applied to an inspection object placed in a static magnetic field;
A high-frequency magnetic field generating means for generating a high-frequency magnetic field pulse for irradiating the inspection object;
A magnetic resonance imaging apparatus comprising: control means for controlling driving of the gradient magnetic field generating means and the high-frequency magnetic field generating means so as to perform spatial selective excitation or frequency selective excitation ,
And a correction means for adjusting a difference between a phase of the nuclear spin to be excited and a phase of the high frequency magnetic field pulse due to a residual magnetic field and an eddy current due to the oscillating gradient magnetic field by correcting the phase of the high frequency magnetic field pulse A magnetic resonance imaging apparatus.
前記検査対象から発生される磁気共鳴信号に基づいて前記検査対象に係る画像を再構成する演算手段をさらに備え、
前記補正手段は、前記再構成された画像の励起プロファイルから前記ずれを算出し、前記高周波磁場パルスの位相を補正すること
を特徴とする磁気共鳴イメージング装置。 The magnetic resonance imaging apparatus according to claim 1,
A calculation means for reconstructing an image related to the inspection object based on a magnetic resonance signal generated from the inspection object;
The magnetic resonance imaging apparatus characterized in that the correction means calculates the deviation from the excitation profile of the reconstructed image and corrects the phase of the high-frequency magnetic field pulse.
前記補正手段は、前記制御手段の制御に従って取得した前記磁気共鳴信号の位相情報を用いて前記ずれを算出し、前記高周波磁場パルスの位相を補正すること
を特徴とする磁気共鳴イメージング装置。 The magnetic resonance imaging apparatus according to claim 1,
The magnetic resonance imaging apparatus characterized in that the correction means calculates the shift using phase information of the magnetic resonance signal acquired according to the control of the control means, and corrects the phase of the high-frequency magnetic field pulse.
前記補正手段は、前記制御手段の制御に従って取得した特定種のプロトンのスペクトル信号を用いて前記ずれを算出し、前記高周波磁場パルスの位相を補正すること
を特徴とする磁気共鳴イメージング装置。 The magnetic resonance imaging apparatus according to claim 1,
The magnetic resonance imaging apparatus characterized in that the correction means calculates the deviation using a spectrum signal of a specific type of proton obtained according to the control of the control means, and corrects the phase of the high-frequency magnetic field pulse.
前記補正手段は、前記残留磁場によるずれと前記渦電流によるずれとを、それぞれ独立に算出し、前記位相の補正を行うこと
を特徴とする磁気共鳴イメージング装置。 The magnetic resonance imaging apparatus according to any one of claims 1 to 4,
The magnetic resonance imaging apparatus characterized in that the correction means calculates the shift due to the residual magnetic field and the shift due to the eddy current independently to correct the phase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007184096A JP5285244B2 (en) | 2007-07-13 | 2007-07-13 | Magnetic resonance imaging system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007184096A JP5285244B2 (en) | 2007-07-13 | 2007-07-13 | Magnetic resonance imaging system |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2009018079A JP2009018079A (en) | 2009-01-29 |
| JP2009018079A5 true JP2009018079A5 (en) | 2010-08-19 |
| JP5285244B2 JP5285244B2 (en) | 2013-09-11 |
Family
ID=40358228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2007184096A Active JP5285244B2 (en) | 2007-07-13 | 2007-07-13 | Magnetic resonance imaging system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP5285244B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5366484B2 (en) * | 2007-09-28 | 2013-12-11 | 株式会社東芝 | Magnetic resonance imaging apparatus and analysis method of fat suppression effect in the magnetic resonance imaging apparatus |
| WO2011144958A1 (en) * | 2010-05-21 | 2011-11-24 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Method and apparatus for correcting bl - inhomogeneity in slice - selective mri using composite rf pulses |
| US9921284B2 (en) | 2012-09-20 | 2018-03-20 | Hitachi, Ltd. | Magnetic resonance imaging apparatus and magnetic resonance imaging method, configured to adjust multi-dimensional selective excitation pulse |
| JP6548204B2 (en) * | 2014-04-23 | 2019-07-24 | ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー | Magnetic resonance device |
| JP2023009819A (en) * | 2021-07-08 | 2023-01-20 | 東京都公立大学法人 | Imaging device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4965521A (en) * | 1989-08-11 | 1990-10-23 | Spectroscopy Imaging Systems | Method and apparatus for compensating eddy current effects in a magnetic resonance device having pulsed magnetic field gradients |
| JPH11235324A (en) * | 1998-02-24 | 1999-08-31 | Hitachi Medical Corp | Magnetic resonance imaging device |
| JP2000157509A (en) * | 1998-11-23 | 2000-06-13 | General Electric Co <Ge> | Calibration method for mri system, mri system and reset gradient generation method |
| JP3971726B2 (en) * | 2003-09-16 | 2007-09-05 | ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー | Magnetic resonance imaging device |
| WO2006046450A1 (en) * | 2004-10-29 | 2006-05-04 | Hitachi Medical Corporation | Magnetic resonance imaging device |
-
2007
- 2007-07-13 JP JP2007184096A patent/JP5285244B2/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5424578B2 (en) | Magnetic sensing method, atomic magnetic sensor, and magnetic resonance imaging apparatus | |
| JP2013215575A5 (en) | ||
| JP4717608B2 (en) | Magnetic resonance imaging system | |
| WO2011155461A1 (en) | Magnetic resonance imaging device and transmitting sensitivity distribution calculation method | |
| RU2015137718A (en) | ACTIVE COMPENSATION FOR COMPONENTS OF FIELD DISTORTION IN THE SYSTEM FOR CREATING MAGNETIC RESONANCE IMAGES WITH HENRY | |
| JP2009018079A5 (en) | ||
| JP2016517328A5 (en) | ||
| JP4864969B2 (en) | Magnetic resonance imaging system | |
| RU2017130041A (en) | PARALLEL MULTISRESA MR-VISUALIZATION WITH SUPPRESSION OF LATERAL ARTS FACTS | |
| JP2011521760A5 (en) | ||
| US10470685B2 (en) | Method and apparatus for capturing magnetic resonance image | |
| JPWO2012124375A1 (en) | Magnetic resonance imaging system | |
| JP6078465B2 (en) | Magnetic resonance imaging apparatus and high-frequency magnetic field determination method | |
| JP2004261591A5 (en) | ||
| JP2014151207A5 (en) | ||
| JP2012161354A (en) | Magnetic resonance imaging device and nonlinear distortion correction method | |
| JP2010227247A (en) | Instrument and method for measurement | |
| JP2017522969A (en) | Gradient amplifier system for driving a gradient coil and method for configuring the same | |
| JP2014508947A5 (en) | ||
| JP2014233635A5 (en) | ||
| WO2008126895A1 (en) | Superconducting magnet apparatus, magnetic resonance imaging device, and magnetic field inhomogeneity compensation method | |
| JP2009018079A (en) | Magnetic resonance imaging apparatus | |
| JP2008073316A5 (en) | ||
| JP2013121437A5 (en) | ||
| JP2011229632A5 (en) |