JP2005319074A5 - - Google Patents
Download PDFInfo
- Publication number
- JP2005319074A5 JP2005319074A5 JP2004139571A JP2004139571A JP2005319074A5 JP 2005319074 A5 JP2005319074 A5 JP 2005319074A5 JP 2004139571 A JP2004139571 A JP 2004139571A JP 2004139571 A JP2004139571 A JP 2004139571A JP 2005319074 A5 JP2005319074 A5 JP 2005319074A5
- Authority
- JP
- Japan
- Prior art keywords
- echo signal
- magnetic field
- offset
- gradient magnetic
- resonance imaging
- 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 (3)
極性の異なる前記傾斜磁場を印加して、前記被検体から第一のエコー信号と第二のエコー信号とを取得し、前記第一のエコー信号と前記第二のエコー信号とを用いて前記傾斜磁場のオフセットを算出し、前記算出されたオフセットの補正を前記傾斜磁場発生手段に設定してオフセット補正を行うオフセット補正手段と、を備えた磁気共鳴イメージング装置において、
前記オフセット補正手段は、前記第一のエコー信号のフーリエ変換後の位相と前記第二のエコー信号のフーリエ変換後の位相との位相差に基づいて、前記オフセットを算出することを特徴とする磁気共鳴イメージング装置。 A gradient magnetic field generating means for generating a gradient magnetic field to be applied to the subject;
Applying the gradient magnetic fields of different polarities to obtain a first echo signal and a second echo signal from the subject, and using the first echo signal and the second echo signal, the gradient calculating the offset of the magnetic field, the magnetic resonance imaging apparatus provided with an offset correction means for performing offset correction is set to the gradient magnetic field generating means for correction of the calculated offset,
The offset correction means calculates the offset based on a phase difference between a phase after Fourier transform of the first echo signal and a phase after Fourier transform of the second echo signal. Resonance imaging device.
前記傾斜磁場発生手段は、第一の方向と第二の方向にそれぞれ前記傾斜磁場を発生し、
前記オフセット補正手段は、前記第一の方向の傾斜磁場のオフセット補正を行った状態で、前記第二の方向の傾斜磁場のオフセット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 claim 1.
The gradient magnetic field generating means generates the gradient magnetic field in a first direction and a second direction,
The magnetic resonance imaging apparatus, wherein the offset correction unit performs offset correction of the gradient magnetic field in the second direction in a state in which the offset correction of the gradient magnetic field in the first direction is performed .
前記オフセット補正手段は、前記第一のエコー信号のフーリエ変換の値と前記第二のエコー信号のフーリエ変換後の値とが共に所定の閾値以上となる範囲の位相を用いて前記オフセットを算出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 or 2,
The offset correction means calculates the offset using a phase in a range where both the Fourier transform value of the first echo signal and the Fourier transform value of the second echo signal are equal to or greater than a predetermined threshold value. A magnetic resonance imaging apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004139571A JP4336243B2 (en) | 2004-05-10 | 2004-05-10 | Magnetic resonance imaging system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004139571A JP4336243B2 (en) | 2004-05-10 | 2004-05-10 | Magnetic resonance imaging system |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2005319074A JP2005319074A (en) | 2005-11-17 |
| JP2005319074A5 true JP2005319074A5 (en) | 2007-06-14 |
| JP4336243B2 JP4336243B2 (en) | 2009-09-30 |
Family
ID=35466795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2004139571A Active JP4336243B2 (en) | 2004-05-10 | 2004-05-10 | Magnetic resonance imaging system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4336243B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4443079B2 (en) | 2001-09-13 | 2010-03-31 | 株式会社日立メディコ | Magnetic resonance imaging apparatus and RF receiving coil for magnetic resonance imaging apparatus |
| US7250762B2 (en) * | 2005-07-07 | 2007-07-31 | General Electric Company | Method and system of MR imaging with reduced FSE cusp artifacts |
| JP5835989B2 (en) | 2010-08-11 | 2015-12-24 | 株式会社東芝 | Magnetic resonance imaging apparatus and magnetic resonance imaging method |
| WO2012124375A1 (en) * | 2011-03-16 | 2012-09-20 | 株式会社 日立製作所 | Magnetic resonance imaging apparatus |
| JP5873280B2 (en) * | 2011-09-28 | 2016-03-01 | 株式会社日立メディコ | Magnetic resonance imaging apparatus and phase unwrapping method |
| WO2014112235A1 (en) * | 2013-01-16 | 2014-07-24 | 株式会社日立製作所 | Magnetic resonance imaging device and timing misalignment detection method thereof |
| JP6113522B2 (en) * | 2013-02-19 | 2017-04-12 | 東芝メディカルシステムズ株式会社 | Magnetic resonance imaging apparatus and image processing apparatus |
| JP6283134B2 (en) * | 2017-03-07 | 2018-02-21 | キヤノンメディカルシステムズ株式会社 | Magnetic resonance imaging apparatus and image processing apparatus |
-
2004
- 2004-05-10 JP JP2004139571A patent/JP4336243B2/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2017526512A5 (en) | ||
| JP2017533811A5 (en) | ||
| JP2017513606A5 (en) | ||
| JP2018519909A5 (en) | ||
| JP2003111746A5 (en) | ||
| JP2008136871A5 (en) | ||
| JP2014511742A5 (en) | ||
| WO2009087601A3 (en) | Method and apparatus to estimate location and orientation of objects during magnetic resonance imaging | |
| WO2009072619A1 (en) | Magnetic resonance imaging device and magnetic resonance imaging method | |
| EP1408341A3 (en) | MR angiography with a phase encoding direction set parallel to the target flow direction | |
| EP3333585A3 (en) | A 3d magnetic resonance imaging sequence with magnetization preparation and controlled aliasing | |
| WO2008123044A1 (en) | Internal organ fat measuring device | |
| WO2006120584A3 (en) | Magnetic resonance imaging with short echo times | |
| JP2005319074A5 (en) | ||
| JP2000166892A5 (en) | ||
| JP2003116815A5 (en) | ||
| WO2009042168A3 (en) | Magnetic resonance contrast using fictitious field relaxation | |
| WO2014197419A8 (en) | A MULTI-ECHO LENGTH AND OFFSET VARIED SATURATION (Me-LOVARS) METHOD FOR CHEMICAL EXCHANGE SATURATION TRANSFER (CEST) MR IMAGING | |
| JP2008295925A5 (en) | ||
| JP2004057226A5 (en) | ||
| JP2004024669A5 (en) | ||
| EP3168636A3 (en) | Gradient echo mri using velocity-selective excitation | |
| JP2014508947A5 (en) | ||
| JP2006026076A5 (en) | ||
| JP2009018079A5 (en) |