JP5047537B2 - 複数の駆動装置を利用する磁気共鳴エラストグラフィ - Google Patents
複数の駆動装置を利用する磁気共鳴エラストグラフィ Download PDFInfo
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- JP5047537B2 JP5047537B2 JP2006128457A JP2006128457A JP5047537B2 JP 5047537 B2 JP5047537 B2 JP 5047537B2 JP 2006128457 A JP2006128457 A JP 2006128457A JP 2006128457 A JP2006128457 A JP 2006128457A JP 5047537 B2 JP5047537 B2 JP 5047537B2
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- 238000012045 magnetic resonance elastography Methods 0.000 title description 2
- 238000000034 method Methods 0.000 claims description 21
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 claims description 17
- 238000002595 magnetic resonance imaging Methods 0.000 claims description 12
- 230000033001 locomotion Effects 0.000 claims description 10
- 210000001519 tissue Anatomy 0.000 description 21
- 230000008569 process Effects 0.000 description 8
- 230000010287 polarization Effects 0.000 description 7
- 238000003384 imaging method Methods 0.000 description 5
- 210000000056 organ Anatomy 0.000 description 5
- 230000004044 response Effects 0.000 description 5
- 206010028980 Neoplasm Diseases 0.000 description 4
- 238000002559 palpation Methods 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002091 elastography Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 210000002307 prostate Anatomy 0.000 description 2
- 238000002560 therapeutic procedure Methods 0.000 description 2
- 208000026310 Breast neoplasm Diseases 0.000 description 1
- 206010019695 Hepatic neoplasm Diseases 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 210000000481 breast Anatomy 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002059 diagnostic imaging Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 210000004185 liver Anatomy 0.000 description 1
- 208000014018 liver neoplasm Diseases 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 238000009206 nuclear medicine Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 208000023958 prostate neoplasm Diseases 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000002603 single-photon emission computed tomography Methods 0.000 description 1
- 238000000264 spin echo pulse sequence Methods 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- 210000001835 viscera Anatomy 0.000 description 1
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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
- G01R33/563—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution of moving material, e.g. flow contrast angiography
- G01R33/56358—Elastography
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0048—Detecting, measuring or recording by applying mechanical forces or stimuli
- A61B5/0051—Detecting, measuring or recording by applying mechanical forces or stimuli by applying vibrations
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/48—Diagnostic techniques
- A61B8/485—Diagnostic techniques involving measuring strain or elastic properties
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Engineering & Computer Science (AREA)
- General Health & Medical Sciences (AREA)
- Medical Informatics (AREA)
- Public Health (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Pathology (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- Biophysics (AREA)
- Radiology & Medical Imaging (AREA)
- Veterinary Medicine (AREA)
- High Energy & Nuclear Physics (AREA)
- Vascular Medicine (AREA)
- Signal Processing (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Description
周波数 100ヘルツ
振幅 10ボルト
相対位相 0度
変換器130b
周波数 100ヘルツ
振幅 15ボルト
相対位相 180度
Claims (4)
- 磁気共鳴画像形成(MRI)システムで磁気共鳴エラストグラム(MRE)を作成する方法であって、
a)画像形成される対象物の上に複数の変換器を配置するステップ、
b)予備走査の間にそれぞれの変換器を別々に作動させるステップ、
c)それぞれの変換器が作動されている間にMREパルスシーケンスを利用して画像データを取得するステップ、
d)ステップc)において取得された画像データを利用してそれぞれの変換器について画像を再構成するステップ、
e)再構成された画像から引き出された情報を利用してそれぞれの変換器を駆動するために最適な設定値を決定するステップ、および
f)最適な設定値を利用して複数の変換器が作動されている間にMRE画像を取得するステップ
を備え、
前記のステップe)において再構成された画像が、それぞれの変換器によって作成された対象物におけるスピンの動きを表示する歪み画像であり、また、ステップe)が、
e)i)画像を作成するためにそれぞれの変換器について取得されたデータの複素フーリエ変換を実行するステップ、および
e)ii)ステップe)i)において作成されたそれぞれの画像から、それぞれの画素での位相を演算することによって歪み画像を作成するステップ
を含み、
複数の歪み画像がそれぞれの変換器について再構成され、かつ、ステップe)が、
e)iii)それぞれの変換器について前記複数の歪み画像から歪み波位相画像を作成するステップをさらに含むことを特徴とする、
磁気共鳴画像形成(MRI)システムで磁気共鳴エラストグラム(MRE)を作成する方法。 - ステップe)iii)が、前記複数の歪み画像にフーリエ変換を実行するステップを含む、請求項1に記載の方法。
- 前記設定値の1つが、前記変換器を駆動するために利用される信号の位相であり、かつ、その位相設定値は、前記歪み波位相画像から引き出される、請求項1に記載の方法。
- ステップd)において取得された画像データが、前記変換器が複数の相異なる位相で駆動されている間に取得され、かつ、前記複数の歪み画像が、該複数の相異なる位相に対応している、請求項1に記載の方法。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/122424 | 2005-05-05 | ||
US11/122,424 US7307423B2 (en) | 2005-05-05 | 2005-05-05 | Magnetic resonance elastography using multiple drivers |
Publications (2)
Publication Number | Publication Date |
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JP2006314784A JP2006314784A (ja) | 2006-11-24 |
JP5047537B2 true JP5047537B2 (ja) | 2012-10-10 |
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JP2006128457A Active JP5047537B2 (ja) | 2005-05-05 | 2006-05-02 | 複数の駆動装置を利用する磁気共鳴エラストグラフィ |
Country Status (3)
Country | Link |
---|---|
US (1) | US7307423B2 (ja) |
EP (1) | EP1720028B1 (ja) |
JP (1) | JP5047537B2 (ja) |
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US9747885B2 (en) | 2015-03-26 | 2017-08-29 | Kabushiki Kaisha Toshiba | Noise reduction system |
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US20100049029A1 (en) * | 2008-08-20 | 2010-02-25 | Hong Kong Applied Science And Technology Research Institute Co., Ltd. | Piezoelectric magnetic resonance elastograph (mre) driver system |
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JP5376593B2 (ja) | 2009-11-09 | 2013-12-25 | 公立大学法人首都大学東京 | 磁気共鳴エラストグラム(mre)の作成方法及び作成装置、並びに磁気共鳴エラストグラム(mre)作成用のボールバイブレータ |
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Cited By (3)
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JP2011516179A (ja) * | 2008-04-04 | 2011-05-26 | メイヨ フォンデーシヨン フォー メディカル エジュケーション アンド リサーチ | 有限媒質モデルを用いた核磁気共鳴弾性率計測インバージョン法 |
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Also Published As
Publication number | Publication date |
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EP1720028B1 (en) | 2011-11-30 |
US7307423B2 (en) | 2007-12-11 |
EP1720028A1 (en) | 2006-11-08 |
US20060253020A1 (en) | 2006-11-09 |
JP2006314784A (ja) | 2006-11-24 |
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