JP2002315731A5 - - Google Patents

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JP2002315731A5
JP2002315731A5 JP2001122213A JP2001122213A JP2002315731A5 JP 2002315731 A5 JP2002315731 A5 JP 2002315731A5 JP 2001122213 A JP2001122213 A JP 2001122213A JP 2001122213 A JP2001122213 A JP 2001122213A JP 2002315731 A5 JP2002315731 A5 JP 2002315731A5
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image
magnetic resonance
imaging apparatus
reception
resonance imaging
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JP2002315731A (en
JP4047553B2 (en
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Priority to JP2001122213A priority Critical patent/JP4047553B2/en
Priority to US10/468,963 priority patent/US6876201B2/en
Priority to PCT/JP2002/001653 priority patent/WO2002065907A1/en
Priority to EP02703889A priority patent/EP1371327A4/en
Priority to EP09014853A priority patent/EP2159590A1/en
Publication of JP2002315731A publication Critical patent/JP2002315731A/en
Publication of JP2002315731A5 publication Critical patent/JP2002315731A5/ja
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【０００６】
【課題を解決するための手段】
上記目的を達成するために、本発明は少なくとも２個のＲＦ受信コイルを備え、２以上の前記ＲＦ受信コイルで受信する核磁気共鳴信号の計測を計測空間のエンコードステップを間引くよう計測してＲＦ受信コイル毎に画像を取得し、前記ＲＦ受信コイル毎の受信感度分布を用いて各画像の折り返し除去の演算を行うと共に前記各画像を合成して１枚の画像を得る制御手段を有する磁気共鳴イメージング装置において、前記制御手段は、前記折り返し除去演算において、前記受信感度分布の低信号領域と高信号領域とで異なる受信感度分布を用いてもよい。
或いは、少なくとも２個のＲＦ受信コイルを備え、２以上の前記ＲＦ受信コイルで受信する核磁気共鳴信号の計測を計測空間のエンコードステップを間引くよう計測してＲＦ受信コイル毎に画像を取得し、前記ＲＦ受信コイル毎の受信感度分布を用いて各画像の折り返し除去の演算を行うと共に前記各画像を合成して１枚の画像を得る制御手段を有する磁気共鳴イメージング装置において、前記制御手段は、前記折り返し除去演算において、前記受信感度分布の高信号領域のみを用いてもよい。
また、前記制御手段は、前記折り返し除去演算において、前記低信号領域を所定の一定値に置き換えてもよい。
また、前記制御手段は、前記折り返し除去演算において、前記受信感度分布の低信号領域と高信号領域とを分けるマスクを用いてもよい。
また、前記制御手段は、所定の閾値に基づいて、前記２以上のＲＦ受信コイルの受信感度分布を含む全体領域の受信感度分布用いて、その前記低信号領域と前記高信号領域を分けるマスクを作成してもよい。
また、前記制御手段は、前記全体領域の受信感度分布を、前記各ＲＦ受信コイルの受信感度分布を合成して求めてもよい。 0006
[Means for solving problems]
In order to achieve the above object, the present invention includes at least two RF receiving coils, and measures the nuclear magnetic resonance signal received by the two or more RF receiving coils so as to thin out the encoding steps in the measurement space. Magnetic resonance having a control means for acquiring an image for each receiving coil, performing an operation for removing wrapping of each image using the receiving sensitivity distribution for each RF receiving coil, and synthesizing the respective images to obtain one image. In the imaging apparatus, the control means may use different reception sensitivity distributions in the low signal region and the high signal region of the reception sensitivity distribution in the folding removal calculation.
Alternatively, at least two RF receiving coils are provided, and the measurement of the nuclear magnetic resonance signal received by the two or more RF receiving coils is measured so as to thin out the encoding steps in the measurement space, and an image is acquired for each RF receiving coil. In a magnetic resonance imaging apparatus having a control means for performing a folding removal calculation of each image using the reception sensitivity distribution for each RF reception coil and synthesizing the images to obtain one image, the control means is used. In the folding removal calculation, only the high signal region of the reception sensitivity distribution may be used.
Further, the control means may replace the low signal region with a predetermined constant value in the folding removal calculation.
Further, the control means may use a mask that separates the low signal region and the high signal region of the reception sensitivity distribution in the folding removal calculation.
Further, the control means uses the reception sensitivity distribution of the entire region including the reception sensitivity distributions of the two or more RF reception coils based on a predetermined threshold value to create a mask that separates the low signal region and the high signal region. You may create it.
Further, the control means may obtain the reception sensitivity distribution in the entire region by synthesizing the reception sensitivity distribution of each RF reception coil.

Claims (9)

少なくとも２個のＲＦ受信コイルを備え、２以上の前記ＲＦ受信コイルで受信する核磁気共鳴信号の計測を計測空間のエンコードステップを間引くよう計測してＲＦ受信コイル毎に画像を取得し、前記ＲＦ受信コイル毎の受信感度分布を用いて各画像の折り返し除去の演算を行うと共に前記各画像を合成して１枚の画像を得る制御手段を有する磁気共鳴イメージング装置において、
前記制御手段は、前記折り返し除去演算において、前記受信感度分布の低信号領域と高信号領域とで異なる受信感度分布を用いることを特徴とする磁気共鳴イメージング装置。 At least two RF receiving coils are provided, the measurement of nuclear magnetic resonance signals received by two or more RF receiving coils is measured so as to thin out the encoding step of the measurement space, and an image is acquired for each RF receiving coil. In a magnetic resonance imaging apparatus having a control means for performing a folding removal calculation of each image using a reception sensitivity distribution for each reception coil and combining the images to obtain one image.
The magnetic resonance imaging apparatus characterized in that the control means uses different reception sensitivity distributions in a low signal region and a high signal region of the reception sensitivity distribution in the aliasing removal calculation . 少なくとも２個のＲＦ受信コイルを備え、２以上の前記ＲＦ受信コイルで受信する核磁気共鳴信号の計測を計測空間のエンコードステップを間引くよう計測してＲＦ受信コイル毎に画像を取得し、前記ＲＦ受信コイル毎の受信感度分布を用いて各画像の折り返し除去の演算を行うと共に前記各画像を合成して１枚の画像を得る制御手段を有する磁気共鳴イメージング装置において、
前記制御手段は、前記折り返し除去演算において、前記受信感度分布の高信号領域のみを用いることを特徴とする磁気共鳴イメージング装置。 At least two RF receiving coils are provided, the measurement of nuclear magnetic resonance signals received by two or more RF receiving coils is measured so as to thin out the encoding step of the measurement space, and an image is acquired for each RF receiving coil. In a magnetic resonance imaging apparatus having a control means for performing a folding removal calculation of each image using a reception sensitivity distribution for each reception coil and combining the images to obtain one image.
The magnetic resonance imaging apparatus , wherein the control means uses only a high signal region of the reception sensitivity distribution in the aliasing removal calculation . 前記制御手段は、前記折り返し除去演算において、前記低信号領域を所定の一定値に置き換えることを特徴とする請求項１記載の磁気共鳴イメージング装置。The magnetic resonance imaging apparatus according to claim 1 , wherein the control unit replaces the low signal region with a predetermined constant value in the aliasing removal calculation . 前記制御手段は、前記折り返し除去演算において、前記受信感度分布の低信号領域と高信号領域とを分けるマスクを用いることを特徴とする請求項１乃至３のいずれかに記載の磁気共鳴イメージング装置。 4. The magnetic resonance imaging apparatus according to claim 1, wherein the control unit uses a mask that separates a low signal region and a high signal region of the reception sensitivity distribution in the aliasing removal calculation . 前記制御手段は、所定の閾値に基づいて、前記２以上のＲＦ受信コイルの受信感度分布を含む全体領域の受信感度分布用いて、その前記低信号領域と前記高信号領域を分けるマスクを作成することを特徴とする請求項４記載の磁気共鳴イメージング装置。 The control means creates a mask for separating the low signal region and the high signal region using the reception sensitivity distribution of the entire region including the reception sensitivity distribution of the two or more RF receiving coils based on a predetermined threshold value. The magnetic resonance imaging apparatus according to claim 4 . 前記制御手段は、前記全体領域の受信感度分布を、前記各ＲＦ受信コイルの受信感度分布を合成して求めることを特徴とする請求項５記載の磁気共鳴イメージング装置。 6. The magnetic resonance imaging apparatus according to claim 5, wherein the control means obtains the reception sensitivity distribution of the entire region by synthesizing the reception sensitivity distribution of the RF receiving coils . 前記全体領域を含む領域の受信感度分布を持つ広範囲ＲＦ受信コイルを備え、
前記制御手段は、前記全体領域の受信感度分布として、前記広範囲ＲＦ受信コイルの受信感度分布を用いることを特徴とする請求項５記載の磁気共鳴イメージング装置。 A wide-range RF receiving coil having a receiving sensitivity distribution in a region including the entire region,
6. The magnetic resonance imaging apparatus according to claim 5, wherein the control means uses the reception sensitivity distribution of the wide-range RF reception coil as the reception sensitivity distribution of the entire region . 少なくとも２個のＲＦ受信コイルを備え、前記ＲＦ受信コイルで受信する核磁気共鳴信号の計測を計測空間のエンコードステップを間引くよう計測して各ＲＦ受信コイル毎に感度画像及び形態画像を取得し、前記ＲＦ受信コイルの感度画像に基づく感度分布から各形態画像の折り返し除去の演算を行うと共に前記各形態画像を結合して１枚の形態画像を得る制御手段を有する磁気共鳴イメージング装置において、前記制御手段は、各ＲＦ受信コイルで取得した感度画像を結合した全体感度画像を作成し、前記全体感度画像を用いて各ＲＦ受信コイルの感度分布を算出し、前記全体感度画像を用いて画像の非画像領域と画像領域を分けるマスクを作成し、前記マスクに基づいて演算を行うことを特徴とする磁気共鳴イメージング装置。 Including at least two RF receiving coils, measuring the nuclear magnetic resonance signal received by the RF receiving coil so as to thin out the encoding step of the measurement space, and obtaining a sensitivity image and a morphological image for each RF receiving coil; In the magnetic resonance imaging apparatus, the control unit includes a control unit that calculates the fold-off of each morphological image from the sensitivity distribution based on the sensitivity image of the RF receiving coil and combines the morphological images to obtain one morphological image. The means creates an overall sensitivity image obtained by combining the sensitivity images acquired by the respective RF receiving coils, calculates a sensitivity distribution of each RF receiving coil using the overall sensitivity image, and uses the overall sensitivity image to determine whether the image A magnetic resonance imaging apparatus characterized in that a mask for separating an image area and an image area is created and an operation is performed based on the mask . 計測領域全体を受信する第１のＲＦ受信コイルと、前記計測領域を少なくとも２つ以上分割した領域を受信する複数の第２のＲＦ受信コイルを備え、前記各第２のＲＦ受信コイルで受信する核磁気共鳴信号の計測を計測空間のエンコードステップを間引くよう計測して前記第２のＲＦ受信コイル毎に感度画像及び形態画像を取得し、前記第１のＲＦ受信コA first RF receiver coil that receives the entire measurement region and a plurality of second RF receiver coils that receive a region obtained by dividing at least two of the measurement regions, and receives each of the second RF receiver coils The measurement of the nuclear magnetic resonance signal is measured so as to thin out the encoding step of the measurement space, and a sensitivity image and a morphological image are acquired for each of the second RF reception coils, and the first RF reception core is obtained. イルによる感度画像及び前記第２のＲＦ受信コイルによる感度画像から求めた感度分布から前記形態画像の折り返し除去の演算を行うと共に前記各形態画像を結合して１枚の形態画像を得る制御手段を有する磁気共鳴イメージング装置において、前記制御手段は、前記受信感度分布において非画像領域と画像領域を分けたマスクを作成し、前記マスクを用いて演算を行うことを特徴とする磁気共鳴イメージング装置。Control means for performing a fold-back removal calculation of the morphological image from the sensitivity image obtained from the sensitivity image by the il and the sensitivity image by the second RF receiving coil and combining the morphological images to obtain one morphological image In the magnetic resonance imaging apparatus, the control unit creates a mask in which a non-image area and an image area are divided in the reception sensitivity distribution, and performs an operation using the mask.
JP2001122213A 2001-02-23 2001-04-20 Magnetic resonance imaging system Expired - Fee Related JP4047553B2 (en)

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Application Number Priority Date Filing Date Title
JP2001122213A JP4047553B2 (en) 2001-04-20 2001-04-20 Magnetic resonance imaging system
EP09014853A EP2159590A1 (en) 2001-02-23 2002-02-25 Magnetic resonance imaging apparatus and method
PCT/JP2002/001653 WO2002065907A1 (en) 2001-02-23 2002-02-25 Magnetic resonance imaging apparatus and method
EP02703889A EP1371327A4 (en) 2001-02-23 2002-02-25 Magnetic resonance imaging apparatus and method
US10/468,963 US6876201B2 (en) 2001-02-23 2002-02-25 Magnetic resonance imaging apparatus and method

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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
JP4068954B2 (en) * 2002-12-26 2008-03-26 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 MRI equipment
JP3929047B2 (en) * 2003-04-24 2007-06-13 株式会社日立メディコ Magnetic resonance imaging system
US6919722B2 (en) * 2003-10-09 2005-07-19 Ge Medical Systems Global Technology Company, Llc Image quality improvement for SENSE with low signal regions
JP4698231B2 (en) * 2004-06-11 2011-06-08 株式会社日立メディコ Magnetic resonance diagnostic equipment
JP4679158B2 (en) * 2004-10-08 2011-04-27 株式会社日立メディコ Magnetic resonance imaging system
WO2006109550A1 (en) * 2005-03-30 2006-10-19 Hitachi Medical Corporation Magnetic resonance imaging device and method
CA2626678A1 (en) * 2005-10-18 2007-04-26 Tursiop Technologies, Llc Method and apparatus for high-gain magnetic resonance imaging
JP4980662B2 (en) * 2006-06-30 2012-07-18 株式会社日立メディコ Magnetic resonance imaging system
JP4817381B2 (en) * 2006-10-17 2011-11-16 株式会社日立メディコ Magnetic resonance imaging system
JP5156958B2 (en) * 2007-07-17 2013-03-06 株式会社日立メディコ Magnetic resonance imaging system
JP5686533B2 (en) * 2009-07-10 2015-03-18 株式会社東芝 Magnetic resonance imaging apparatus, image processing apparatus, and image processing method
US9864032B2 (en) * 2010-01-05 2018-01-09 National Health Research Institutes Magnetic resonance imaging system
DE102011088828B4 (en) * 2011-12-16 2013-08-29 Siemens Aktiengesellschaft Creation of an MR image of an examination object using a mask created for a reception coil element
US10534060B2 (en) * 2013-06-10 2020-01-14 Toshiba Medical Systems Corporation Parallel MRI with spatially misregistered signal
JP6518559B2 (en) * 2015-09-18 2019-05-22 株式会社日立製作所 Magnetic resonance imaging apparatus and method

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