JP5980126B2 - 単一および多重チャネル受信コイルを用いた同時マルチスライス磁気共鳴画像法 - Google Patents
単一および多重チャネル受信コイルを用いた同時マルチスライス磁気共鳴画像法 Download PDFInfo
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Description
112 データ取得サーバ
114 データ処理サーバ
118 傾斜システム
120 RFシステム
130 生理的取得コントローラ
132 スキャンルームインタフェース
210 周波数合成装置
230 基準周波数発生装置
602 スライス位置の第1グループ
606 スライス位置の第2グループ
Claims (24)
- 磁気共鳴画像(MRI)システムを用いて、対応する複数のスライス位置から同時に取得される画像データから、対象を示す複数の画像を再構成する方法において、
a)異なる位相を有するRF(radio frequency)エネルギーを、複数のスライス位置にそれぞれに適用した後に、前記MRIシステムで前記複数のスライス位置から画像データを同時に取得するステップと、
b)前記ステップa)で前記複数のスライス位置に適用された異なる位相の1つを有するRFエネルギーを、前記位相に対応する複数のスライス位置の1つに適用した後に、前記MRIシステムで参照画像データを取得するステップと、
c)前記ステップa)で適用された前記RFエネルギーの異なる位相のそれぞれに対して前記ステップb)を繰り返して、前記複数のスライス位置のそれぞれに対して参照画像データを取得するステップと、
d)前記ステップa)で取得される前記画像データから、エイリアス画像を再構成するステップと、
e)前記ステップb)および前記ステップc)で取得される前記参照画像データから、参照画像を再構成するステップと、
f)前記ステップd)で再構成された前記エイリアス画像、および、前記ステップe)で再構成された前記参照画像を用いて、前記複数のスライス位置のそれぞれに対して非エイリアス画像を生成するステップと、を有する
ことを特徴とする画像データから対象を示す複数の画像を再構成する方法。 - 前記ステップf)は、前記参照画像の大きさ、前記参照画像の位相、および、前記エイリアス画像を、前記非エイリアス画像のそれぞれに関連付ける連立方程式を解くステップを有する
ことを特徴とする請求項1に記載の方法。 - 前記ステップf)の連立方程式を解くステップは、最小二乗推定を用いることを含む
ことを特徴とする請求項2に記載の方法。 - 前記ステップf)の連立方程式を解くステップは、前記各参照画像の大きさと、前記参照画像の1つと同じ位相の正弦および余弦の少なくとも1つと、の積である項目を有するエンコードマトリックス、を用いることを含む
ことを特徴とする請求項2に記載の方法。 - 前記ステップf)は、前記非エイリアス画像を生成する前に、位相ドリフトに対して前記エイリアス画像を補正することを含む
ことを特徴とする請求項1に記載の方法。 - 前記ステップa)で取得される画像データは、画像データの時間的経過である
ことを特徴とする請求項1に記載の方法。 - 前記画像データの時間的経過は、前記ステップa)における前記画像データの取得中に前記対象で生じるニューロン活動を表す機能的画像データである
ことを特徴とする請求項6に記載の方法。 - 前記ステップa)で取得される前記画像データは、多重チャネル受信コイルアレイで取得され、
前記ステップb)で取得される前記参照画像データは、前記多重チャネル受信コイルアレイの多重チャネルの1つに対して取得され、
前記ステップc)は、前記複数のスライス位置のそれぞれに対して前記ステップb)を繰り返す前に、前記多重チャネル受信コイルアレイの各チャネルに対してステップb)を繰り返すステップを含む
ことを特徴とする請求項1に記載の方法。 - 前記ステップf)は、前記参照画像の大きさ、前記参照画像の位相、および、前記エイリアス画像を、前記非エイリアス画像のそれぞれに関連付ける連立方程式を解くステップを有する
ことを特徴とする請求項8に記載の方法。 - 前記ステップf)は、前記多重チャネル受信コイルアレイの異なるコイルのそれぞれで、前記各スライス位置から取得される前記参照画像データに対応する前記参照画像のそれぞれを平均することよって、前記各スライス位置に対して平均参照画像を生成することを含む
ことを特徴とする請求項9に記載の方法。 - 前記連立方程式が、前記各平均参照画像の大きさと、前記平均参照画像の1つと同じ位相の正弦および余弦の少なくとも1つと、の積である項目を有するエンコードマトリックス、含む
ことを特徴とする請求項10に記載の方法。 - 前記ステップf)は、
i)特定のスライス位置に対して、前記多重チャネル受信コイルアレイの異なるコイルから取得される参照画像データに対応する前記参照画像のそれぞれを合計するステップと、
ii)前記ステップf)のi)で生成される合計参照画像と前記特定のスライス位置に対応する前記エイリアス画像との位相差を、算出するステップと、
iii)前記算出された位相差を用いて、位相補正係数を決定するステップと、
iv)前記位相補正係数を前記対応するエイリアス画像に適用するステップと、を有する
ことを特徴とする請求項8に記載の方法。 - 前記ステップf)のiii)は、前記算出された位相差を、前記MRIシステムの一部を成す傾斜磁場コイルにおけるノイズおよび熱伝達から生じる位相ドリフトに関する条件を含む多項式に、適合させることを含む
ことを特徴とする請求項12に記載の方法。 - 前記ステップa)で適用される前記RFエネルギーは、前記スライス位置のそれぞれの位置および位相を定義する所望のスライスプロファイルでフーリエ変換を行うことによって、調整される
ことを特徴とする請求項1に記載の方法。 - g)前記ステップa)で画像データを取得する前にスピン調整パルスシーケンスを行うステップ、をさらに有する
ことを特徴とする請求項1に記載の方法。 - 前記ステップg)で行われる前記スピン調整パルスシーケンスは、脂肪抑制および拡散強調の少なくとも1つを提供する
ことを特徴とする請求項15に記載の方法。 - 前記ステップa)で取得される前記画像データは、アンダーサンプリングされる画像データである
ことを特徴とする請求項1に記載の方法。 - 前記ステップf)は、k空間の一部のサンプリングを構成する再構成法を用いて、非エイリアス画像を生成することをさらに含む
ことを特徴とする請求項17に記載の方法。 - 前記k空間の一部のサンプリングを構成する再構成法は、SENSE法およびGRAPPA法の少なくとも1つを含む
ことを特徴とする請求項18に記載の方法。 - 前記ステップa)で取得される前記画像データは、前記画像データが画像フレームの時間的経過を示すように、一定期間で取得され、
前記ステップf)は、前記複数のスライス位置のそれぞれに対して複数の画像フレームを再構成することを含み、
それにより、前記複数のスライス位置のそれぞれに対する前記複数の画像フレームが、前記複数のスライス位置のそれぞれに対して画像の時系列を形成する
ことを特徴とする請求項1に記載の方法。 - 前記対象は、脳であり、
前記複数のスライス位置は、前記脳の全体積を実質的にカバーする
ことを特徴とする請求項1に記載の方法。 - 前記対象は、脳であり、
前記ステップa)で取得される前記画像データは、前記脳の全体積を実質的にカバーする
ことを特徴とする請求項1に記載の方法。 - 前記ステップa)で画像データを取得する前に、前記複数のスライス位置のぞれぞれの厚みを選択するステップ、をさらに有する
ことを特徴とする請求項1に記載の方法。 - 前記複数のスライス位置のいくつかの厚みは、前記複数のスライス位置の他の厚みとは異なる
ことを特徴とする請求項23に記載の方法。
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US30817010P | 2010-02-25 | 2010-02-25 | |
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PCT/US2011/026250 WO2011106649A1 (en) | 2010-02-25 | 2011-02-25 | Method for simultaneous multi-slice magnetic resonance imaging using single and multiple channel receiver coils |
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EP (1) | EP2539728B1 (ja) |
JP (1) | JP5980126B2 (ja) |
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AU (1) | AU2011220469A1 (ja) |
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WO2011106649A1 (en) | 2011-09-01 |
CN102870000A (zh) | 2013-01-09 |
US9414766B2 (en) | 2016-08-16 |
JP2013521013A (ja) | 2013-06-10 |
EP2539728B1 (en) | 2017-11-15 |
CN102870000B (zh) | 2015-11-25 |
CA2790446A1 (en) | 2011-09-01 |
US20120319686A1 (en) | 2012-12-20 |
AU2011220469A1 (en) | 2012-08-30 |
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