JP2009545406A - 非線形イメージングのためのパルスインバージョンシーケンス - Google Patents
非線形イメージングのためのパルスインバージョンシーケンス Download PDFInfo
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Abstract
Description
これらイメージング方式には、基本周波数抑制不良に起因して欠点を有する。
組織模倣媒体中の非線形高周波ビームを計算し、重み付けPI信号処理の効率に対する変換器回転の影響を吟味するシミュレーションツールが開発された。この例では、20MHzガウスパルス(2MPa、50%帯域幅)を散乱及び減衰(1.0dB×cm-1×MHz-1)媒体中に伝搬させ、その結果、40MHzで2次高調波信号が生じた。基本周波数抑制を互いに異なるPIシーケンスについて或る範囲のパルス間角度(0.15°〜1.5°)について吟味した。0.15°のパルス間角度では、1回転につき2,400本の線密度を用いるプロトタイプシステムで実施された初期ハーモニックIVUS実験で用いられた角度に一致している。1.5°のパルス間角度では、1回転当たり256本の線密度の角度に一致している。
〔表1〕
シーケンス 18〜22MHzの平均減少 追加の減少対基本PI
〔1 1〕(基本PI) 28.2dB 0dB
〔1 2 1〕 34.8dB 6.6dB
〔1 2 2 2 2 2 1 〕 38.8dB 10.6dB
〔1 3 4 4 4 3 1 〕 38.5dB 10.3dB
〔表2〕
シーケンス 18〜22MHzの平均減少 追加の減少対基本PI
〔1 1〕(基本PI) 23.0dB 0dB
〔1 2 1〕 32.3dB 9.3dB
〔1 2 2 2 2 2 1 〕 35.9dB 12.9dB
〔1 3 4 4 4 3 1 〕 36.5dB 13.5dB
〔1〕ボウカズ・エイ(Bouakaz A),デ・ジョン・エヌ(de Jong N)著,「ネイティブ・ティッシュー・イメージング・アット・スーパーハーモニック・フリクエンシーズ(Native tissue imaging at superharmonic frequencies)」,IEEEトランズアクション・ウルトラソニック・フェロエレクトロニック・フリクエンス・コントロール(IEEE Trans Ultrason Ferroelec Freq Control),2003年,第50巻,第5号,p.496〜506
〔2〕ホープ・シンプソン・デー・エイチ・(Hope Simpson D H),チン・シー・ティー(Chin CT),バーンズ・ピイ・エヌ(Burns PN)著,「パルス・インバージョン・ドップラー:ア・ニュー・メソッド・フォー・ディテクティング・ノンリニアー・エコーズ・フロム・マイクロバブル・コントラスト・エージェント(Pulse inversion doppler: A new method for detecting nonlinear echoes from microbubble contrast agents)」,IEEEトランズアクション・ウルトラソニック・フェロエレクトロニック・フリクエンス・コントロール(IEEE Trans Ultrason Ferroelec Freq Control),1999年,第46巻,第2号,p.372〜382
〔3〕ゴーツ・ディー・イー(Goertz DE),フリジリンク・エム・イー(Frijlink ME),デ・ジョン・エヌ(de Jong N),バン・ダー・スティーン・エイ・エフ・ダブリュー(van der Steen AFW)著,「ノンリニアー・イントラバスキュラー・ウルトラサウンド・コントラスト・イメージング(Nonlinear Intravascular Ultrasound Contrast Imaging)」、ウルトラサウンド・イン・メディスン・アンド・バイオロジー(Ultrasound in Med & Biol),2006年,第32巻,第4号,p.491〜502
Claims (55)
- nは、2以上である、請求項1記載の方法。
- nは、3以上である、請求項1記載の方法。
- a,b,cは、それぞれ、1、2、1に等しい、請求項1記載の方法。
- 前記受け取ったエコー信号は、高調波応答を含む、請求項1記載の方法。
- 前記受け取ったエコー信号は、低調波応答を含む、請求項1記載の方法。
- 前記受け取ったエコー信号は、超高調波応答(ultraharmonic response)を含む、請求項1記載の方法。
- カテーテル利用型超音波変換器を前記患者の体内の関心のある部位に導入するステップと、
前記変換器を機械的に走査して前記関心のある部位を画像化するステップとを更に有する、請求項1記載の方法。 - 前記関心のある部位は、動脈である、請求項8記載の方法。
- 造影剤を前記患者の体内に導入するステップを更に有し、前記励起パルスは、組織及び前記造影剤と互いに異なる仕方で相互作用する、請求項8記載の方法。
- 前記造影剤は、前記患者の体内の前記変換器の近くに注入される、請求項10記載の方法。
- 前記造影剤は、脈管の脈管(vasa vasorum)である微小血管内に配置される、請求項10記載の方法。
- 前記励起パルスは、15MHz以上の搬送周波数で送信される、請求項10記載の方法。
- 前記励起パルスは、20MHz以上の搬送周波数で送信される、請求項10記載の方法。
- 前記変換器を機械的に走査するステップは、前記変換器を回転させるステップから成る、請求項8記載の方法。
- 前記変換器は、変換器アレイから成り、前記方法は、
前記変換器アレイを機械的に動かすステップと、
前記変換器アレイを動かしているときに前記変換器アレイにより多数の2次元画像を得るステップと、
前記多数の2次元画像を組み合わせて3次元画像を形成するステップとを更に有する、請求項1記載の方法。 - 前記変換器は、単一の変換器要素から成り、前記方法は、
前記単一の変換器要素を機械的に動かすステップと、
前記単一の変換器要素を動かしているときに前記単一の変換器要素により多数の2次元画像を得るステップと、
前記多数の2次元画像を組み合わせて3次元画像を形成するステップとを更に有する、請求項1記載の方法。 - 造影剤を前記患者の体内に導入するステップを更に有し、前記励起パルスは、組織及び前記造影剤と互いに異なる仕方で相互作用する、請求項1記載の方法。
- 前記造影剤は、微小気泡から成る、請求項18記載の方法。
- 前記造影剤は、特有の性質の部位又は領域に選択的に配置されるようになっている、請求項18記載の方法。
- 前記造影剤は、標的とされない、請求項18記載の方法。
- 前記造影剤は、前記患者の体内の前記変換器の近くに注入される、請求項18記載の方法。
- 前記造影剤は、前記変換器から離れた場所に向けて前記患者の体内に注入される、請求項18記載の方法。
- 気泡破壊イメージング技術を用いて前記患者の体内を画像化するステップを更に有する、請求項19記載の方法。
- 2周波数イメージング技術を用いて前記患者の体内を画像化するステップを更に有する、請求項19記載の方法。
- 反復率イメージング技術を用いて前記患者の体内を画像化するステップを更に有する、請求項19記載の方法。
- 気泡記憶イメージング技術を用いて前記患者の体内を画像化するステップを更に有する、請求項19記載の方法。
- 気泡破壊イメージング技術、2周波数イメージング技術、反復率イメージング技術、気泡記憶イメージング技術、又はこれらの組合せを用いて前記患者の体内を画像化するステップを更に有する、請求項19記載の方法。
- nは、2以上である、請求項29記載の方法。
- a,b,cは、それぞれ、1、2、1に等しい、請求項29記載の方法。
- 前記受け取ったエコー信号は、高調波応答を含む、請求項29記載の方法。
- 前記受け取ったエコー信号は、低調波応答を含む、請求項29記載の方法。
- 前記受け取ったエコー信号は、超高調波応答(ultraharmonic response)を含む、請求項29記載の方法。
- カテーテル利用型超音波変換器を前記患者の体内の関心のある部位に導入するステップと、
前記変換器を機械的に走査して前記関心のある部位を画像化するステップとを更に有する、請求項29記載の方法。 - 前記関心のある部位は、動脈である、請求項35記載の方法。
- 造影剤を前記患者の体内に導入するステップを更に有し、前記励起パルスは、組織及び前記造影剤と互いに異なる仕方で相互作用する、請求項35記載の方法。
- 前記造影剤は、前記患者の体内の前記変換器の近くに注入される、請求項37記載の方法。
- 前記造影剤は、脈管の脈管(vasa vasorum)である微小血管内に配置される、請求項37記載の方法。
- 前記励起パルスは、15MHz以上の搬送周波数で送信される、請求項37記載の方法。
- 前記励起パルスは、20MHz以上の搬送周波数で送信される、請求項37記載の方法。
- 前記変換器を機械的に走査するステップは、前記変換器を回転させるステップから成る、請求項35記載の方法。
- 前記変換器は、変換器アレイから成り、前記方法は、
前記変換器アレイを機械的に動かすステップと、
前記変換器アレイを動かしているときに前記変換器アレイにより多数の2次元画像を得るステップと、
前記多数の2次元画像を組み合わせて3次元画像を形成するステップとを更に有する、請求項29記載の方法。 - 前記変換器は、単一の変換器要素から成り、前記方法は、
前記単一の変換器要素を機械的に動かすステップと、
前記単一の変換器要素を動かしているときに前記単一の変換器要素により多数の2次元画像を得るステップと、
前記多数の2次元画像を組み合わせて3次元画像を形成するステップとを更に有する、請求項29記載の方法。 - 造影剤を前記患者の体内に導入するステップを更に有し、前記励起パルスは、組織及び前記造影剤と互いに異なる仕方で相互作用する、請求項29記載の方法。
- 前記造影剤は、微小気泡から成る、請求項45記載の方法。
- 前記造影剤は、特有の性質の部位又は領域に選択的に配置されるようになっている、請求項45記載の方法。
- 前記造影剤は、標的とされない、請求項45記載の方法。
- 前記造影剤は、前記患者の体内の前記変換器の近くに注入される、請求項45記載の方法。
- 前記造影剤は、前記変換器から離れた場所に向けて前記患者の体内に注入される、請求項45記載の方法。
- 気泡破壊イメージング技術を用いて前記患者の体内を画像化するステップを更に有する、請求項46記載の方法。
- 2周波数イメージング技術を用いて前記患者の体内を画像化するステップを更に有する、請求項46記載の方法。
- 反復率イメージング技術を用いて前記患者の体内を画像化するステップを更に有する、請求項46記載の方法。
- 気泡記憶イメージング技術を用いて前記患者の体内を画像化するステップを更に有する、請求項46記載の方法。
- 気泡破壊イメージング技術、2周波数イメージング技術、反復率イメージング技術、気泡記憶イメージング技術、又はこれらの組合せを用いて前記患者の体内を画像化するステップを更に有する、請求項46記載の方法。
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US20080077018A1 (en) | 2008-03-27 |
EP2076179B1 (en) | 2018-07-04 |
CA2659645C (en) | 2015-06-30 |
CA2659645A1 (en) | 2008-02-07 |
JP5154554B2 (ja) | 2013-02-27 |
WO2008016992A1 (en) | 2008-02-07 |
EP2076179A1 (en) | 2009-07-08 |
US7967753B2 (en) | 2011-06-28 |
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