JP2011530352A - 腹部大動脈瘤の直径を測定するための装置、システム、方法 - Google Patents
腹部大動脈瘤の直径を測定するための装置、システム、方法 Download PDFInfo
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Abstract
【選択図】図3−1
Description
本発明の実施形態は1以上のコンピュータプロセッサ又は他の装置により実行されるプログラムモジュールのようなコンピュータの読取り可能な命令、このような命令が記憶されるコンピュータの読取り可能な媒体、および/またはプロセッサ/装置自体の通常の文脈で説明されることができる。通常、プログラムモジュールは特定のタスクを行い、特定の抽出データタイプを実行するルーチン、プログラム、オブジェクト、コンポーネント、データ構造等を含んでいる。典型的にプログラムモジュールの機能は種々の実施形態において所望に応じて組み合わせられ、あるいは分配されることができる。
図2の(2−1)と(2−4)はトランシーバ、走査平面の回転アレイを有する走査コーン、RF線解析を収集できる種々の超音波システムのアレイの走査平面の部分概略図および部分等角図を示している。
AAA走査モードのフィールド評価期間中、2Dの実時間超音波器機が、実時間のBモード画像フィードバックにより関心のある領域を検索することによって最適な走査位置を発見するために好ましく取り付けられることが決定された。BVI9600モデルは利用可能なデータの収集前に3Dデータセットが有効であるか否かをユーザに通知するように最適化されている。これは先のBVI6500 AAAモードの能力ではなく、ここでは1つのBモード画像(大動脈の断面)のみが3D走査の完了後にユーザが再検討するために与えられた。BVI6500 Bモード画像は3Dデータセット状態を表していない。
条件1:現在位置=ブロック110で75%以上利用可能=ブロック112で良好な走査=動きが示されない=AAA検出アルゴリズムを開始(図11参照)。
A.前壁及び後壁。AAA測定のための最適な位置が比較された走査線の「利用可能性」計算105に基づいて実現されると、前述され図9−2に示されているように、AAA検出アルゴリズム120が使用されることができる。
図14は図11の初期壁発見サブアルゴリズムのフローチャートを示している。初期壁発見122プロセスはあらゆるAモード操作線で実行されることができ、例えばプロセスブロック140で開始する15または16のサンプルセットを使用して平均化およびローパス濾波を受けることができる。次に、プロセスブロック142における局部的勾配は7つのサンプルで取られる中心差分公式を使用して各サンプル点で計算されることができる。中心差分公式は以下の式4−9(式4−9)により規定される。
x=(38−φ)cos(π−θ)
y=(38−φ)sin(π−θ) (10)
三角関数はθ値の表について計算され、それによって余弦と正弦計算は考察中の各点に付いて行われる必要はない。最も近い平面は各平面から重心までの最短のベクトルを発見することにより発見されることができる。1つの平面から1つの点までの最短のベクトルは平面上の重心の射影に対して垂直であることができる。平面上の重心の射影は重心ベクトルcと平面規定ベクトルaのドット積を平面規定ベクトルの長さで割算したものとして規定される。平面規定ベクトルが単位ベクトルであるならば、除算演算は必要とされない。射影に対する垂直を発見するため、式11に示されているように重心ベクトルから射影ベクトルを減算することで十分である。
Claims (9)
- 問題とする領域中の腹部大動脈瘤を検出するためのシステムにおいて、
超音波エネルギを送出し、複数の走査平面を横切って前記超音波エネルギのエコーを受信するように位置されている超音波トランシーバと、
前記受信されたエコーを信号処理し、前記複数の走査平面を横切って検出された信号を特徴付けし、走査される走査平面の利用可能性の割合が走査平面から受信されたエコーに基づいて計算される処理装置と、
複数の走査平面に含まれる問題とする領域の前記利用可能性の割合の可視的描写を提示するように構成されているディスプレイと、
前記利用可能性の割合の前記可視的描写に基づいて前記超音波トランシーバの位置付け情報を提示するように構成されているディスプレイとを具備しているシステム。 - 前記処理装置は、複数の走査線の前記計算された利用可能性の割合が75−100%の利用可能性である問題とする領域の方向に前記超音波トランシーバを位置させるようにユーザを誘導する請求項1記載のシステム。
- 前記処理装置はCモードコンポーネント、Bモードコンポーネント、Aモードコンポーネントのうちの少なくとも1つを含んでいる請求項1記載のシステム。
- 腹部大動脈瘤評価および腹部大動脈の問題とする領域を監視するためのシステムにおいて、
3次元の超音波走査情報を得るために、超音波エネルギを送出し、複数の走査平面を横切って前記超音波エネルギのエコーを受信する少なくとも1つの超音波トランシーバを具備するハンドヘルドデータ収集装置と、
前記腹部大動脈の第1の測定された位置で前記超音波トランシーバから受信された位置付け情報を指示し、前記第1の測定された位置の利用可能性の計算された割合の可視的指示を行うディスプレイ手段と、
前記計算された利用可能性の割合に基づいて、前記大動脈の問題とする領域にわたって前期超音波トランシーバを位置付けるようにユーザを誘導する誘導手段と、
前記トランシーバから得られた問題とする領域についての前記受信された操作平面情報を変換するためのプロセッサと、
前記変換された走査平面情報から大動脈の体積情報を決定するためのプロセッサと、
前記大動脈の体積情報から前記問題とする領域における前記大動脈の直径を計算するための計算回路とを具備しているシステム。 - 前記誘導手段は、複数の走査平面に含まれる前記計算された利用可能性の割合が75乃至100%の利用可能性である問題とする領域の方向に前記超音波トランシーバを位置付けるようにユーザを誘導する請求項4記載のシステム。
- 腹部大動脈瘤を検出し測定する方法において、
前記腹部大動脈へ超音波エネルギを送信し、
前記腹部大動脈から反射された超音波エコーを収集し、
前記超音波エコーから信号を発生し、
前記発生された信号から基本信号を識別し、
基本信号用に設計されたアルゴリズムを使用して前記基本信号を処理し、
前記腹部大動脈の問題とする領域の画像を提示し、
前記腹部大動脈の前記体積を計算し、
前記腹部大動脈の前記計算された体積から前記腹部大動脈の直径を計算するステップを含んでいる方法。 - 前記誘導手段は、前記腹部大動脈の前記体積を測定するため少なくとも1つの位置へ前記超音波トランシーバを位置付けるようにユーザを誘導する請求項6記載の方法。
- 腹部大動脈瘤を検出し測定する方法を実行するための指令を有するコンピュータの読取り可能な媒体において、
前記腹部大動脈へ超音波エネルギを送信し、
前記腹部大動脈から反射された超音波エコーを収集し、
前記超音波エコーから信号を発生し、
前記発生された信号から基本信号を識別し、
基本信号用に設計されたアルゴリズムを使用して前記基本信号を処理し、
前記腹部大動脈の画像を提示し、
前記腹部大動脈の前記体積の測定を計算し、
前記腹部大動脈の前記計算された体積から前記腹部大動脈の前記直径の測定を計算するステップを含んでいるコンピュータの読取り可能な媒体。 - 前記コンピュータの読取り可能な媒体はさらに、
利用可能ではない領域と利用可能な領域から反射された基本信号を比較し、利用可能性の割合を計算し、
前記計算された利用可能性の割合に基づいて、利用可能ではない領域と利用可能な領域の画像をユーザに提示し、
超音波送信装置の位置をユーザに指示し、それにおいて前記利用可能性の割合は最大にされるステップを実行する指令を具備している請求項8記載のコンピュータの読取り可能な媒体。
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CA2957778C (en) | 2022-12-13 |
US20100036242A1 (en) | 2010-02-11 |
CA2957778A1 (en) | 2010-02-11 |
EP2323559A1 (en) | 2011-05-25 |
EP2323559A4 (en) | 2016-09-21 |
CA2732997C (en) | 2017-03-14 |
WO2010017508A1 (en) | 2010-02-11 |
CA2732997A1 (en) | 2010-02-11 |
JP5658151B2 (ja) | 2015-01-21 |
US8133181B2 (en) | 2012-03-13 |
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