JP7416652B2 - 磁気共鳴イメージング装置、画像処理装置及びプログラム - Google Patents
磁気共鳴イメージング装置、画像処理装置及びプログラム Download PDFInfo
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Description
540 MRIシーケンスコントローラ
542 MRIデータプロセッサ
Claims (14)
- パルスシーケンスを実行して磁気共鳴データを取得するシーケンス制御部と、
前記磁気共鳴データに基づいて得られた第1の画像に対してマルチスケール変換を適用して、複数のサブバンドに係るデータとして、前記複数のサブバンドそれぞれについての変換係数を算出し、前記変換係数のうち少なくとも一つに基づいてしきい値を算出する算出部と、
前記しきい値に応じて定められた正則化パラメータを乗じた正則化項を含んで目的関数を最小化することにより、前記磁気共鳴データから第2の画像を生成する生成部とを備える、
磁気共鳴イメージング装置。 - 前記算出部は、前記変換係数のヒストグラムに基づく方法により、前記しきい値を算出する、請求項1に記載の磁気共鳴イメージング装置。
- 前記マルチスケール変換は、ウェーブレット変換、カーブレット変換、ガウシアンピラミッド変換、ラプラシアンピラミッド変換、ステアラブルピラミッド変換、ガボール変換、ブロック離散コサイン変換、ブロック離散フーリエ変換又はハール変換である、請求項1に記載の磁気共鳴イメージング装置。
- 前記算出部は、前記磁気共鳴データにより得られたデータにゼロフィリングを行ったk空間データを逆投影することにより前記第1の画像を生成し、
前記マルチスケール変換はウェーブレット変換であり、
前記算出部は、前記複数のサブバンドのうち最も細かいスケールに対応するサブバンドのヒストグラムに基づいて、前記しきい値を算出する、請求項1に記載の磁気共鳴イメージング装置。 - 前記正則化項は、前記第2の画像に前記ウェーブレット変換を行った時のl1ノルムであり、前記正則化パラメータは、前記ヒストグラムの所定のパーセンタイル値に基づいて定められる、請求項4に記載の磁気共鳴イメージング装置。
- 前記正則化項は、前記複数のサブバンドそれぞれに対応する複数の正則化項からなり、
前記算出部は、前記複数のサブバンドそれぞれごとに、前記しきい値を算出し、前記複数の正則化項それぞれの正則化パラメータを、前記複数のサブバンドそれぞれごとに定められた前記しきい値を用いて算出する、請求項1に記載の磁気共鳴イメージング装置。 - 前記正則化項は、l1ノルムを用いた項である、請求項1に記載の磁気共鳴イメージング装置。
- 前記シーケンス制御部は、ノイズレベルを算出するための較正スキャンを更に実行し、
前記算出部は、前記較正スキャンに基づいて、前記しきい値を算出する、請求項1に記載の磁気共鳴イメージング装置。 - 前記正則化項は、2つのサブバンドそれぞれに対応する2つの正則化項からなり、
前記算出部は、前記2つのサブバンドそれぞれごとに、前記しきい値を算出し、前記2つの正則化項それぞれの正則化パラメータを、前記2つのサブバンドそれぞれごとに定められた前記しきい値を用いて算出する、請求項1に記載の磁気共鳴イメージング装置。
- パルスシーケンスを実行して取得された磁気共鳴データに基づいて得られた第1の画像に対してマルチスケール変換を適用して、複数のサブバンドに係るデータとして、前記複数のサブバンドそれぞれについての変換係数を算出し、前記変換係数のうち少なくとも一つに基づいてしきい値を算出する算出部と、
前記しきい値に応じて定められた正則化パラメータを乗じた正則化項を含んで目的関数を最小化することにより、前記磁気共鳴データから第2の画像を生成する生成部とを備える、
画像処理装置。 - パルスシーケンスを実行して取得された磁気共鳴データに基づいて得られた第1の画像に対してマルチスケール変換を適用して、複数のサブバンドに係るデータとして、前記複数のサブバンドそれぞれについての変換係数を算出し、
前記変換係数のうち少なくとも一つに基づいてしきい値を算出し、
前記しきい値に応じて定められた正則化パラメータを乗じた正則化項を含んで目的関数を最小化することにより、前記磁気共鳴データから第2の画像を生成する処理を、
コンピュータに実行させるプログラム。 - パルスシーケンスを実行して磁気共鳴データを取得するシーケンス制御部と、
前記磁気共鳴データに基づいて得られた第1の画像に対して、クラスタリングに基づくしきい値決定法、大津の方法、k平均クラスタリング法、混合分布モデルに基づく方法、のうち少なくとも一つに基づいてしきい値を算出する算出部と、
前記しきい値に応じて定められた正則化パラメータを乗じた正則化項を含んで目的関数を最小化することにより、前記磁気共鳴データから第2の画像を生成する生成部とを備える、
磁気共鳴イメージング装置。 - パルスシーケンスを実行して磁気共鳴データを取得するシーケンス制御部と、
前記磁気共鳴データに基づいて得られた第1の画像に対して、クラスタリングに基づくしきい値決定法、大津の方法、k平均クラスタリング法、混合分布モデルに基づく方法、のうち少なくとも一つに基づいてしきい値を算出する算出部と、
前記しきい値に応じて定められた正則化パラメータを乗じた正則化項を含んで目的関数を最小化することにより、前記磁気共鳴データから第2の画像を生成する生成部とを備える、
画像処理装置。 - パルスシーケンスを実行して取得された磁気共鳴データに基づいて得られた第1の画像に対してクラスタリングに基づくしきい値決定法、大津の方法、k平均クラスタリング法、混合分布モデルに基づく方法のうち少なくとも一つに基づいてしきい値を算出し、
前記しきい値に応じて定められた正則化パラメータを乗じた正則化項を含んで目的関数を最小化することにより、前記磁気共鳴データから第2の画像を生成する処理を、
コンピュータに実行させるプログラム。
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