JP6917356B2 - 主成分材料組み合わせによる分解方法および装置 - Google Patents
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Description
本開示は、2017年12月26日に出願された中国特許出願第201711432840.5号に基づき、その優先権を主張するものである。この出願の開示は、ここにその全体を参照援用する。
[技術分野]
本開示は放射線イメージングの分野に関し、特に、主成分材料組み合わせに基づく分解方法および分解装置に関する。
本開示のもう1つの態様は、コンピュータプログラムを記憶するコンピュータ可読記憶媒体であって、前記コンピュータプログラムがプロセッサにより実行され、実施形態の方法を実施する、コンピュータ可読記憶媒体を含む。
Claims (9)
- 主成分材料の組み合わせに基づく分解方法であって、
マルチエネルギーCTによりスキャンされるスキャン対象の各点の分解係数と等価原子番号とを取得する取得ステップであって、前記点はピクセル点またはボクセル点である取得ステップと、
前記スキャン対象の各点の等価原子番号にしたがって、前記スキャン対象を複数の領域に分割する領域分割ステップであって、分割領域の各々で用いられる主成分材料の組み合わせは互いに異なるステップと、
各分割領域について、前記領域で用いられる前記主成分材料の組み合わせに基づいて、前記領域中の各点の分解係数を決定する分解係数決定ステップと、
すべての分割領域のすべての点の分解係数に基づく分解係数の変化が所定閾値より小さくない場合、前記分割領域中のすべての点の決定された分解係数と、前記分割領域中で用いられる前記主成分材料の組み合わせのすべての主成分材料の原子情報とに基づいて、前記分割領域の各々について、前記分割領域中のすべての点の等価原子番号を決定する等価原子番号決定ステップと、
全分割領域中のすべての点の分解係数に基づいて分解係数の変化が所定閾値より小さくなるまで、前記領域分割ステップと、前記分解係数決定ステップと、等価原子番号決定ステップとをループするステップと、
を含む方法。 - 前記領域分割ステップは、
所定の原子番号関係チェーンにおける前記スキャン対象の各点の等価原子番号の位置を決定するステップであって、前記原子番号関係チェーンの同じ副区間にある各点に対応する前記スキャン対象のすべての点を、1つの領域とし、副区間の両端の原子番号に対応する材料が、その領域の主成分材料の組み合わせを構成する主成分材料と決定されるステップを含み、
前記原子番号関係チェーンは複数の原子番号よりなる関係チェーンであって、前記原子番号関係チェーンは境界として複数の原子番号を有する複数の副区間に分割される、
請求項1に記載の方法。 - 前記分解係数決定ステップは、各分割領域について、
前記マルチエネルギーCTの光源により放射される様々なエネルギーの光線の投影データと、前記領域の光線のエネルギースペクトルと、前記領域の主成分材料の組み合わせに対応する減衰係数関数とにしたがって、各光線が通過する各経路に沿って、前記領域の各点の分解係数の積分を計算することと、
各光線が通過する各経路に沿って、前記領域の各点の分解係数の積分にしたがって、前記領域の各点の分解係数を決定することとを含む、
請求項1に記載の方法。 - 前記領域の光線のエネルギースペクトルは、前記マルチエネルギーCTの光源のエネルギースペクトルと、前記領域の外の他の領域のすべての点の分解係数と、前記他の領域の主成分材料の組み合わせに対応する減衰係数関数とにしたがって決定される、
請求項3に記載の方法。 - 前記等価原子番号決定ステップは、
前記領域の各点の分解係数と、前記領域の主成分材料の組み合わせのすべての主成分材料の原子番号と原子量とにしたがって、分割領域の各点の等価電子密度を決定することと、
前記領域の各点の分解係数及び等価電子密度と、前記領域の主成分材料の組み合わせのすべての主成分材料の原子番号及び原子量とにしたがって、前記領域の各点の等価原子番号を決定することとを含む、
請求項1に記載の方法。 - 前記取得ステップは、所定の主成分材料組み合わせに応じて、スキャン対象の全ての点の分解係数と等価原子番号とを取得する、
請求項1に記載の方法。 - 分解係数の変化が所定閾値より小さい場合、前記領域の各点の等価原子番号を用いて、各分割領域の物質識別を実行する、
請求項1に記載の方法。 - 主成分材料の組み合わせに基づく分解装置であって、
メモリと、
前記メモリに結合したプロセッサであって、前記メモリに記憶された命令に基づいて、請求項1ないし7いずれか一項に記載の方法を実行するように構成されたプロセッサとを有する、
分解装置。 - コンピュータプログラムを記憶するコンピュータ可読記憶媒体であって、前記コンピュータプログラムがプロセッサにより実行され、請求項1ないし7いずれか一項に記載の方法を実施する、コンピュータ可読記憶媒体。
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