JP2022002073A - 脳組織病変分布予測方法、その装置及びそのコンピュータプログラム - Google Patents
脳組織病変分布予測方法、その装置及びそのコンピュータプログラム Download PDFInfo
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Abstract
Description
本発明の実施形態によれば、治療前後の脳映像データを基に、成功予測モデル及び失敗予測モデルを別個に学習させ、2つの予測モデルを利用し、対象者の治療前データから、治療に成功したり失敗したりした場合、病変分布及びその容量を比較予測することにより、治療方針を決定する基準を提供することができる。
それにより、対象者に対する脳梗塞治療の成功率及び安全性を高めることができる。
また、実際治療成功/失敗事例データで学習された予測モデルを介し、映像データだけでも、正確であって直観的な病変分布及びその容量に係わる予測情報を提供することができる。対象者(患者)または保護者に、治療方針決定について視覚的な情報/根拠を介して診断することができるという利点がある。
ある実施形態が異なって具現可能である場合、特定段階は、説明される順序と異なるようにも遂行される。例えば、連続して説明される2つの段階は、実質的に同時にお遂行され、説明される順序と反対の順序にも遂行される。
以下、添付された図面を参照し、本発明の実施形態について詳細に説明するが、図面を参照して説明するとき、同一であるか、あるいは対応する構成要素は、同一図面符号を付し、それに係わる重複説明は、省略する。
血管再開通いかんを決定するための尺度として使用される指標として、mTICI(modified treatment in cerebral infarction)指標がある。mTICI指標は、順次に、0、1、2a、2b、3の値を有することができる。本開示の成功予測モデルSRは、mTICI指標が、2b、3(mTICI≧2b)である既患者のデータを基に学習され、失敗予測モデルURは、mTICI指標が、0、1、2a(mTICI≦2a)である既患者のデータを基にも学習されうる。
[数1]
C(t)=−1/(r2・TE)・log(S(t)/S0)
[数2]
rTTP(x,y)=TTP(x,y)−median(正常部位のTTP)
図7を参照すれば、本開示の病変分布予測に使用される脳映像データとして、第1 DWIデータ(治療前DWIデータ)、治療前PWIデータ及び第2 DWIデータ(治療後DWIデータ)が図示されている。
まず、事例A(失敗、梗塞成長も大きい場合)について説明する。事例Aの治療前後のDWIデータを比較説明すれば、第1 DWIデータにおいて、治療前病変容量は、4mlであり、第2 DWIデータにおいて、治療後病変容量は、243mlであり、梗塞成長(または、病変成長)(infarct growth)が約240mlと、大きい場合に該当する。
100 制御部
110 データ学習部
120 データ認識部
200 出力部
C_LS 対称領域
LS 関心領域
SR 成功予測モデル
UR 失敗予測モデル
Claims (15)
- 複数の既患者の脳映像データを利用し、対象者の脳組織病変分布を予測する予測モデルを学習させるモデル学習段階と、
前記対象者の脳映像データから入力データを獲得する入力獲得段階と、
前記入力データを、前記予測モデルに入力する入力段階と、
前記予測モデルを利用し、前記対象者に対する再開通治療後の前記病変分布に係わる情報を含む出力映像データを生成する出力段階と、を含み、
前記予測モデルは、
複数の既患者のうち、再開通治療に成功した患者の脳映像データを利用して学習される成功予測モデル、及び前記複数の既患者のうち、再開通治療に失敗した患者の脳映像データを利用して学習される失敗予測モデルを含む、脳組織病変分布予測方法。 - 前記モデル学習段階は、
複数の既患者それぞれの互いに異なる種類の脳映像データを整合する映像整合段階と、
前記脳映像データから変形データを計算し、前記病変部位に対応する関心領域を選択する段階と、
前記関心領域に対し、ボクセル別に、病変該当いかんにより、既設定の値にラベリングする段階と、
前記関心領域に対し、ボクセル別に、前記変形データを抽出し、学習用入力データを獲得する学習用入力獲得段階と、を含む、請求項1に記載の脳組織病変分布予測方法。 - 前記映像整合段階で整合される脳映像データは、
治療前に獲得された第1拡散強調映像(DWI)データ、治療前の貫流強調映像(PWI)データ、及び治療後に獲得された第2拡散強調映像(DWI)データを含む、請求項2に記載の脳組織病変分布予測方法。 - 前記計算して選択する段階は、
前記第1拡散強調映像(DWI)データから、見掛け拡散係数(ADC)を計算する段階と、
前記治療前の貫流強調映像(PWI)データから、rTTP(relative time to peak)を計算し、rTTPマップを獲得する段階と、
前記第1拡散強調映像(DWI)データ、前記治療前の貫流強調映像(PWI)データ及び前記第2拡散強調映像(DWI)データから、関心領域を選択する段階と、を含む、請求項3に記載の脳組織病変分布予測方法。 - 前記モデル学習段階は、
前記脳映像データから、正常部位に対応する対称領域を選択する段階と、
前記対称領域に対し、ボクセル別に、前記変形データを抽出し、学習用入力データを獲得する段階と、をさらに含み、
前記対称領域は、第1拡散強調映像(DWI)データ、治療前の貫流強調映像(PWI)データについて選択される、請求項3に記載の脳組織病変分布予測方法。 - 前記出力段階は、
前記入力データを、前記失敗予測モデルに入力し、前記対象者に対する再開通治療失敗後の病変分布に係わる情報を含む第1出力映像データを生成する第1出力段階と、
前記入力データを、前記成功予測モデルに入力し、前記対象者に対する再開通治療成功後の病変分布に係わる情報を含む第2出力映像データを生成する第2出力段階と、を含む、請求項1に記載の脳組織病変分布予測方法。 - 前記出力段階は、
前記第1出力映像データ及び前記第2出力映像データを比較し、再開通治療いかんを決定する段階をさらに含む、請求項6に記載の脳組織病変分布予測方法。 - 対象者の治療後の脳組織病変分布を予測する装置において、前記装置は、制御部及び出力部を含み、
前記制御部は、
複数の既患者の脳映像データを利用し、対象者の脳組織病変分布を予測する予測モデルを学習させ、
前記対象者の脳映像データから入力データを獲得し、
前記入力データを、前記予測モデルに入力し、
前記出力部は、前記予測モデルを利用し、前記対象者に対する再開通治療後の前記病変分布に係わる情報を含む出力映像データを生成し、
前記予測モデルは、
複数の既患者のうち、再開通治療に成功した患者の脳映像データを利用して学習される成功予測モデル、及び前記複数の既患者のうち、再開通治療に失敗した患者の脳映像データを利用して学習される失敗予測モデルを含む、脳組織病変分布予測装置。 - 前記制御部は、
複数の既患者それぞれの互いに異なる種類の脳映像データを整合し、
前記脳映像データから変形データを計算し、前記病変部位に対応する関心領域を選択し、
前記関心領域に対し、ボクセル別に、病変該当いかんにより、既設定の値にラベリングし、
前記関心領域に対し、ボクセル別に、前記変形データを抽出し、学習用入力データを獲得する、請求項8に記載の脳組織病変分布予測装置。 - 整合される前記脳映像データは、
治療前に獲得された第1拡散強調映像(DWI)データ、治療前の貫流強調映像(PWI)データ、及び治療後に獲得された第2拡散強調映像(DWI)データを含む、請求項9に記載の脳組織病変分布予測装置。 - 前記制御部は、
前記第1拡散強調映像(DWI)データから、見掛け拡散係数(ADC)を計算し、
前記治療前の貫流強調映像(PWI)データから、rTTP(relative time to peak)を計算し、rTTPマップを獲得し、
前記第1拡散強調映像(DWI)データ、前記治療前の貫流強調映像(PWI)データ及び前記第2拡散強調映像(DWI)データから、関心領域を選択する、請求項10に記載の脳組織病変分布予測装置。 - 前記制御部は、
前記脳映像データから、正常部位に対応する対称領域を選択し、
前記対称領域に対し、ボクセル別に、前記変形データを抽出し、学習用入力データを獲得し、
前記対称領域は、第1拡散強調映像(DWI)データ、治療前の貫流強調映像(PWI)データについて選択される、請求項10に記載の脳組織病変分布予測装置。 - 前記出力部は、
前記失敗予測モデルに入力された前記入力データに基づき、前記対象者に対する再開通治療失敗後の病変分布に係わる情報を含む第1出力映像データを生成し、
前記成功予測モデルに入力された前記入力データに基づき、前記対象者に対する再開通治療成功後の病変分布に係わる情報を含む第2出力映像データを生成する、請求項8に記載の脳組織病変分布予測装置。 - 前記出力部は、
前記第1出力映像データ及び前記第2出力映像データを比較し、前記対象者に対する再開通治療いかんを決定する、請求項13に記載の脳組織病変分布予測装置。 - コンピュータを利用し、請求項8ないし14のうちいずれか1項に記載の方法を実行するために媒体に保存されたコンピュータプログラム。
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