JP7607671B2 - 医療用画像の異常検出システム及び異常検出方法 - Google Patents
医療用画像の異常検出システム及び異常検出方法 Download PDFInfo
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Description
20 撮影装置
30 画像サーバ
31a、31b、32a、32b 医療用画像
40 ビューワ装置
50 異常検出システム
51 ブロック情報生成部
52 取得部
53 判定部
54 画像処理部
60、60a~60f、70a~70f ブロック
Claims (10)
- 医療用画像に基づいて前記医療用画像に含まれる予め特定された一の解剖学的構造物であって本来一つのブロックとして検出されるべき解剖学的構造物についての異常の有無を検出する異常検出システムであって、
前記異常には、医療用画像において臓器の正常な構造の一部に腫瘍及び水を含む他の異常物が重なっているケースが含まれ、
前記異常検出システムは、
前記医療用画像において前記解剖学的構造物を示す画素が繋がった領域であるブロックを示すブロック情報を取得する取得部と、
前記取得部が取得した前記ブロック情報が示すブロックの数に基づいて前記ケースによる異常であるか否かを判定して出力する判定部とを備え、
前記判定部は、前記ブロック情報が示すブロックの数が1である場合に、前記ケースによる異常でないと判定し、前記ブロック情報が示すブロックの数が2以上である場合に、前記ブロック情報が示すブロックが所定の条件を満たすときに、前記ケースによる異常であると判定する、
異常検出システム。 - 前記所定の条件は、前記ブロック情報が示す2以上のブロックのうち、前記医療用画像における面積が2番目に大きいブロックに関する条件である、
請求項1記載の異常検出システム。 - 前記所定の条件は、前記ブロック情報が示す2以上のブロックのうち、前記医療用画像における面積が2番目に大きいブロックが第1閾値以上の面積を有することである、
請求項2記載の異常検出システム。 - 前記所定の条件は、前記ブロック情報が示す2以上のブロックのうち、前記医療用画像における面積が最も大きいブロックと他のブロックのそれぞれとの前記医療用画像における距離のうちの最小値が第2閾値以下であることである、
請求項1記載の異常検出システム。 - 前記所定の条件は、さらに、前記ブロック情報が示す2以上のブロックのうち、前記医療用画像における面積が2番目に大きいブロックが第1閾値以上の面積を有することである、
請求項4記載の異常検出システム。 - 前記第1閾値は、様々な前記面積について予め得られる、前記解剖学的構造物の異常と正常とを区別するためのROC曲線(receiver operating characteristic curve)に依
存して定まる値である、
請求項3又は5記載の異常検出システム。 - 前記第2閾値は、様々な前記距離について予め得られる、前記解剖学的構造物の異常と正常とを区別するためのROC曲線に依存して定まる値である、
請求項4記載の異常検出システム。 - 医療用画像に基づいて前記医療用画像に含まれる予め特定された一の解剖学的構造物であって本来一つのブロックとして検出されるべき解剖学的構造物についての異常の有無を検出する異常検出システムによる異常検出方法であって、
前記異常には、医療用画像において臓器の正常な構造の一部に腫瘍及び水を含む他の異常物が重なっているケースが含まれ、
前記異常検出方法は、
前記医療用画像において前記解剖学的構造物を示す画素が繋がった領域であるブロックを示すブロック情報を取得する取得ステップと、
前記取得ステップで取得した前記ブロック情報が示すブロックの数に基づいて前記ケースによる異常であるか否かを判定して出力する判定ステップとを含み、
前記判定ステップでは、前記ブロック情報が示すブロックの数が1である場合に、前記ケースによる異常でないと判定し、前記ブロック情報が示すブロックの数が2以上である場合に、前記ブロック情報が示すブロックが所定の条件を満たすときに、前記ケースによる異常であると判定する、
異常検出方法。 - さらに、前記解剖学的構造物の異常と正常とを区別するためのROC曲線を取得し、取得した前記ROC曲線に基づいて、前記所定の条件を決定する決定ステップを含む、
請求項8記載の異常検出方法。 - 前記解剖学的構造物は、左室、右房、下行大動脈、又は、横隔膜である、
請求項1~7のいずれか1項に記載の異常検出システム。
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| JP2020195390 | 2020-11-25 | ||
| JP2020195390 | 2020-11-25 | ||
| PCT/JP2021/041902 WO2022113801A1 (ja) | 2020-11-25 | 2021-11-15 | 医療用画像の異常検出システム及び異常検出方法 |
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| US (1) | US12437400B2 (ja) |
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- 2021-11-15 CN CN202180077325.8A patent/CN116490130A/zh active Pending
- 2021-11-15 WO PCT/JP2021/041902 patent/WO2022113801A1/ja not_active Ceased
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| JPWO2022113801A1 (ja) | 2022-06-02 |
| US12437400B2 (en) | 2025-10-07 |
| EP4252657A4 (en) | 2024-01-24 |
| CN116490130A (zh) | 2023-07-25 |
| WO2022113801A1 (ja) | 2022-06-02 |
| EP4252657A1 (en) | 2023-10-04 |
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