JP2021112567A - 放射線画像処理方法及び放射線画像診断装置 - Google Patents
放射線画像処理方法及び放射線画像診断装置 Download PDFInfo
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Abstract
Description
本研究で報告された高速検出器は、0.75mm厚CdTe直接検出層、二重エネルギーしきい値化、電荷共有補正および1000fpsまでのフレームレートを有する直接光子計数検出器(Actaeon、XCounter社、ダンデリード、スウェーデン)であった。これは、100μmの画素ピッチ、1インチ×1インチのアクティブエリア、256画素×256画素の読み出しを有し、各画素上に2つの独立したしきい値を有するデュアルエネルギー取得が可能である。
本明細書で使用される高速検出器は、Actaeon検出器(XCounter社、ダンデリード、スウェーデン)である。Actaeon検出器は、100μpピッチおよび256×256マトリックスサイズの単光子計数直接CaTe検出器(single photon-counting direct CaTe detector)であり、1000fpsまでの取得速度が可能である。
964 処理回路
Claims (24)
- 所定のフレームレートで、放射線不透過性媒体の血管内投与部位の下流にある血管の関心領域の2次元投影画像を取得し、
前記2次元投影画像内で、前記放射線不透過性媒体の不均一性を識別し、
前記不均一性の空間的な動きに基づいて、前記血管内における血流の動的血管パラメータを決定すること
を含む、放射線画像処理方法。 - 患者の心臓信号に基づいて前記患者の心周期のタイミングを決定し、
前記放射線不透過性媒体の血管内投与を前記心周期の前記決定されたタイミングと同期させ、
前記2次元投影画像の取得を、前記心周期の前記決定されたタイミングと同期させること
を更に含む、請求項1に記載の放射線画像処理方法。 - 前記放射線不透過性媒体の血管内投与は、断続的に行なわれる、請求項2に記載の放射線画像処理方法。
- 前記放射線不透過性媒体の血管内投与は、前記放射線不透過性媒体の量を変化させながら行なわれる、請求項2に記載の放射線画像処理方法。
- 前記心周期の前記決定されたタイミングは、前記心周期の位相に基づく、請求項2〜4のいずれか一項に記載の放射線画像処理方法。
- 前記所定のフレームレートは、100fpsより大きい、請求項1〜5のいずれか一項に記載の放射線画像処理方法。
- 前記2次元投影画像を、一連の連続2次元投影画像として取得する、請求項1〜6のいずれか一項に記載の放射線画像処理方法。
- 前記動的血管パラメータは、流線および速度分布を含む、請求項1〜7のいずれか一項に記載の放射線画像処理方法。
- 前記放射線不透過性媒体は、球状粒子であり、
前記不均一性は、前記球状粒子によって生じる、請求項1〜8のいずれか一項に記載の放射線画像処理方法。 - 前記球状粒子は、生分解性である、請求項9に記載の放射線画像処理方法。
- バイプレーン放射線検出器を介して複数方向の前記2次元投影画像を取得し、
複数方向の前記2次元投影画像のそれぞれにおいて前記不均一性を識別し、
前記不均一性の3次元空間での動きに基づいて前記動的血管パラメータを決定する、請求項1〜10のいずれか一項に記載の放射線画像処理方法。 - 前記放射線不透過性媒体の血管内投与を同期させること、および前記2次元投影画像の取得を同期させることは、前記心周期の前記決定されたタイミングに基づく時間遅延を含む、請求項2〜4のいずれか一項に記載の放射線画像処理方法。
- 所定のフレームレートで、放射線不透過性媒体の血管内投与部位の下流にある血管の関心領域の2次元投影画像を取得する取得部と、
前記2次元投影画像内で、前記放射線不透過性媒体の不均一性を識別する識別部と、
前記不均一性の空間的な動きに基づいて、前記血管内における血流の動的血管パラメータを決定する決定部と
を備える、放射線画像診断装置。 - 前記取得部は、更に、
患者の心臓信号に基づいて前記患者の心周期のタイミングを決定し、
前記放射線不透過性媒体の血管内投与を前記心周期の前記決定されたタイミングと同期させ、
前記2次元投影画像の取得を、前記心周期の前記決定されたタイミングと同期させる、請求項13に記載の放射線画像診断装置。 - 前記放射線不透過性媒体の血管内投与は、断続的に行なわれる、請求項14に記載の放射線画像診断装置。
- 前記放射線不透過性媒体の血管内投与は、前記放射線不透過性媒体の量を変化させながら行なわれる、請求項14に記載の放射線画像診断装置。
- 前記心周期の前記決定されたタイミングは、前記心周期の位相に基づく、請求項14〜16のいずれか一項に記載の放射線画像診断装置。
- 前記所定のフレームレートは、100fpsより大きい、請求項13〜17のいずれか一項に記載の放射線画像診断装置。
- 前記取得部は、前記2次元投影画像を、一連の連続2次元投影画像として取得する、請求項13〜18のいずれか一項に記載の放射線画像診断装置。
- 前記動的血管パラメータは、流線および速度分布を含む、請求項13〜19のいずれか一項に記載の放射線画像診断装置。
- 前記不均一性は、球状粒子である前記放射線不透過性媒体によって生じる、請求項13〜20のいずれか一項に記載の放射線画像診断装置。
- 前記球状粒子は、生分解性である、請求項21に記載の放射線画像診断装置。
- 前記取得部は、バイプレーン放射線検出器を介して複数方向の前記2次元投影画像を取得し、
前記識別部は、複数方向の前記2次元投影画像のそれぞれにおいて前記不均一性を識別し、
前記決定部は、前記不均一性の3次元空間での動きに基づいて前記動的血管パラメータを決定する、請求項13〜22のいずれか一項に記載の放射線画像診断装置。 - 前記放射線不透過性媒体の血管内投与を同期させること、および前記2次元投影画像の取得を同期させることは、前記心周期の前記決定されたタイミングに基づく時間遅延を含む、請求項14〜16のいずれか一項に記載の放射線画像診断装置。
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