JP5384521B2 - 放射線撮像装置 - Google Patents
放射線撮像装置 Download PDFInfo
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- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
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- A61B6/032—Transmission computed tomography [CT]
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- A61B6/4429—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units
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- A61B6/4441—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units the source unit and the detector unit being coupled by a rigid structure the rigid structure being a C-arm or U-arm
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- A61B6/44—Constructional features of apparatus for radiation diagnosis
- A61B6/4429—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units
- A61B6/4464—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units the source unit or the detector unit being mounted to ceiling
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- A61B6/585—Calibration of detector units
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Description
以下、本発明を適用する第一の実施形態について説明する。以下、本発明の各実施形態を説明するための全図において、同一機能を有するものは同一符号を付し、その繰り返しの説明は省略する。
本発明を適用する第二の実施形態を説明する。本実施形態のX線撮像装置は基本的に第一の実施形態と同様の構成を有する。また、BH補正関数は第一の実施形態と同様である。しかし、SX補正関数が第一の実施形態と異なる。第一の実施形態では、透過率データと散乱X線強度とを対応づけ、SX補正関数としている。しかし、本実施形態では、透過率データと直接X線強度との関係を対応づけ、SX補正関数とする。
次に、本発明を適用する第三の実施形態について説明する。本実施形態のX線撮像装置は、基本的に上記各実施形態と同様の構成を有する。上記各実施形態では、散乱X線の補正およびビームハードニングによる影響の補正を、それぞれSX補正関数およびBH補正関数を用い、独立して補正している。しかし、本実施形態では、SX補正関数内に、ビームハードニングの補正も組み込む。これにより、計測データに対しSX補正関数により補正を行うだけで、散乱X線補正および散乱X線補正後の計測データに対するビームハードニング補正を実現する。以下、本実施形態について、上記各実施形態と異なる構成であるSX補正関数123およびSX補正関数123を用いる補正処理について説明する。
次に、本発明を適用する第四の実施形態について説明する。本実施形態のX線撮像装置は、基本的に上記各実施形態と同様の構成を有する。本実施形態においても、第三の実施形態同様、SX補正関数内に、ビームハードニングの補正も組み込み1回の変換処理で、散乱X線補正およびビームハードニング補正を実現する。ただし、第三の実施形態では、透過率データにおいて補正を行うが、本実施形態では、投影データに変換後、補正を行う。以下、本実施形態について、上記各実施形態と異なる構成であるSX補正関数124およびSX補正関数124を用いる補正処理について説明する。
次に、本発明を適用する第五の実施形態について説明する。本実施形態のX線撮像装置は、基本的に上記各実施形態と同様の構成を有する。本実施形態においても、第三および第四の実施形態同様、SX補正関数内にビームハードニング補正を組み込み、1回の変換処理で、散乱X線補正およびビームハードニング補正を実現する。ただし、本実施形態では、透過率データに、散乱X線補正とビームハードニング補正後の投影データを対応づけたものをSX補正関数とする。以下、本実施形態について、上記各実施形態と異なる構成であるSX補正関数125およびSX補正関数125を用いる補正処理について説明する。
Claims (6)
- 被写体に放射線を照射する放射線源と、
複数の画素を備え、前記画素毎の放射線量を検出する検出器と、
前記検出器が検出した前記画素毎の検出結果に対し、散乱放射線による影響を補正する散乱放射線補正関数と、前記補正後の検出結果に対しビームハードニングによる影響を補正するビームハードニング補正関数とを記憶する記憶手段と、
前記画素毎の検出結果を前記散乱放射線補正関数で補正するとともに、前記補正後の検出結果を前記ビームハードニング補正関数で補正する補正手段と、を備え、
前記ビームハードニング補正関数は、前記散乱放射線による影響を補正後の前記検出結果に応じてビームハードニングの補正値を返す関数であり、散乱放射線量を略0として透過距離を変化させながら模擬被写体を計測して得た検出結果を変換することにより得た投影データと、透過距離に応じたビームハードニング量を返す関数から算出した投影データとの関係を近似することにより得た原点を通る一次関数であり、
前記補正手段は、前記被写体を計測して得た検出結果を透過率データに変換し、当該透過率データを前記散乱放射線補正関数で補正後、投影データに変換し、変換後の当該投影データを、当該投影データに応じて前記ビームハードニング補正関数が返す前記補正値に置き換えることにより前記ビームハードニングの影響を補正すること
を特徴とする放射線撮像装置。 - 請求項1記載の放射線撮像装置であって、
前記被写体への照射放射線量を調整するコリメータをさらに備え、
前記コリメータは、当該コリメータが備える遮蔽板の幅であるコリメータ幅を変化させることにより、前記散乱放射線量を変化させ、
前記散乱放射線補正関数は、前記被写体計測時の散乱放射線量条件における検出結果から得た透過率データに応じた前記散乱放射線量を返す関数Sであり、
当該関数Sは、透過距離毎の、特定透過率データを第一の透過率データDから減算した差分値のプロット結果を以下の式で近似したものであり、
kは係数であり、
前記特定透過率データは、前記散乱放射線量が略0に相当する透過率データであり、
前記第一の透過率データは、前記被写体計測時の散乱放射線量条件におけるコリメータ幅に対応する透過率データであり、
前記透過距離毎の、前記特定透過率データおよび前記第一の透過率データは、コリメータ幅と透過率データとの関係を前記透過距離毎にプロットして得た第一の関数上でそれぞれ決定され、
前記第一の関数は、前記透過距離毎に、コリメータ幅を変えることにより前記散乱放射線量を変化させて前記模擬被写体を計測し、得られた前記コリメータ幅毎の透過率データを、前記コリメータ幅と前記透過率データとを軸とするグラフ上にプロットした結果を近似することにより得ること
を特徴とする放射線撮像装置。 - 請求項1記載の放射線撮像装置であって、
前記被写体への照射放射線量を調整するコリメータをさらに備え、
前記コリメータは、当該コリメータが備える遮蔽板の幅であるコリメータ幅を変化させることにより、前記散乱放射線量を変化させ、
前記散乱放射線補正関数は、前記被写体計測時の散乱放射線量条件における検出結果から得た透過率データに応じた前記散乱放射線量を返す関数S AVR であり、
当該関数S AVR は、透過距離毎の、特定平均透過率データを第一の平均透過率データDAVRから減算した差分値のプロット結果を以下の式で近似したものであり、
kは係数であり、
前記特定平均透過率データは、前記散乱放射線量が略0に相当する平均透過率データであり、
前記第一の平均透過率データは、前記被写体計測時の散乱放射線量条件におけるコリメータ幅に対応する平均透過率データであり、
前記透過距離毎の、前記特定平均透過率データおよび前記第一の平均透過率データは、コリメータ幅と透過率データとの関係を前記透過距離毎にプロットして得た第一の関数上でそれぞれ決定され、
前記第一の関数は、当該透過距離毎に、コリメータ幅を変えることにより前記散乱放射線量を変化させて前記模擬被写体の複数点を計測し、得られた前記コリメータ幅毎の前記複数点の透過率データの平均値を、前記コリメータ幅と前記透過率データとを軸とするグラフ上にプロットした結果を近似することにより得ること
を特徴とする放射線撮像装置。 - 請求項1記載の放射線撮像装置であって、
前記被写体への照射放射線量を調整するコリメータをさらに備え、
前記コリメータは、当該コリメータが備える遮蔽板の幅であるコリメータ幅を変化させることにより、前記散乱放射線量を変化させ、
前記散乱放射線補正関数は、前記被写体計測時の散乱放射線量条件における検出結果から得た透過率データに応じた散乱放射線による影響を補正後の透過率データを返す関数であり、透過距離毎の、特定透過率データと第一の透過率データとのプロット結果を近似することにより得、
前記特定透過率データは、前記散乱放射線量が略0に相当する透過率データであり、
前記第一の透過率データは、前記被写体計測時の散乱放射線量条件におけるコリメータ幅に対応する透過率データであり、
前記透過距離毎の、前記特定透過率データおよび前記第一の透過率データは、コリメータ幅と透過率との関係を前記透過距離毎にプロットして得た第一の関数上でそれぞれ決定され、
前記第一の関数は、当該透過距離毎に、コリメータ幅を変えることにより前記散乱放射線量を変化させて前記模擬被写体を計測し、得られた前記コリメータ幅毎の透過率データを、前記コリメータ幅と前記透過率データとを軸とするグラフ上にプロットした結果を近似することにより得ること
を特徴とする放射線撮像装置。 - 請求項1から4いずれか1項記載の放射線撮像装置であって、
前記散乱放射線補正関数および前記ビームハードニング補正関数の少なくとも一方を、前記検出結果から算出する補正関数算出手段をさらに備えること
を特徴とする放射線撮像装置。 - 請求項1から5いずれか1項記載の放射線撮像装置であって、
前記放射線源と前記検出器とを前記被写体に対して相対的に移動させる制御部と、
前記補正後の検出結果から画像を再構成する再構成処理部と、をさらに備え、
前記制御部は、前記放射線源と前記検出器とを前記被写体に対して相対的に回転させ、
前記再構成処理部は、前記補正後の検出結果を用いて再構成演算を行い、3次元像を取得すること
を特徴とする放射線撮像装置。
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| JP2010540473A JP5384521B2 (ja) | 2008-11-27 | 2009-11-24 | 放射線撮像装置 |
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| KR20170133450A (ko) * | 2015-10-23 | 2017-12-05 | 가부시키가이샤 죠부 | X선 장치, 데이터 처리 장치 및 데이터 처리 방법 |
| KR20200002918A (ko) * | 2017-06-20 | 2020-01-08 | 가부시키가이샤 죠부 | X선 장치, x선 검사 방법, 데이터 처리 장치, 데이터 처리 방법 및 컴퓨터 프로그램 |
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| KR102252847B1 (ko) | 2017-06-20 | 2021-05-14 | 가부시키가이샤 죠부 | X선 장치, x선 검사 방법, 데이터 처리 장치, 데이터 처리 방법 및 컴퓨터 프로그램 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2010061810A1 (ja) | 2012-04-26 |
| US20110235773A1 (en) | 2011-09-29 |
| WO2010061810A1 (ja) | 2010-06-03 |
| US8787520B2 (en) | 2014-07-22 |
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