JP5367574B2 - X線ct装置および該方法 - Google Patents
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- 238000000034 method Methods 0.000 title description 5
- 238000007689 inspection Methods 0.000 claims description 59
- 239000002872 contrast media Substances 0.000 claims description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 50
- 238000010521 absorption reaction Methods 0.000 claims description 40
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 8
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- 229910052788 barium Inorganic materials 0.000 claims description 7
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Description
図1は、本発明の一実施形態におけるX線CT装置の構成を示すブロック図である。図1において、X線CT装置1は、X線照射部11と、X線測定部12と、処理部13と、画像記憶部14と、操作部15と、画像表示部16とを備えて構成される。
Versatile Disc Recordable)等の記録媒体との間でデータを書き込みおよび/または読み込みを行う装置であり、例えば、CD−RドライブやDVD−Rドライブ等である。
例えば、ヨウ素造影剤、バリウム造影剤および金造影剤等のX線造影剤のうちの例えば診断目的や診断部位に応じた適宜な造影剤が被検体Hに投与される。そして、ユーザによって操作部15から撮影開始の指示が入力されると、処理部13のシステム制御部131の制御によって、X線照射部11が制御され、X線照射部11からX線が被検体Hに向けて照射され、そして、X線測定部12が制御され、被検体Hを透過した透過X線がX線測定部12で測定される。すなわち、X線照射部11では、システム制御部13から制御信号が入力されると、電源制御回路113がX線電源回路112を制御することによって所定のタイミングで所定の電圧の電力がX線電源回路112からX線管111へ供給され、X線管111が被検体Hに向けてX線を照射する。被検体Hに向けて照射されたX線は、被検体Hを通過してX線測定部12に入射される。X線測定部12では、被検体Hを透過した透過X線がX線検出器121に入射され、透過X線がX線検出器121で検出される。X線検出器121からの検出出力は、前置増幅回路122および主増幅回路123で増幅され、AD変換回路124でAD変換される。AD変換回路124でAD変換されたディジタル出力は、積分回路125の第1および第2積分回路125−1、125−2にそれぞれ入力され、第1および第2積分回路125−1、125−2でそれぞれ積分され、処理部13に入力される。
次に、本発明の実施例およびその比較例について説明する。
X-ray contrast agent”,The British Journal of Radiology,79(2006),248-253」等に開示されている。
Claims (6)
- 被検体にX線を照射するX線照射部と、
前記被検体を介して前記X線照射部と対向し、前記被検体を透過した透過X線のうちの前記被検体の内部の検査対象物に応じた特定のエネルギ範囲における前記透過X線の個数を測定するX線測定部と、
前記X線測定部で測定した前記透過X線の個数に基づいて前記検査対象物の厚さを演算する厚さ演算部と、
前記厚さ演算部で演算された前記検査対象物の厚さに基づいてCT画像を再構成する画像再構成部とを備え、
前記検査対象物は、X線造影剤であり、
前記特定のエネルギ範囲は、前記X線造影剤のK吸収端上下に設定され、
前記厚さ演算部は、前記検査対象物のK吸収端よりも小さい所定のエネルギ範囲Φ1における透過X線の個数と、前記検査対象物のK吸収端よりも大きい所定のエネルギ範囲Φ2における透過X線の個数との比Φ1/Φ2から前記検査対象物の厚さtIを求め、
前記画像再構成部は、前記厚さ演算部で演算された前記検査対象物の厚さを投影データとして、前記投影データと所定の再構成関数とをコンボリューションし、この結果を逆投影することによって、前記被検体のCT画像を生成し、
比Φ1/Φ2は、エネルギ範囲En(n=1、2)のX線に対する前記検査対象物および水の平均減衰係数をそれぞれ上バー付きのμI(En)および上バー付きのμW(En)とし、前記検査対象物および水の厚さをtIおよびtwとする場合に、下記式であること
を特徴とするX線CT装置。
- 前記X線測定部は、前記被検体を透過した透過X線から付与されたエネルギによって電荷を発生する検出媒体と、前記検出媒体における前記透過X線の入射端からの距離が互いに異なる位置で、前記検出媒体に設置された複数の電極とを備えること
を特徴とする請求項1に記載のX線CT装置。 - 前記X線測定部は、前記被検体を透過した透過X線の進行方向に並べられた複数の検出媒体から成り、前記透過X線から付与されたエネルギによって個々の前記検出媒体において電荷を発生するとともに、前記検出媒体が前記透過X線の吸収体ともなるため、個々の前記検出媒体に前記透過X線が到達するまでに透過する吸収体の厚さが異なること
を特徴とする請求項1に記載のX線CT装置。 - 前記X線造影剤は、ヨウ素造影剤、バリウム造影剤および金造影剤のうちのいずれかであること
を特徴とする請求項1ないし請求項3のいずれか1項に記載のX線CT装置。 - 前記X線照射部は、X線をフィルタに透過させたフィルタX線を被検体に照射すること
を特徴とする請求項1ないし請求項4のいずれか1項に記載のX線CT装置。 - 生体を除く被検体にX線を照射するX線照射工程と、
前記被検体を透過した透過X線のうちの前記被検体の内部の検査対象物に応じた特定のエネルギ範囲における前記透過X線の個数を測定するX線測定工程と、
前記X線測定工程で測定した前記透過X線の個数に基づいて前記検査対象物の厚さを演算する厚さ演算工程と、
前記厚さ演算工程で演算された前記検査対象物の厚さに基づいてCT画像を再構成する画像再構成工程とを備え、
前記検査対象物は、X線造影剤であり、
前記特定のエネルギ範囲は、前記X線造影剤のK吸収端上下に設定され、
前記厚さ演算工程は、前記検査対象物のK吸収端よりも小さい所定のエネルギ範囲Φ1における透過X線の個数と、前記検査対象物のK吸収端よりも大きい所定のエネルギ範囲Φ2における透過X線の個数との比Φ1/Φ2から前記検査対象物の厚さtIを求め、
前記画像再構成工程は、前記厚さ演算工程で演算された前記検査対象物の厚さを投影データとして、前記投影データと所定の再構成関数とをコンボリューションし、この結果を逆投影することによって、前記被検体のCT画像を生成し、
比Φ1/Φ2は、エネルギ範囲En(n=1、2)のX線に対する前記検査対象物および水の平均減衰係数をそれぞれ上バー付きのμI(En)および上バー付きのμW(En)とし、前記検査対象物および水の厚さをtIおよびtwとする場合に、下記式であること
を特徴とするX線CT方法。
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US20140072108A1 (en) * | 2010-07-16 | 2014-03-13 | David P. Rohler | Methods and apparatus for extended low contrast detectability for radiographic imaging systems |
GB201004121D0 (en) | 2010-03-12 | 2010-04-28 | Durham Scient Crystals Ltd | Detector device, inspection apparatus and method |
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CN105142526A (zh) * | 2013-04-16 | 2015-12-09 | 株式会社东芝 | X射线ct装置 |
JP6234708B2 (ja) * | 2013-05-28 | 2017-11-22 | 東芝メディカルシステムズ株式会社 | X線診断装置、医用画像処理装置及び医用画像処理プログラム |
JP6305692B2 (ja) | 2013-05-28 | 2018-04-04 | キヤノンメディカルシステムズ株式会社 | X線診断装置 |
US8965095B2 (en) * | 2013-05-30 | 2015-02-24 | Kabushiki Kaisha Toshiba | Noise balance pre-reconstruction data decomposition in spectral CT |
JP6595154B2 (ja) * | 2013-06-12 | 2019-10-23 | キヤノンメディカルシステムズ株式会社 | X線ctを用いた画像診断装置 |
KR20170129842A (ko) * | 2015-03-18 | 2017-11-27 | 프리스매틱 센서즈 에이비 | 광자-계수 멀티 빈 검출기로부터의 에너지 분해 영상 데이터에 기반한 영상 재구성 (image reconstruction based on energy-resolved image data from a photon-counting multi bin detector) |
JP7202302B2 (ja) * | 2017-01-05 | 2023-01-11 | ゼネラル・エレクトリック・カンパニイ | 断層撮影再構成に使用するためのデータのディープラーニングに基づく推定 |
EP3547254A1 (de) | 2018-03-29 | 2019-10-02 | Siemens Healthcare GmbH | Analyse-verfahren und analyseeinheit zur ermittlung radiologischer ergebnisdaten |
CN112666194B (zh) * | 2020-12-22 | 2022-12-20 | 上海培云教育科技有限公司 | 一种虚拟数字dr图像的生成方法及dr虚拟仿真仪器 |
KR102593937B1 (ko) * | 2021-08-23 | 2023-10-25 | (주)에이트마진 | 방사선 저감 필터의 제조 방법 |
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Cited By (2)
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US10451568B2 (en) | 2014-08-22 | 2019-10-22 | Canon Medical Systems Corporation | Photon counting X-ray CT apparatus |
US11327031B2 (en) | 2014-08-22 | 2022-05-10 | Canon Medical Systems Corporation | Photon counting X-ray CT apparatus |
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US20110194668A1 (en) | 2011-08-11 |
CN102215754B (zh) | 2013-06-05 |
CN102215754A (zh) | 2011-10-12 |
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EP2189115A1 (en) | 2010-05-26 |
EP2189115A4 (en) | 2010-08-18 |
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