JP5523686B2 - 高度に限定された医用画像におけるモーションアーチファクトの低減方法 - Google Patents
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Description
本出願は、2007年9月17日付で出願された、発明の名称が「高度に限定されたX線ラジオグラフ画像を作成する方法(Method for Producing Highly Constrained X-Ray Radiograph Images)」の米国特許仮出願第60/972,828号、および2008年1月25日付で出願された、発明の名称が「高度に限定された医用画像におけるモーションアーチファクトの低減方法(Method for Reducing Motion Artifacts in Highly Constrained Medical Images)」の米国特許仮出願第61/023,454号に基づく。
本発明は、米国国立衛生研究所によって認められた認可番号第EB006393に基づいて、政府の支援でなされた。米国政府は、本発明に一定の権利を有する。
本発明の分野は医用イメージングであり、特に、高度に限定された画像再構成法を用いて画像を作成する方法である。
合成画像は、走査中に取得されたデータから再構成され、フィールド・オブ・ビューで構造体を表す、他の取得画像データだけでなく画像フレームを再構成するために用いられる合成画像を含んでもよい。数式(2)の分子は、合成画像において、対応する信号値を用いた各画素に重み付けし、分母は、全逆投影信号サンプルが、画像フレームに対する投影総和を反映し、合成画像の総和により乗算されないように、その値を正規化している。
本発明は、走査中に対象の動きが生じるときにより高品質の合成画像を作成するためのHYPRプロセスの改善である。より詳細には、合成画像が、一連の取得画像フレームからデータを集積することによって作成され、取得データを集積するための画像フレームの数が、検出される対象の動きの特性および量によって決定される。
特に図4と図5を参照すると、蛍光透視法およびデジタル差分血管造影法を行うためにX線ラジオグラフ画像を取得するのに使用され得るX線システムが示されている。このシステムは、その両端部の一端にX線源アセンブリ12が、その他端にX線検出器アレイアセンブリ14が取り付けられているCアーム10を有するガントリーを特徴とする。ガントリーは、X線源12および検出器14を、テーブル16上に配置された患者の周囲で、異なる位置および角度に向けることを可能にすると同時に、医師が患者に接近して処置を行うことも可能にする。
それぞれのスライスのビュー角φもインターリーブされ、これは、各スライスにおける開始角を180°/スライス数だけインクリメントすることによって達成される。
Claims (11)
- 取得される現在の画像フレームから対象の画像を生成する方法であって、
a)前記対象の複数の画像フレームから形成された開始の合成画像を評価するステップと、
b)前記現在の画像フレームを複数の空間領域に分割するステップと、
c)前記空間領域のそれぞれにおける対象の動きを求めるステップと、
d)各現在の画像フレーム領域内のデータと他の取得画像フレームデータとを、前記領
域において検出された前記対象の動きによって決定されるやり方で合成することによって
、領域ごとに更新された合成画像を作成するステップと、
e)HYPR処理および前記更新された合成画像を用いて前記対象の画像を生成するステップと、
を含む方法。 - 各領域が前記画像フレームの1画素サイズとされる請求項1に記載の方法。
- 現在の合成画像が前記他の取得画像フレームデータから作成され、前記現在の合成画像が前記現在の画像フレームに登録され、前記現在の画像フレームと統合されて前記更新された合成画像が作成され、前記登録が各領域ごとに別々に行われる、請求項1に記載の方法。
- 前記領域がそれぞれ前記画像フレームの1画素サイズとされる請求項3に記載の方法。
- 前記登録が、前記現在の合成画像における、前記現在の画像フレームの領域内の前記データと最良にマッチするデータの領域を探索するステップを含む、請求項3に記載の方法。
- 前記登録が、前記現在の合成画像内のデータの領域の位置を移動するステップを含む、請求項5に記載の方法。
- 前記現在の画像フレームの前記登録された現在の合成画像との前記統合が、
前記登録された現在の合成画像を最大1.0までの値の範囲の崩壊定数で乗算する、ステップと、
前記現在の画像フレーム内の前記データを前記前のステップの結果に加算する、ステップと、
を含む、請求項3に記載の方法。 - 前記統合が、前記前のステップの前記結果を、前記現在の合成画像を作成するのに使用される他の画像フレームの数を示す数で除算するステップも含む、請求項7に記載の方法。
- 前記更新された合成画像が、前記現在の画像フレームの取得を含むある時間ウィンドウにわたる前記他の取得画像フレームデータを集積することによって作成され、前記時間ウィンドウの期間が、各領域ごとに集積される画像フレームデータの量が前記領域内の対象の動きによって決定されるように、前記現在の画像フレームの各領域ごとに別々に決定される、請求項1に記載の方法。
- 前記領域がそれぞれ前記画像フレームの1画素サイズとされる請求項9に記載の方法。
- 前記ステップc)が、心位相を示す前記対象からの信号を取得することによって行われ、前記対象の動きが、前記現在の画像フレームが取得される際のこの信号から示唆される、請求項1に記載の方法。
Applications Claiming Priority (4)
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US97282807P | 2007-09-17 | 2007-09-17 | |
US60/972828 | 2007-09-17 | ||
US2345408P | 2008-01-25 | 2008-01-25 | |
US61/023454 | 2008-01-25 |
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JP2009082703A JP2009082703A (ja) | 2009-04-23 |
JP5523686B2 true JP5523686B2 (ja) | 2014-06-18 |
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US (1) | US8825138B2 (ja) |
JP (1) | JP5523686B2 (ja) |
HK (1) | HK1132158A1 (ja) |
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US6111582A (en) * | 1996-12-20 | 2000-08-29 | Jenkins; Barry L. | System and method of image generation and encoding using primitive reprojection |
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ATE492006T1 (de) * | 2005-07-08 | 2011-01-15 | Wisconsin Alumni Res Found | Rückprojektions-rekonstruktionsverfahren für ct- bildgebung |
US7358730B2 (en) * | 2005-09-22 | 2008-04-15 | Wisconsin Alumni Research Foundation | Diffusion tensor imaging using highly constrained image reconstruction method |
WO2007037951A2 (en) * | 2005-09-22 | 2007-04-05 | Wisconsin Alumni Research Foundation | Reconstruction of motion encoded mr images involving a highly constrained backprojection |
US7408347B2 (en) * | 2005-09-22 | 2008-08-05 | Wisconsin Alumni Research Foundation | Highly constrained magnetic resonance spectroscopy image reconstruction method |
US7647088B2 (en) * | 2005-09-22 | 2010-01-12 | Wisconsin Alumni Research Foundation | Reconstruction method for images of the beating heart |
WO2007038227A1 (en) * | 2005-09-22 | 2007-04-05 | Wiconsin Alumni Research Foundation | Functional mri involving a highly constrained backprojection |
JP4708944B2 (ja) * | 2005-09-26 | 2011-06-22 | キヤノン株式会社 | 画像撮影装置及び画像撮影方法 |
US7991452B2 (en) * | 2007-01-02 | 2011-08-02 | Wisconsin Alumni Research Foundation | Contrast enhanced MRA with highly constrained backprojection reconstruction using phase contrast composite image |
ATE542196T1 (de) * | 2007-02-19 | 2012-02-15 | Wisconsin Alumni Res Found | Verfahren zur lokalisierten und stark eingeschränkten bildrekonstruktion |
EP1959397B1 (en) * | 2007-02-19 | 2019-08-07 | Wisconsin Alumni Research Foundation | Iterative HYPR medical image reconstruction |
US8111810B2 (en) * | 2007-11-13 | 2012-02-07 | Wisconsin Alumni Research Foundation | Method for producing highly constrained ultrasound images |
EP2232446B1 (en) * | 2007-12-20 | 2013-04-17 | Wisconsin Alumni Research Foundation | Method for prior image constrained image reconstruction |
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