JP2021168914A - 断層画像撮影システムにおけるゲーティング方法 - Google Patents
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- 230000029058 respiratory gaseous exchange Effects 0.000 description 8
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Abstract
Description
本出願は、2020年4月13日に出願された米国仮出願第63/009,168号の利益を主張する。当該出願の全内容は、あらゆる目的のために参照により本明細書に組み込まれる。
Claims (9)
- 断層画像撮影システムにおけるゲーティング方法であって、
(a)複数の投影画像を様々な角度で取得するために、対象の断層画像撮影を行うステップと、
前記投影画像内の前記対象の標的は、第1軸に沿って周期的に移動し、
(b)前記投影画像の各々において、前記第1軸に垂直な第2軸の方向に沿って画素値を合計することにより、前記第1軸上の複数の投影曲線を取得するステップと、
(c)前記投影画像上の標的ゾーンを決定するステップと、
前記標的は前記標的ゾーン内に投射され、前記標的ゾーンの前記第1軸上の中心位置は、前記第1軸上の前記投影曲線において最大の変動を持つ位置に対応し、
(d)各々の前記投影画像上の前記標的ゾーン内の全画素値のパラメータ値を算出し、及び、前記投影画像の前記パラメータ値に応じて前記標的の移動周期曲線を取得するステップと、
(e)前記標的の前記移動周期曲線に応じて、前記画像再構成のために前記移動周期内で同じ状態にある前記投影画像を選択するステップとを備える、
断層画像撮影システムにおけるゲーティング方法。 - 請求項1に記載の方法であって、
前記断層画像撮影を実行すると、前記投影画像を様々な角度で取得するために、光源及び検出器が前記対象の周りを定期的に移動する、方法。 - 請求項3に記載の方法であって、
前記光源及び前記検出器は、前記第1軸に平行な回転軸に対して回転する、方法。 - 請求項1に記載の方法であって、
前記投影画像の数は、前記投影画像に基づいて形成される断層画像に要求される画質に応じて決定する、方法。 - 請求項1に記載の方法であって、
各々の前記投影画像は、前記第1軸に沿って複数の列を持つ画素値の行列とみなし、各列の前記画素値を合計し、前記投影画像内の前記画素値の合計が最大の変動を持つ前記列が、前記標的ゾーンの前記中心位置である、方法。 - 請求項1に記載の方法であって、
前記投影曲線において、時系列に沿って変動係数、又は標準偏差を算出し、最大の変動係数、又は最大の標準偏差を持つ前記第1軸上の位置が、前記標的ゾーンの前記第1軸上の前記中心位置に対応する、方法。 - 請求項1に記載の方法であって、
前記パラメータ値は、前記標的ゾーン内の前記画素値の最大値、最小値、平均値、中央値、総和、四分位値のいずれかである、方法。 - 請求項1に記載の方法であって、
前記標的の前記移動周期曲線は、前記パラメータ値と時間との関係を表すグラフ、又は前記パラメータ値と前記投影画像のシリアル番号との関係を表すグラフである、方法。
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US63/009,168 | 2020-04-13 | ||
US17/210,201 US11694374B2 (en) | 2020-04-13 | 2021-03-23 | Method for gating in tomographic imaging system |
US17/210,201 | 2021-03-23 |
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