JP6000549B2 - 強度変調x線源を用いたシステム及び方法 - Google Patents
強度変調x線源を用いたシステム及び方法 Download PDFInfo
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Description
・強度変調された線源のOSPが従来の線形加速装置のX線源と同等である場合は、要求されるX線強度が貨物の低い濃度領域では小さくなるために、強度変調された線源によって発生した放射線の平均量は、平均して(上記のように)かなりの因数分減少される。
・強度変調された線源のOSPは、強度変調された平均放射線量が同等の従来の線源とおよそ同じになるように、従来の同等の線形加速装置X線源に対して因数F分高くなるように選択される。6MeVの線源では、F=4とするとこの目標を達成できる。事実、放射線の到達範囲(footprint)は従来の線源よりやや小さくなる。これは、平均して、F=4による増加が画像の小さい部分にのみ必要とされるからである。しかしながら、濃度の高い貨物における透過能力は、鉄5cm相当分増加する。これは、鉄の板の後に鉛のブロックを用いて測定した場合には、6MeVの線源を使った40cmの鉄の最先端の透過能力に対して約13パーセントの改善を意味している。
・これら2つの極端な例の中間として様々な構成が可能である。例えば、といってもこの例に限定されるわけではないが、6MeVのX線源において、因数1.65分だけ平均放射線の到達範囲(footprint)を低下させて、2.5cmの鉄に相当する透過能力を得ることができる。
Inew = Icur * A / Dmin (1)
= Imax * exp (-log(2)*floor[log((Imax * Dmin)/(A * Icur))/log(2)]) (2)
Claims (11)
- 1MeVから15MeVの範囲のエネルギーを有する線形加速装置を備えた複数のパルスX線源と、
複数の第1X線検出器を備えた第1検出器アレイと、
複数の第2X線検出器を備えた第2検出器アレイと、
制御装置とを有し、
前記制御装置は、前記第1検出器アレイにおける複数の第1X線検出器の少なくとも一つから検出された最低X線透過レベルを受取り、及び、特定し、
前記制御装置は、前記最低X線透過レベルを既定の閾透過レベルと比較し、
前記制御装置は、前記比較に基づいて、後続する放射線パルスのための調整信号を生成し、
前記制御装置は、前記第1検出器アレイによって検出された放射線でなく、前記第2検出器アレイによって検出された放射線から透過画像を生成するように構成され、
前記パルスX線源は、前記後続する放射線パルスのための調整信号を受信し、前記後続する放射線パルスのための調整信号に基づきX線のパルスの持続時間をパルス毎に調整することにより要求される線源強度を生成することを特徴とする貨物のX線写真撮影のためのX線走査システム。 - 前記制御装置は、最低X線透過レベルと第1の既定の閾値とを比較し、前記最低X線透過レベルが前記第1の既定の閾値より小さければ、前記制御装置は、前記パルスX線源にX線パルスの持続期間を増加させる調整信号を生成することを特徴とする請求項1に記載のX線走査システム。
- 前記制御装置は、前記最低X線透過レベルと、第1の既定の閾値および第2の既定の閾値とを比較し、前記最低X線透レベルが前記第1の既定の閾値より大きく、前記第2の既定の閾値より小さければ、前記制御装置は、前記パルスX線源にX線のパルスの持続時間を変更しないようにさせる調整信号を生成することを特徴とする請求項1に記載のX線走査システム。
- 前記制御装置は、前記最低X線透過レベルと、第1、2の既定の閾値とを比較し、前記最低X線透レベルが前記第2の既定の閾値より大きければ、前記制御装置は、前記パルスX線源にX線のパルスの持続時間を減少させる調整信号を生成することを特徴とする請求項1に記載のX線走査システム。
- 前記制御装置は、処理装置を有するコンピュータを有し、
前記処理装置は、前記第1検出器アレイの前記複数の第1X線検出器の少なくとも一つから信号を受信する入出力ボードと連動することを特徴とする請求項1に記載のX線走査システム。 - 前記処理装置は、フィールドプログラマブルゲートアレイまたは特定用途向け集積回路の少なくとも一つであることを特徴とする請求項5に記載のX線走査システム。
- 1MeVから15MeVの範囲のエネルギーを有する線形加速装置を備えたパルスX線源と、複数の第1X線検出器を備えた第1検出器アレイと、複数の第2X線検出器を備えた第2検出器アレイと、を有する貨物のX線写真撮影のためのX線走査システムの組み込み方法において、
制御装置を組み込み、
前記制御装置は、前記第1検出器アレイにおける複数の第1X線検出器の少なくとも一つから、最低X線透過レベルを受取り、特定し、前記制御装置は、前記最低X線透過レベルを既定の閾透過レベルと比較し、前記制御装置は、前記比較に基づいて、調整信号を生成し、前記第2検出器アレイからのデータは前記調整信号を決定するためでなく透過画像を生成するために用いられ、前記調整信号は、X線のパルスの持続時間をパルス毎に調整することにより後続するX線パルスに対する線源強度を変化させるように構成されることを特徴とする方法。 - 前記制御装置は、最低X線透過レベルと第1の既定の閾値とを比較し、前記最低X線透過得レベルが前記第1の既定の閾値より小さければ、前記制御装置は、前記パルスX線源にX線パルス持続期間を増加させる調整信号を生成することを特徴とする請求項7に記載の方法。
- 前記制御装置は、前記最低X線透過レベルと、第1の既定の閾値および第2の既定の閾値とを比較し、前記最低X線透レベルが前記第1の既定の閾値より大きく、前記第2の既定の閾値より小さければ、前記制御装置は、前記パルスX線源にX線のパルスの持続時間を変更しないようにさせる調整信号を生成することを特徴とする請求項7に記載の方法。
- 前記制御装置は、前記最低X線透過レベルと、第1の既定の閾値および第2の既定の閾値とを比較し、前記最低X線透レベルが前記第2の既定の閾値より大きければ、前記制御装置は、前記パルスX線源にX線のパルス持続時間を減少させる調整信号を生成することを特徴とする請求項7に記載の方法。
- 前記制御装置は、処理装置を有するコンピュータを有し、
前記処理装置は、前記第1検出器アレイにおける前記複数の第1X線検出器の少なくとも一つから信号を受信する入出力ボードと連動することを特徴とする請求項7に記載の方法。
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| US8781008P | 2008-08-11 | 2008-08-11 | |
| US61/087,810 | 2008-08-11 | ||
| PCT/US2009/047292 WO2010019311A2 (en) | 2008-08-11 | 2009-06-12 | Systems and methods for using an intensity-modulated x-ray source |
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| JP6000549B2 true JP6000549B2 (ja) | 2016-09-28 |
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| EP (2) | EP2327281B1 (ja) |
| JP (1) | JP6000549B2 (ja) |
| CN (2) | CN102440078A (ja) |
| HK (2) | HK1251298A1 (ja) |
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- 2009-06-12 CN CN200980140400XA patent/CN102440078A/zh active Pending
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- 2009-06-12 WO PCT/US2009/047292 patent/WO2010019311A2/en not_active Ceased
- 2009-06-12 CN CN201710916561.XA patent/CN107782751B/zh active Active
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Also Published As
| Publication number | Publication date |
|---|---|
| HK1251298A1 (en) | 2019-01-25 |
| EP2327281A4 (en) | 2015-03-18 |
| EP3287773A1 (en) | 2018-02-28 |
| HK1251656A1 (zh) | 2019-02-01 |
| EP3287773B1 (en) | 2021-03-03 |
| US20100034355A1 (en) | 2010-02-11 |
| EP2327281B1 (en) | 2017-11-29 |
| PL2327281T3 (pl) | 2018-10-31 |
| WO2010019311A3 (en) | 2012-05-24 |
| US8054937B2 (en) | 2011-11-08 |
| WO2010019311A2 (en) | 2010-02-18 |
| EP2327281A2 (en) | 2011-06-01 |
| US8781067B2 (en) | 2014-07-15 |
| US20130329855A1 (en) | 2013-12-12 |
| CN102440078A (zh) | 2012-05-02 |
| JP2012510043A (ja) | 2012-04-26 |
| PL3287773T3 (pl) | 2021-10-25 |
| US8437448B2 (en) | 2013-05-07 |
| US20120257719A1 (en) | 2012-10-11 |
| CN107782751B (zh) | 2021-10-26 |
| CN107782751A (zh) | 2018-03-09 |
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