JP2000287965A5 - - Google Patents
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- JP2000287965A5 JP2000287965A5 JP1999102966A JP10296699A JP2000287965A5 JP 2000287965 A5 JP2000287965 A5 JP 2000287965A5 JP 1999102966 A JP1999102966 A JP 1999102966A JP 10296699 A JP10296699 A JP 10296699A JP 2000287965 A5 JP2000287965 A5 JP 2000287965A5
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- 238000003384 imaging method Methods 0.000 description 16
- 238000001514 detection method Methods 0.000 description 15
- 239000002872 contrast media Substances 0.000 description 6
- 230000000737 periodic Effects 0.000 description 6
- 230000000241 respiratory Effects 0.000 description 3
Description
【特許請求の範囲】
【請求項1】 造影剤が注入された被検体のデータをX線撮影手段により収集し、そのデータに基づいて画像を再構成するものであり、監視スキャンにより得られた画像に基づいて所望部位のCT値をCT値算出手段により算出し、その算出したCT値に基づいて監視スキャンの終了と本スキャンの開始を決めるX線CT装置において、
前記被検体の略周期的な体動を検出する体動検出手段と、
前記X線撮影手段を制御するものであり、前記体動検出手段からの体動検出出力に基づいて前記CT値算出手段で算出された安定した状態のCT値を選択して取り込み、この取り込んだCT値と前記所定のしきい値とを比較して監視スキャンの終了と本スキャンの開始を決める制御手段と、
を備えることを特徴とするX線CT装置。
【請求項2】
造影剤が注入された被検体のデータをX線撮影手段により収集し、そのデータに基づいて画像を再構成する再構成手段を備えるものであり、監視スキャンにより得られた画像に基づいて所望部位のCT値をCT値算出手段により求め、そのCT値に基づいて、監視スキャンの終了と本スキャンの開始を決めるX線CT装置において、
前記被検体の略周期的な体動を検出する体動検出手段を有し、
前記監視スキャン時において、前記CT値算出手段で算出されるCT値が安定した値となるように、前記体動検出手段からの体動検出出力に基づいて前記画像再構成手段の画像再構成タイミングを制御する制御手段と、
を備えることを特徴とするX線CT装置。
【請求項3】
造影剤が注入された被検体のデータをX線撮影手段により収集し、そのデータに基づいて画像を再構成する再構成手段を備えるものであり、監視スキャンにより得られた画像に基づいて所望部位のCT値をCT値算出手段により求め、そのCT値に基づいて、監視スキャンの終了と本スキャンの開始を決めるX線CT装置において、
被検体の略周期的な体動を検出する体動検出手段を有し、
前記監視スキャン時において、前記CT値算出手段で算出されるCT値が安定した値となるように、前記体動検出手段からの体動検出出力に基づいて、間欠的にX線像の撮影を行うように前記X線撮影手段の撮影タイミングを制御する制御手段と、
を備えることを特徴とするX線CT装置。
【請求項4】 前記体動検出手段は、被検体の呼吸状態を検出する呼吸センサ、或いは被検体の心臓の動きを検出する心電センサであることを特徴とする請求項1乃至請求項3のうちいずれか1項記載のX線CT装置。
【請求項5】 前記CT値は、前記画像内のCT値の平均値であることを特徴とする請求項1乃至請求項4のうちいずれか1項記載のX線CT装置。
[Claims]
1. A desired site is obtained by collecting data of a subject injected with a contrast medium by an X-ray imaging means and reconstructing an image based on the data, and based on an image obtained by a surveillance scan. In the X-ray CT apparatus, which calculates the CT value of the above by the CT value calculation means and determines the end of the monitoring scan and the start of the main scan based on the calculated CT value.
A body motion detecting means for detecting a substantially periodic body motion of the subject, and
It controls the X-ray imaging means, selects and captures a stable CT value calculated by the CT value calculating means based on the body motion detection output from the body motion detecting means, and captures the CT value. A control means that compares the CT value with the predetermined threshold value to determine the end of the monitoring scan and the start of the main scan.
An X-ray CT apparatus comprising.
2.
It is provided with a reconstruction means for collecting data of a subject injected with a contrast medium by an X-ray imaging means and reconstructing an image based on the data, and a desired site based on an image obtained by a surveillance scan. In an X-ray CT apparatus that determines the end of the surveillance scan and the start of the main scan based on the CT value obtained by the CT value calculation means.
It has a body motion detecting means for detecting a substantially periodic body motion of the subject, and has a body motion detecting means.
At the time of the monitoring scan, the image reconstruction timing of the image reconstruction means is based on the body motion detection output from the body motion detection means so that the CT value calculated by the CT value calculation means becomes a stable value. Control means to control
An X-ray CT apparatus comprising.
3.
It is provided with a reconstruction means for collecting data of a subject injected with a contrast medium by an X-ray imaging means and reconstructing an image based on the data, and a desired site based on an image obtained by a surveillance scan. In an X-ray CT apparatus that determines the end of the surveillance scan and the start of the main scan based on the CT value obtained by the CT value calculation means.
It has a body motion detecting means for detecting a substantially periodic body motion of a subject, and has a body motion detecting means.
At the time of the monitoring scan, an X-ray image is intermittently taken based on the body motion detection output from the body motion detection means so that the CT value calculated by the CT value calculation means becomes a stable value. A control means for controlling the imaging timing of the X-ray imaging means, and
An X-ray CT apparatus comprising.
4. The body motion detecting means is a respiratory sensor for detecting a respiratory state of a subject or an electrocardiographic sensor for detecting the movement of the heart of the subject. The X-ray CT apparatus according to any one of the above.
5. The X-ray CT apparatus according to claim 1, wherein the CT value is an average value of CT values in the image.
【0008】
【課題を解決するための手段】
請求項1にかかる本発明は、造影剤が注入された被検体のデータをX線撮影手段により収集し、そのデータに基づいて画像を再構成するものであり、監視スキャンにより得られた画像に基づいて所望部位のCT値をCT値算出手段により算出し、その算出したCT値に基づいて監視スキャンの終了と本スキャンの開始を決めるX線CT装置において、前記被検体の略周期的な体動を検出する体動検出手段と、前記X線撮影手段を制御するものであり、前記体動検出手段からの体動検出出力に基づいて前記CT値算出手段で算出された安定した状態のCT値を選択して取り込み、この取り込んだCT値と前記所定のしきい値とを比較して監視スキャンの終了と本スキャンの開始を決める制御手段と、を備えることを特徴とする。
0008
[Means for solving problems]
The present invention according to claim 1 is to collect data of a subject into which a contrast medium is injected by an X-ray imaging means and reconstruct an image based on the data, and to obtain an image obtained by a surveillance scan. In an X-ray CT apparatus that calculates the CT value of a desired site based on the CT value calculation means and determines the end of the monitoring scan and the start of the main scan based on the calculated CT value, the body of the subject is substantially periodic. It controls the body motion detecting means for detecting motion and the X-ray photographing means, and is a CT in a stable state calculated by the CT value calculating means based on the body motion detection output from the body motion detecting means. It is characterized by including a control means for selecting and capturing a value, comparing the captured CT value with the predetermined threshold value, and determining the end of the monitoring scan and the start of the main scan.
CT値算出手段で算出されるCT値は、被検体の体動によりその値が変動する。このため、当該X線CT装置では、体動検出手段により、例えば呼吸変動や心拍等の被検体の周期的な体動を検出する。制御手段は、この体動検出出力に基づいて、CT値算出手段で算出されたCT値のうち、値が安定したCT値を選択して取り込み、この取り込んだCT値と前記しきい値とを比較して監視スキャンの終了と本スキャンの開始を決める。これにより、値が安定したCT値に基づいて、監視スキャンから本スキャンへの移行を図ることができるため、正確なタイミングで監視スキャンから本スキャンへの移行を図ることができる。 The CT value calculated by the CT value calculating means fluctuates depending on the body movement of the subject. Therefore, in the X-ray CT apparatus, the body movement detecting means detects the periodic body movement of the subject such as respiratory fluctuation and heartbeat. Based on this body movement detection output, the control means selects and captures a CT value having a stable value from the CT values calculated by the CT value calculation means, and captures the captured CT value and the threshold value. The end of the surveillance scan and the start of the main scan are decided by comparison. As a result, the transition from the surveillance scan to the main scan can be achieved based on the CT value whose value is stable, so that the transition from the surveillance scan to the main scan can be achieved at an accurate timing.
請求項2にかかる本発明は、造影剤が注入された被検体のデータをX線撮影手段により収集し、そのデータに基づいて画像を再構成する再構成手段を備えるものであり、監視スキャンにより得られた画像に基づいて所望部位のCT値をCT値算出手段により求め、そのCT値に基づいて、監視スキャンの終了と本スキャンの開始を決めるX線CT装置において、前記被検体の略周期的な体動を検出する体動検出手段を有し、前記監視スキャン時において、前記CT値算出手段で算出されるCT値が安定した値となるように、前記体動検出手段からの体動検出出力に基づいて前記画像再構成手段の画像再構成タイミングを制御する制御手段と、を備えることを特徴とする。 The present invention according to claim 2 is provided with a reconstructing means for collecting data of a subject into which a contrast medium is injected by an X-ray imaging means and reconstructing an image based on the data, and by a surveillance scan. In an X-ray CT apparatus that determines the CT value of a desired site based on the obtained image by a CT value calculating means and determines the end of the monitoring scan and the start of the main scan based on the CT value, the approximate cycle of the subject. It has a body movement detecting means for detecting a specific body movement, and the body movement from the body movement detecting means so that the CT value calculated by the CT value calculating means becomes a stable value at the time of the monitoring scan. It is characterized by including a control means for controlling the image reconstruction timing of the image reconstruction means based on the detection output.
CT値算出手段は、画像再構成手段により画像再構成されたX線像に基づいてCT値の算出を行うため、安定した値のCT値を得ることができるような画像を、画像再構成手段からCT値算出手段に供給すればよい。このため、当該X線CT装置は、監視スキャン時において、前記制御手段が、体動検出手段からの体動検出出力に基づいて画像再構成手段の画像再構成タイミングを制御する。これにより、値が安定したCT値に基づいて、監視スキャンから本スキャンへの移行を図ることができるため、正確なタイミングで監視スキャンから本スキャンへの移行を図ることができる。 Since the CT value calculating means calculates the CT value based on the X-ray image reconstructed by the image reconstructing means, the image reconstructing means obtains an image capable of obtaining a stable CT value. May be supplied to the CT value calculating means. Therefore, in the X-ray CT apparatus, the control means controls the image reconstruction timing of the image reconstruction means based on the body motion detection output from the body motion detection means during the monitoring scan. As a result, the transition from the surveillance scan to the main scan can be achieved based on the CT value whose value is stable, so that the transition from the surveillance scan to the main scan can be achieved at an accurate timing.
請求項3にかかる本発明に係るX線CT装置は、造影剤が注入された被検体のデータをX線撮影手段により収集し、そのデータに基づいて画像を再構成する再構成手段を備えるものであり、監視スキャンにより得られた画像に基づいて所望部位のCT値をCT値算出手段により求め、そのCT値に基づいて、監視スキャンの終了と本スキャンの開始を決めるX線CT装置において、被検体の略周期的な体動を検出する体動検出手段を有し、前記監視スキャン時において、前記CT値算出手段で算出されるCT値が安定した値となるように、前記体動検出手段からの体動検出出力に基づいて、間欠的にX線像の撮影を行うように前記X線撮影手段の撮影タイミングを制御する制御手段と、を備えることを特徴とする。 The X-ray CT apparatus according to the third aspect of the present invention includes a reconstructing means for collecting data of a subject into which a contrast medium is injected by an X-ray photographing means and reconstructing an image based on the data. In the X-ray CT apparatus, the CT value of the desired part is obtained by the CT value calculation means based on the image obtained by the surveillance scan, and the end of the surveillance scan and the start of the main scan are determined based on the CT value. The body movement detection means for detecting the substantially periodic body movement of the subject, and the body movement detection is performed so that the CT value calculated by the CT value calculation means becomes a stable value at the time of the monitoring scan. A control means for controlling the imaging timing of the X-ray imaging means so as to intermittently capture an X-ray image based on a body motion detection output from the means is provided.
すなわち、CT値算出手段は、画像再構成手段により画像再構成された画像に基づいてCT値の算出を行うため、安定した値のCT値を得ることができるような画像を、画像再構成手段からCT値算出手段に供給すればよい。このため、当該X線CT装置は、監視スキャン時において、体動検出手段からの体動検出出力に基づいてX線撮影手段の撮影タイミングを制御することで、画像再構成手段で形成される画像を、CT値算出手段で安定した値のCT値を得ることができるような画像とする。これにより、値が安定したCT値に基づいて、監視スキャンから本スキャンへの移行を図ることができるため、正確なタイミングで監視スキャンから本スキャンへの移行を図ることができる。また、体動検出手段からの体動検出出力に基づいてX線撮影手段の撮影タイミングを制御することで、X線撮影手段を間欠的に撮影制御することができるため、監視スキャンにおいて、被検体に対するX線の曝射を間欠的なものとすることができ、被検体の被曝を大幅に低減することができる。
That is, since the CT value calculating means calculates the CT value based on the image reconstructed by the image reconstructing means, the image reconstructing means obtains an image capable of obtaining a stable CT value. May be supplied to the CT value calculating means. Therefore, the X-ray CT apparatus controls the imaging timing of the X-ray imaging means based on the body motion detection output from the body motion detecting means at the time of surveillance scanning, so that the image formed by the image reconstructing means. Is an image in which a stable CT value can be obtained by the CT value calculating means. As a result, the transition from the surveillance scan to the main scan can be achieved based on the CT value whose value is stable, so that the transition from the surveillance scan to the main scan can be achieved at an accurate timing. Further, by controlling the imaging timing of the X-ray imaging means based on the body motion detection output from the body motion detecting means, the X-ray imaging means can be intermittently controlled for imaging. The exposure of X-rays to the subject can be intermittent, and the exposure of the subject can be significantly reduced.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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JP10296699A JP4744662B2 (en) | 1999-04-09 | 1999-04-09 | X-ray CT system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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JP10296699A JP4744662B2 (en) | 1999-04-09 | 1999-04-09 | X-ray CT system |
Publications (3)
Publication Number | Publication Date |
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JP2000287965A JP2000287965A (en) | 2000-10-17 |
JP2000287965A5 true JP2000287965A5 (en) | 2006-06-08 |
JP4744662B2 JP4744662B2 (en) | 2011-08-10 |
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JP10296699A Expired - Lifetime JP4744662B2 (en) | 1999-04-09 | 1999-04-09 | X-ray CT system |
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Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
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JP5132515B2 (en) * | 2001-12-20 | 2013-01-30 | 株式会社東芝 | X-ray computed tomography system |
JP4230724B2 (en) * | 2001-12-20 | 2009-02-25 | 株式会社東芝 | X-ray computed tomography system |
US6763082B2 (en) * | 2002-02-27 | 2004-07-13 | Kabushiki Kaisha Toshiba | X-ray computer tomography apparatus |
JP4601931B2 (en) * | 2002-09-05 | 2010-12-22 | 株式会社東芝 | X-ray CT system |
JP4921834B2 (en) * | 2006-04-07 | 2012-04-25 | 株式会社東芝 | X-ray computed tomography diagnostic system |
JP5192354B2 (en) * | 2008-11-04 | 2013-05-08 | 株式会社リガク | Region specifying method, volume measuring method using the same, region specifying device and region specifying program |
JP2014054323A (en) * | 2012-09-11 | 2014-03-27 | Toshiba Corp | Fluoroscope, x-ray ct apparatus and x-ray output control program |
WO2014199995A1 (en) | 2013-06-11 | 2014-12-18 | 株式会社 東芝 | X-ray computed tomography device and method for determining scan start timing |
JP5689925B2 (en) * | 2013-07-02 | 2015-03-25 | 株式会社東芝 | X-ray CT system |
-
1999
- 1999-04-09 JP JP10296699A patent/JP4744662B2/en not_active Expired - Lifetime
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