JPH0529456B2 - - Google Patents
Info
- Publication number
- JPH0529456B2 JPH0529456B2 JP59146592A JP14659284A JPH0529456B2 JP H0529456 B2 JPH0529456 B2 JP H0529456B2 JP 59146592 A JP59146592 A JP 59146592A JP 14659284 A JP14659284 A JP 14659284A JP H0529456 B2 JPH0529456 B2 JP H0529456B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- light beam
- subject
- signal
- nmr
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000033001 locomotion Effects 0.000 claims description 44
- 230000000241 respiratory effect Effects 0.000 claims description 9
- 238000003384 imaging method Methods 0.000 claims description 5
- 230000005855 radiation Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims 1
- 238000006073 displacement reaction Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 3
- 210000001015 abdomen Anatomy 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
Description
【発明の詳細な説明】
(イ) 産業上の利用分野
本発明は被検体の呼吸性体動検出器付NMRイ
メージング装置に関する。DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to an NMR imaging apparatus with a respiratory motion detector of a subject.
(ロ) 従来技術
生体内の所定の断面層よりのNMR信号に、例
えば、２次元フーリエ変換をほどこして生体の内
部断面構造を映像表示する場合、一断面の映像化
に数分の時間（２分〜10分）を要する。従つて生
体の呼吸性体動を伴う部位の断面構造の撮像には
体動による像のぼやけが生ずる。(b) Prior art When displaying an image of the internal cross-sectional structure of a living body by applying two-dimensional Fourier transform to the NMR signal from a predetermined cross-sectional layer within the living body, it takes several minutes (2 (~10 minutes). Therefore, when capturing an image of a cross-sectional structure of a part of a living body that is accompanied by respiratory body movements, blurring of the image occurs due to the body movements.
(ハ) 目的
本発明の目的は従来技術に伴う上記の欠点を排
除し、呼吸性体動を伴う部位に対しても、ぼやけ
のない鮮明な撮像をすることのできるNMRイメ
ージング装置を提供することにある。(c) Purpose An object of the present invention is to provide an NMR imaging device that eliminates the above-mentioned drawbacks associated with the prior art and is capable of capturing clear images without blurring even for regions that involve respiratory body movements. It is in.
(ニ) 構成
上記の目的を達成するため本発明による装置
は、所定の放射角で光ビームを出力する光源と、
被検体である上記生体に装着され生体の呼吸性体
動に連動して変位することにより上記光ビームの
少なくとも一部を周期的に遮光する遮光体と、上
記光ビームを受光して上記生体の体動に応じて変
化する体動信号を発する受光器から生る体動検出
器を有し、NMR信号の上記映像信号化処理が上
記体動信号に同期して行われることを特徴として
いる。(d) Configuration In order to achieve the above object, the device according to the present invention includes a light source that outputs a light beam at a predetermined radiation angle;
a light shielding body that is attached to the living body, which is the subject, and which periodically blocks at least a portion of the light beam by displacing in conjunction with the respiratory body movements of the living body; It is characterized in that it has a body motion detector generated from a light receiver that emits a body motion signal that changes in response to body motion, and that the processing of converting the NMR signal into a video signal is performed in synchronization with the body motion signal.
(ホ) 実施例
以下に本発明の実施例を図面に基づいて説明す
る。(e) Examples Examples of the present invention will be described below based on the drawings.
第１図は本発明の実施例に用いる体動検出器の
構成を示す図で、被検体である人体１の腹部上面
に例えばベルトを用いて遮光体２が装着されてい
る。この遮光体２を挟んでその両側には、拡がり
のない直線状の光ビーム４を発する光源（例えば
レーザ）３と、それに対向する受光器５が配置さ
れている。遮光体２は人体１の呼吸動に伴つて上
下に運動し、光ビーム５を断続的に遮断する。受
光器５はそこに到達する光ビーム４の断続に対応
して断続する電気信号を出力する。第２図は、こ
のように構成された体動検出器の作用を説明する
図で、同図の曲線Ａで示されるような人体１の呼
吸動に対応して受光器５は、同図にＢで示す断続
電気信号を体動検出信号として出力する。 FIG. 1 is a diagram showing the configuration of a body motion detector used in an embodiment of the present invention, in which a light shielding body 2 is attached to the upper surface of the abdomen of a human body 1, which is a subject, using, for example, a belt. On both sides of the light shield 2, a light source (for example, a laser) 3 that emits a linear light beam 4 without expansion and a light receiver 5 facing the light source 3 are arranged. The light shielding body 2 moves up and down in accordance with the breathing motion of the human body 1, and interrupts the light beam 5 intermittently. The light receiver 5 outputs an electrical signal that is interrupted in response to the interruption of the light beam 4 that reaches it. FIG. 2 is a diagram illustrating the operation of the body motion detector configured as described above. In response to the respiratory movement of the human body 1 shown by curve A in the figure, the light receiver 5 An intermittent electrical signal indicated by B is output as a body movement detection signal.
一方、被検体である人体に対しては、傾斜磁場
による方法など、既知の方法でその特定の断面、
例えば第１図に破線Ａ−Ａで示した断面内で、共
鳴条件が満足されるように措置されている。そこ
で、体動信号の最初の立下り（A1）に同期して、
断面Ａ−ＡからのNMR信号データのうち、例え
ばｘ軸方向第１列目のデータを取り込み、第２番
目の立下り（A2）に同期して第２列目のデータ
を取り込むよう、体動信号の立下りに同期して順
次データを取り込み、既知の方法でNMR信号の
映像信号化処理を行えば、常に体動の同じ変動相
におけるデータに基づく映像化処理が行われるこ
とになる。従つて、このようにして得られた映像
には画像ぼけを生じない。 On the other hand, for the human body as a subject, known methods such as methods using gradient magnetic fields can be used to
For example, measures are taken so that the resonance condition is satisfied within the cross section indicated by the broken line A-A in FIG. Therefore, in synchronization with the first falling edge (A 1 ) of the body movement signal,
Of the NMR signal data from the cross section A-A, the system is configured so that, for example, the data in the first column in the x-axis direction is captured, and the data in the second column is captured in synchronization with the second falling edge (A 2 ). If data is taken in sequentially in synchronization with the falling edge of a motion signal and the NMR signal is converted into a video signal using a known method, the video conversion process will always be performed based on data in the same fluctuation phase of body movement. Therefore, the image obtained in this way does not suffer from image blur.
さらに、第１図に示した断面Ｂ−Ｂおよび断面
Ｃ−Ｃなど、異なる複数の断面の映像を同時に得
たい場合には、体動信号のｎ番目の立下りに同期
して断面Ａ−Ａのｘ軸方向第ｎ列目のデータ取り
込みを行つた後、共鳴条件を満足する位置を順次
速やかに断面Ｂ−Ｂおよび断面Ｃ−Ｃに移し、そ
れぞれの断面についてｘ軸方向第ｎ番目のデータ
取り込みを行うことにより、断面Ｂ−Ｂ、および
断面Ｃ−Ｃについても、それぞれ、画像ぼけのな
い映像を同時に得ることができる。この場合、各
断面についてのデータ取り込み時点に差があるた
め、原理的には、各映像は体動の異なる変位相に
対応したものになるが、体動の周期に比べてデー
タ取り込み時間は格段に短いため、事実上、各映
像は撮像断面の数が極端に多くない限り、同じ体
動の変動相において得られたものと見なすことが
できる。なお、各断面についてのデータ取り込み
時点の時間差が問題になる場合でも、それぞれの
映像については、同じ体動の変動相において得ら
れたデータによるものであり、各映像に画像ぼけ
が生ずることのないのは勿論である。 Furthermore, if you want to obtain images of a plurality of different cross sections at the same time, such as cross section B-B and cross section C-C shown in FIG. After acquiring data for the n-th column in the x-axis direction, positions that satisfy the resonance condition are immediately transferred to cross-sections B-B and C-C, and the n-th data in the x-axis direction is acquired for each cross-section. By performing the import, it is possible to simultaneously obtain images without image blur for each of the cross sections BB and C-C. In this case, since there is a difference in the data acquisition time for each cross section, in principle each image corresponds to a different phase shift of body movement, but the data acquisition time is significantly longer than the period of body movement. In fact, each image can be considered to have been obtained in the same variable phase of body movement unless the number of imaged sections is extremely large. Furthermore, even if the time difference between the data acquisition points for each cross-section becomes a problem, each image is based on data obtained during the same phase of body movement, so there is no image blurring in each image. Of course.
本発明は、体動検出部を第３図に示すように構
成実施することもできる。すなわち、光源３ａは
所定の拡がりを持つた光ビーム４ａを放射し、人
体に装置された遮光板２ａは光線４ａの拡がりを
全面わたつてカバーするだけの面積を有すると共
に、中央部にそこだけに光を透過させる細孔７を
有している。受光器５ａは縦に配列された多数の
受光素子６を有し、遮光板２ａの細孔７を透過し
た光線に照射された受光素子のみが電気信号を出
力するようになつている。従つて受光器５ａから
は第４図に示すように、体動Ａに対応して断続曲
線Ｂで表わされるような体動検出信号が得られ
る。但し、第４図の縦軸は信号の強度ではなく、
信号を発している受光素子の高さ（位置）を表わ
している。このような体動検出信号が得られる場
合には、同図に矢印A1，B1，C1，A2，B2，C2で
示すように、各断面に関するｘ軸方向第ｎ列目の
データ取り込み時点と、第ｎ＋１列目のデータ取
り込み時点を、体動曲線Ａの腹点に関して対象に
選ぶ。 The present invention can also be implemented by configuring the body movement detecting section as shown in FIG. That is, the light source 3a emits a light beam 4a with a predetermined spread, and the light shielding plate 2a installed on the human body has an area large enough to cover the entire spread of the light beam 4a, and has a light beam 4a in the center. It has pores 7 that allow light to pass through. The light receiver 5a has a large number of light receiving elements 6 arranged vertically, and only the light receiving elements irradiated with the light beam transmitted through the pores 7 of the light shielding plate 2a output electrical signals. Therefore, as shown in FIG. 4, a body movement detection signal represented by an intermittent curve B corresponding to the body movement A is obtained from the light receiver 5a. However, the vertical axis in Figure 4 is not the signal strength;
It represents the height (position) of the light receiving element that is emitting the signal. When such a body movement detection signal is obtained, as shown by arrows A 1 , B 1 , C 1 , A 2 , B 2 , C 2 in the same figure, the The data acquisition time point and the data acquisition time point of the (n+1)th column are selected as targets with respect to the belly point of the body movement curve A.
さらに本発明は、体動検出部を第５図に示すよ
うに構成実施することもできる。この場合光源３
ｂは第３図に示した光源３ａと同じく、所定の拡
がりを持つた光ビームを発し、受光器５ｂは各受
光素子６ｂの出力の和を体動検出信号として出力
する。体動と体動検出信号の関係は第６図に示す
通りで、この場合も、各断面からのデータ取り込
み時点は、第３図に示した実施例の場合と同じよ
うに選ぶ。 Furthermore, the present invention can also be implemented by configuring the body movement detecting section as shown in FIG. In this case light source 3
Like the light source 3a shown in FIG. 3, the light receiver 5b emits a light beam having a predetermined spread, and the light receiver 5b outputs the sum of the outputs of the light receiving elements 6b as a body movement detection signal. The relationship between the body movement and the body movement detection signal is as shown in FIG. 6, and in this case as well, the time points for acquiring data from each section are selected in the same way as in the embodiment shown in FIG.
(ヘ) 効果
以上の説明から明らかなように、本発明によれ
ば、生体の呼吸性体動によるNMR像の画像ぼけ
の問題が容易に解消されるだけでなく、異なる断
面についての複数の映像を同時に得ることも可能
になる。(F) Effect As is clear from the above explanation, according to the present invention, not only can the problem of image blurring of NMR images due to respiratory body movements of a living body be easily solved, but also multiple images of different cross sections can be easily solved. It is also possible to obtain both at the same time.
第１図は本発明実施例における体動検出部の構
成を示す図である。第２図は第１図に示した体動
検出部の作用説明図である。第３図及び第４図は
それぞれ、本発明の他の実施例における体動検出
部の構成図及び同体動検出部の作用説明図であ
る。第５図及び第６図はそれぞれ、本発明のさら
に別の実施例における体動検出部の構成図および
同体動検出部の作用説明図である。
２，２ａ，２ｂ……遮光体、３，３ａ，３ｂ…
…光源、５，５ａ，５ｂ……受光器、６ａ，６ｂ
……受光素子、７……遮光体２ａの細孔。
FIG. 1 is a diagram showing the configuration of a body movement detecting section in an embodiment of the present invention. FIG. 2 is an explanatory diagram of the operation of the body movement detecting section shown in FIG. 1. FIG. 3 and FIG. 4 are respectively a configuration diagram of a body movement detecting section and an action explanatory diagram of the body motion detecting section in another embodiment of the present invention. FIG. 5 and FIG. 6 are a block diagram of a body motion detecting section and an explanatory diagram of the operation of the same body motion detecting section in still another embodiment of the present invention, respectively. 2, 2a, 2b... light shielding body, 3, 3a, 3b...
...Light source, 5, 5a, 5b... Light receiver, 6a, 6b
. . . Light receiving element, 7 . . . Pore of light shielding body 2a.
Claims (1)
NMR信号に映像信号化処理をほどこして生体の
内部断面構造を映像表示する装置であつて、所定
の放射角で光ビームを出力する光源と、被検体で
ある上記生体に装着され生体の呼吸性体動に連動
して変位することにより上記光ビームの少なくと
も一部を周期的に遮光する遮光体と、上記光ビー
ムを受光して上記生体の体動に応じて変化する体
動信号を発する受光器から成る体動検出器を有
し、NMR信号の上記映像信号化処理が上記体動
信号に同期して行われることを特徴とする、被検
体の呼吸性体動検出器付NMRイメージング装
置。 ２ 上記遮光体がその変位位置に係りなく上記光
ビームの全断面をカバーする拡がりを有し、か
つ、上記光ビームの一部を透過させ得る光透過窓
を有することを特徴とする、特許請求の範囲第１
項記載の被検体の呼吸性体動検出器付NMRイメ
ージング装置。 ３ 上記光ビームの放射角が零度であることを特
徴とする、特許請求の範囲第１項記載の被検体の
呼吸性体動検出器付NMRイメージング装置。[Claims] 1. From a predetermined cross-sectional layer of a living body as a subject
It is a device that performs video signal processing on NMR signals to display an image of the internal cross-sectional structure of a living body, and includes a light source that outputs a light beam at a predetermined radiation angle, and a device attached to the living body that is the subject to be examined. a light shielding body that periodically blocks at least a portion of the light beam by displacing in conjunction with body movement; and a light receiving body that receives the light beam and emits a body movement signal that changes in accordance with the body movement of the living body. 1. An NMR imaging apparatus with a respiratory body motion detector for a subject, characterized in that the image signal processing of the NMR signal is performed in synchronization with the body motion signal. 2. A patent claim characterized in that the light shield has a spread that covers the entire cross section of the light beam regardless of its displacement position, and has a light transmission window that can transmit a part of the light beam. range 1
An NMR imaging device equipped with a respiratory motion detector for a subject as described in 2. 3. The NMR imaging apparatus with a respiratory motion detector for a subject according to claim 1, wherein the radiation angle of the light beam is 0 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14659284A JPS6125542A (en) | 1984-07-13 | 1984-07-13 | Nmr imaging apparatus with breathing fetal movement detectorof specimen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14659284A JPS6125542A (en) | 1984-07-13 | 1984-07-13 | Nmr imaging apparatus with breathing fetal movement detectorof specimen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6125542A JPS6125542A (en) | 1986-02-04 |
| JPH0529456B2 true JPH0529456B2 (en) | 1993-04-30 |
Family
ID=15411200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14659284A Granted JPS6125542A (en) | 1984-07-13 | 1984-07-13 | Nmr imaging apparatus with breathing fetal movement detectorof specimen |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6125542A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61154655A (en) * | 1984-12-28 | 1986-07-14 | 株式会社東芝 | Magnetic resonance imaging apparatus |
| JPH07108289B2 (en) * | 1986-09-10 | 1995-11-22 | ゼネラル・エレクトリック・カンパニイ | Apparatus for reducing artifacts in NMR imaging |
| JP3477166B2 (en) | 2000-12-07 | 2003-12-10 | 学校法人慶應義塾 | Monitoring device |
-
1984
- 1984-07-13 JP JP14659284A patent/JPS6125542A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6125542A (en) | 1986-02-04 |
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