JPH02180244A - Heart magnetism measuring device - Google Patents
Heart magnetism measuring deviceInfo
- Publication number
- JPH02180244A JPH02180244A JP63335591A JP33559188A JPH02180244A JP H02180244 A JPH02180244 A JP H02180244A JP 63335591 A JP63335591 A JP 63335591A JP 33559188 A JP33559188 A JP 33559188A JP H02180244 A JPH02180244 A JP H02180244A
- Authority
- JP
- Japan
- Prior art keywords
- subject
- control device
- top plate
- light source
- test object
- 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.)
- Pending
Links
- 230000005389 magnetism Effects 0.000 title abstract description 3
- 241000238366 Cephalopoda Species 0.000 claims abstract description 8
- 238000005259 measurement Methods 0.000 abstract description 36
- 230000005291 magnetic effect Effects 0.000 description 14
- 230000002159 abnormal effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 9
- 238000001514 detection method Methods 0.000 description 8
- 238000003384 imaging method Methods 0.000 description 3
- 238000013480 data collection Methods 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 208000019622 heart disease Diseases 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000003550 marker Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005481 NMR spectroscopy Methods 0.000 description 1
- 230000011128 cardiac conduction Effects 0.000 description 1
- 230000000747 cardiac effect Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 208000010125 myocardial infarction Diseases 0.000 description 1
Landscapes
- Measuring Magnetic Variables (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
Abstract
Description
この発明は、ＳＱＵＩＤセンサを使用した心磁針測装置
に関する。The present invention relates to a magnetocardial needle measuring device using a SQUID sensor.
生体内の磁気を計測する装置として、近年、５ＱＬＩＩ
Ｄ （Ｓｕｐｅｒｃｏｎｄｕｃｔｉｎｇ Ｑｕａｎｔ
ｕｍ ＩｎｔｅｒｆｅｒｅｎｃｅＤｅｖｉｃｅ：超電
導量子干渉型デバイス）を用いたものが開発され、生体
内の微小な磁界の計測が容易になってきている（トリガ
ー別冊ｐ１５５−１６３．１９８７゜１２月、パリティ
別冊Ｎｏ、 １． ｐ２６−３８．１９８６．メディカ
ルシステムニュースｖｏ１．９ Ｎｏ、４第１００号ρ
２６−２７．１９８８）。
このＳＱＵ Ｉ Ｄは超電導状態を維持するため液体ヘ
リウムで冷却する必要がある。そのため通常、ＳＱＵ
Ｉ Ｄセンサの検出コイルとＳＱＵ Ｉ Ｄユニットと
が、デユワ−と呼ばれる容器中に満たされた液体ヘリウ
ム中に浸されている。
心臓の磁気を計測する場合、被検者の胸の部分にこのデ
ユワ−の底部（底部に検出コイルが配置されている）を
接近させて計測を行なう、これにより、心磁図（心臓の
等磁界図）などを作成して、心臓の疾患の診断を行なう
。In recent years, 5QLII has been used as a device to measure magnetism in living organisms.
D (Superconducting Quant
um Interference Device (Superconducting Quantum Interference Device) has been developed, making it easier to measure minute magnetic fields inside living organisms (Trigger Special Issue p155-163. December 1987, Parity Special Issue No. 1. p26-38.1986. Medical System News vol. 1.9 No. 4 No. 100 ρ
26-27.1988). This SQUID needs to be cooled with liquid helium to maintain its superconducting state. Therefore, usually SQU
The detection coil of the ID sensor and the SQU ID unit are immersed in liquid helium filled in a container called a dewar. When measuring the magnetic field of the heart, the bottom of the dewar (the detection coil is placed at the bottom) is brought close to the subject's chest. Diagnosis of heart disease is performed by creating images such as (Figure).
しかしながら、従来では被検者に対する測定点（デユワ
−位置）の位置関係を正確に把握することが難しく、異
常部位の位置の正確な推定ができないという問題があっ
た。
すなわち、心筋梗塞などを持つ心疾患者と正常者との心
臓の等磁界図のパターン比較のような場合は被検者に対
する測定点の位置関係の精密な測定は必ずしも必要でな
いが、Ｗ Ｐ Ｗ （Ｗｏｊｆｆ−Ｐａｒｋｉｎｓｏｎ
−Ｗｈｉｔｅ） ｇ候群と呼ばれる心臓内伝導系異常部
位の位置推定などの場合は、測定点と被検者との位置関
係の正確な把握ができていないと等磁界図から異常部位
の正確な位置推定ができない。
この発明は、被検者に対する測定点の位置関係を正確に
求めることができる、心磁針測装置を提供することを目
的とする。However, in the past, it was difficult to accurately grasp the positional relationship of the measurement point (dewar position) with respect to the subject, and there was a problem that the position of the abnormal region could not be accurately estimated. In other words, in cases such as comparing patterns of cardiac isomagnetic field diagrams between patients with heart disease such as myocardial infarction and normal subjects, precise measurement of the positional relationship of measurement points with respect to the subject is not necessarily required, but W P W (Wojff-Parkinson
-White) When estimating the location of an abnormal site in the cardiac conduction system called the G cluster, if the positional relationship between the measurement point and the subject is not accurately understood, it is difficult to accurately determine the abnormal site from the isomagnetic field map. Unable to estimate location. SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetocardiographic measuring device that can accurately determine the positional relationship of measurement points with respect to a subject.
上記目的を達成するため、この発明による心磁針測装置
においては、被検者が横たえられるベッド天板と、該ベ
ッド天板を移動させる移動装置と、該ベッド天板の上方
において退避可能に配置される、位置決め用の光ビーム
を発生する光源と、この光源が退避した後その光源が位
置していた位置に固定されるＳＱＵ ＩＤセンサと、上
記移動装置を制御して所定の位置に次々にベッド天板を
位置させる制御装置と、上記ＳＱＵＩＤセンサから得ら
れるデータを上記制御装置からの位置情報とともに収集
する装置とが備えられる。In order to achieve the above object, the magnetocardiographic measuring device according to the present invention includes a bed top on which a subject lies, a moving device for moving the bed top, and a retractable arrangement above the bed top. a light source that generates a light beam for positioning; a SQU ID sensor that is fixed at the position where the light source was located after the light source has retreated; A control device for positioning the bed top plate and a device for collecting data obtained from the SQUID sensor together with position information from the control device are provided.
光源からの光ビームが被検者に取り付けられたマーカ等
の指標に一致するように、被検者が横たわっているベッ
ド天板を移動させる。その後、この光源は退避させられ
、代わりにその位置にＳＱＵＩＤセンサが固定される。
そして、制御装置によって、この位置を基準にしてベッ
ド天板を移動させれば、被検者について予め定めた測定
点において５ＱＵＩ Ｄセンサによる磁気測定を行なう
ことができる。こうして取得したデータは制御装置から
の各測定点を表わす位置情報とともに収集される。
したがって、こうして磁気データとその測定点の位置情
報とが収集されることになり、その位置情報は光源から
の光ビームによって実際に被検者との対応間係がとられ
ているため、正確なものとなる。
その結果、ＳＱＵＩＤセンサによる測定点と被検者との
位置関係が正確に把握されることになるので、これら磁
気データ及び測定点の位置情報より作成した等磁界図か
ら、心臓内伝導系異常部位の位置推定などを正確に行な
うことができる。The bed top on which the subject is lying is moved so that the light beam from the light source matches an index such as a marker attached to the subject. This light source is then retracted and the SQUID sensor is fixed in its place. Then, by moving the bed top using this position as a reference using the control device, magnetic measurements can be performed using the 5QUID sensor at predetermined measurement points for the subject. The data thus obtained is collected together with position information representing each measurement point from the control device. Therefore, magnetic data and position information of the measurement point are collected in this way, and the position information is accurate because it is actually connected to the subject using the light beam from the light source. Become something. As a result, the positional relationship between the measurement point by the SQUID sensor and the subject can be accurately grasped, and from the isomagnetic field map created from these magnetic data and the position information of the measurement point, the abnormal site of the intracardiac conduction system can be determined. It is possible to accurately estimate the position of
つぎにこの発明の一実施例について図面を参照しながら
説明する。第１図において、被検者１はベッド天板２上
に横たえられる。このベッド天板２は天板走査装置、２
１によってＸ方向（被検者１の左右方向）、Ｙ方向（被
検者１の身長方向）及びＺ方向（上下方向）に天板２が
移動させられる。
この天板走査装置２１は制御装置２２によって制御され
る。
この天板走査装置２１は基台３上に設置されており、こ
の基台３には光源４を退避可能に保持するフレーム３１
が固定されている。この光源４は、Ｚ方向の細いペンシ
ル状の光ビーム（ペンシルビーム）４１と、Ｘ−Ｙ平面
内で扇型に広がる薄い光ビーム（スリットビーム）４２
とを照射する。
また、基台３にはスタンド３２が固定されており、この
スタンド３２に上下に昇降するアーム３３が取り付けら
れ、このアーム３３によりデユワ−５が保持される。こ
のデユワ−５内にはＳＱＵ Ｉ Ｄセンサの検出コイル
とＳＱＵ Ｉ Ｄユニットとが納められており、検出コ
イルはその底部に配置される。光源４が退避させられた
後、その光源４のもとの位置にデユワ−５の底面が位置
するようにアーム３３が降りてくる。
そして、制御装置２２によって天板走査装置２１が制御
され、被検者１が移動させられてデユワ−５の底面が被
検者１の予め決められている測定点に次々に位置決めさ
れる。こうしてＳＱＵ Ｉ Ｄセンサにより被検者１の
各測定点での磁気計測が行なわれ、その測定データはデ
ータ収集袋ｆ６及びデータ処理装置７を経て記録装ｆ８
に記録される。この測定データとともに制御装置２２か
らの測定点の位置情報が記録装Ｒ８に記録される。っぎ
にデータ処理装置７がこの記録されたデータを読み出し
、処理を加えることにより等磁界図等が作成され、これ
が表示装置９に表示される。また、ＭＲＩ装！（核磁気
共鳴を利用したイメージング装置）１０によって撮像し
た同じ被検者１に間する断層像がデータ処理装置７に送
られ、このデータ処理装置７によって断層像上で異常部
位等の推定等が行なわれ、その位置を表わす断層像の表
示等も表示袋Ｗ９により行なわれる。
実際の操作を１つの測定例について説明すると、まず、
第２図に示すように被検者１の心臓輪郭が１点鎖線１２
で示されるようであるとして、それをカバーする範囲を
断層撮像範囲１３とし、その範囲１３内でＭＲＩ装置１
０により多数の適当な厚さの断層像（Ｘ−Ｚ平面に平行
な断層面での像）の撮像を心電同期により予め行なって
おく、そして、この断層面の１つ、たとえば撮像範囲１
３の端に位置する１つの断層面上において被検者１の体
表面に指標となるマーカ１１をいくつか貼りつけておい
て、この断層面での断層像にこれらのマーカ１１が写る
ようにしておく。
その後、光源４のペンシルビーム４１のＸ−Ｙ座標とデ
ユワ−５内の検出コイル中心軸とが一致し、且つ検出コ
イル中心軸がＺ軸に一致するようにデユワ−５を保持す
るアーム３３を調整する。
次に、天板２（及び被検者ｌ）をＸ方向及びＹ方向に移
動させて、光源４からのスリットビーム４２が被検者１
の複数のマーカ１１を照射するようにする。このときの
光源４のＸ、Ｙ座標が天板走査装置２１により天板２の
位置から読み取られる。
また、光源４のＺ座標（被検者１との間の距Ｍ）はマニ
ュアル測定により得る。こうして基準位置のＸ、Ｙ、Ｚ
座標が制御装置２２に入力される。
つぎに、予め定まっている測定点を被検者１の体表面に
描き、その各測定点をペンシルビーム４１が照射するよ
うに天板２を移動させる。この測定点はたとえば第３図
の格子点として定められる。
この第３図に示す測定点は、内角他「正常、異常者の心
磁図の５ＱＵＡＲＥ ＭＡＰ表示」 （マグネティッ
クス研究会資料、ＭＡＧ−８３−３４，１９８３年２月
１１日）によっている。こうして全測定点のそれぞれの
Ｘ、Ｙ位置情報（上記基準位置からのＸ、Ｙ距離）が制
御袋！２２に取り込まれる。
これにより、測定点の被検者１に対する位置が正確に得
られ、且つ測定点と多数のＭＲ断層像（３次元ＭＲデー
タ）との位置関係も正確に対応できることになる。
その後、光源４はデユワ−５の下から退避させられ、デ
ユワ−５が降りてきて光源４が位置していた位置にデユ
ワ−５の底部（検出コイルが配置された部分）が位置さ
せられる。こうした状態で、制御装置２２により、デユ
ワ−５の底部がさきに入力された測定点の各々に位置す
るよう天板操作袋２２１の制御が行なわれ、各測定点に
おけるＳＱＵ Ｉ Ｄセンサによる磁気測定が次々に行
なわれる。得られた磁気データとその測定点の位置情報
とが順次記録装置１１ｆ８に記録されていき、すべての
測定点でのデータの記録が終了した後、データ処理装置
７がこのデータを読み出して処理を行い、第４図に示す
ような等磁界図が作成され、この画像が表示装置９によ
り表示される。この第４図の等磁界図において、＋は紙
面に対し垂直に裏面方向に向かう磁界の極値を、−は紙
面に対し垂直に裏面から表面側に向かう磁界の極値をそ
れぞれ示し、矢印→が示された位置に電流双極子が存在
しているものと推定される。さらにＭＨＩ装２１０から
の３次元ＭＲデータをデータ処理装置７に入力し、上記
の等磁界図より推定した異常部位の位置をＭＲ断層像上
において表示するとたとえば第５図のようになる。この
第５図でｘ印が異常部位の位置であり、中心から左方向
（Ｘ方向）に距離ａで、検出コイル面から下方（Ｚ方向
）に距ｘｂとなっている。これが表示装置９において表
示される。
なお、上記では被検者１の内部組織の３次元データをＭ
Ｒ１装置１０から得ているが、Ｘ線ＣＴ装置からの３次
元ＣＴデータを用いることもできる。Next, an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, a subject 1 is lying on a bed top 2. This bed top plate 2 includes a top plate scanning device, 2
1, the top plate 2 is moved in the X direction (horizontal direction of the subject 1), Y direction (height direction of the subject 1), and Z direction (vertical direction). This top scanning device 21 is controlled by a control device 22. This top plate scanning device 21 is installed on a base 3, and a frame 31 that holds the light source 4 in a retractable manner is mounted on the base 3.
is fixed. This light source 4 includes a thin pencil-shaped light beam (pencil beam) 41 in the Z direction and a thin light beam (slit beam) 42 that spreads fan-shaped in the X-Y plane.
irradiate with. Further, a stand 32 is fixed to the base 3, and an arm 33 that moves up and down is attached to this stand 32, and the dewar 5 is held by this arm 33. A detection coil of a SQU ID sensor and a SQU ID unit are housed in this dewar 5, and the detection coil is arranged at the bottom thereof. After the light source 4 is evacuated, the arm 33 descends so that the bottom surface of the dewar 5 is located at the original position of the light source 4. The top plate scanning device 21 is then controlled by the control device 22, the subject 1 is moved, and the bottom surface of the dewar 5 is successively positioned at predetermined measurement points on the subject 1. In this way, the SQU I D sensor performs magnetic measurement at each measurement point of the subject 1, and the measurement data is sent to the recording device f8 via the data collection bag f6 and the data processing device 7.
recorded in Along with this measurement data, the position information of the measurement point from the control device 22 is recorded in the recording device R8. Then, the data processing device 7 reads out this recorded data and processes it to create an equal magnetic field diagram, etc., which is displayed on the display device 9. Also, MRI equipment! (Imaging device using nuclear magnetic resonance) A tomographic image of the same subject 1 imaged by 10 is sent to data processing device 7, and this data processing device 7 estimates abnormal areas etc. on the tomographic image. The display bag W9 also displays a tomographic image representing the position. To explain the actual operation using one measurement example, first,
As shown in FIG. 2, the heart contour of subject 1 is
, the range that covers it is defined as the tomographic imaging range 13, and within that range 13, the MRI apparatus 1
0, a large number of tomographic images (images on tomographic planes parallel to the
Several markers 11 serving as indicators are pasted on the body surface of the subject 1 on one tomographic plane located at the edge of 3, and these markers 11 are made to appear in the tomographic image on this tomographic plane. I'll keep it. After that, the arm 33 that holds the dewar 5 is moved so that the X-Y coordinates of the pencil beam 41 of the light source 4 and the central axis of the detection coil in the dewar 5 coincide with each other, and the central axis of the detection coil coincides with the Z axis. adjust. Next, the top plate 2 (and the subject 1) is moved in the X direction and the Y direction so that the slit beam 42 from the light source 4
A plurality of markers 11 are irradiated. The X and Y coordinates of the light source 4 at this time are read from the position of the top plate 2 by the top plate scanning device 21. Further, the Z coordinate of the light source 4 (distance M from the subject 1) is obtained by manual measurement. In this way, the reference position X, Y, Z
The coordinates are input to the control device 22. Next, predetermined measurement points are drawn on the body surface of the subject 1, and the top plate 2 is moved so that each measurement point is irradiated with the pencil beam 41. This measurement point is determined, for example, as a grid point in FIG. The measurement points shown in FIG. 3 are based on Uikami et al.'s ``5QUARE MAP display of magnetocardiograms of normal and abnormal subjects'' (Magnetics Study Group material, MAG-83-34, February 11, 1983). In this way, the X, Y position information (X, Y distance from the above reference position) of all measurement points is controlled! 22. As a result, the position of the measurement point relative to the subject 1 can be accurately obtained, and the positional relationship between the measurement point and a large number of MR tomographic images (three-dimensional MR data) can also be accurately matched. Thereafter, the light source 4 is retracted from under the dewar 5, and the dewar 5 is lowered so that the bottom of the dewar 5 (the part where the detection coil is located) is located at the position where the light source 4 was located. In this state, the control device 22 controls the top panel operation bag 221 so that the bottom of the dewar 5 is located at each of the previously input measurement points, and the magnetic measurement by the SQU ID sensor at each measurement point is performed. are carried out one after another. The obtained magnetic data and the position information of the measurement points are sequentially recorded in the recording device 11f8, and after the recording of data at all the measurement points is completed, the data processing device 7 reads out this data and processes it. Then, an equal magnetic field diagram as shown in FIG. 4 is created, and this image is displayed on the display device 9. In the isomagnetic field diagram in Fig. 4, + indicates the extreme value of the magnetic field that goes perpendicular to the paper surface toward the back surface, and - indicates the extreme value of the magnetic field that goes perpendicular to the paper surface from the back surface toward the front surface. It is presumed that a current dipole exists at the position indicated by . Furthermore, the three-dimensional MR data from the MHI system 210 is input to the data processing device 7, and the position of the abnormal region estimated from the above-mentioned isomagnetic field map is displayed on the MR tomographic image as shown in FIG. 5, for example. In FIG. 5, the x mark indicates the position of the abnormal region, which is a distance a from the center to the left (X direction) and a distance xb downward (Z direction) from the detection coil surface. This is displayed on the display device 9. In addition, in the above, the three-dimensional data of the internal tissue of subject 1 is
Although the data is obtained from the R1 device 10, three-dimensional CT data from an X-ray CT device can also be used.
この発明の心磁針測装置によれば、ＳＱＵ Ｉ Ｄセン
サによる測定点と被検者との位置関係が正確に把握され
ることになるので、これら磁気測定データ及び測定点の
位置情報より作成した等磁界図から、心臓内伝導系異常
部位等の疾患の位置を正確に求めることが可能となる。According to the magnetocardiographic measuring device of the present invention, the positional relationship between the measurement point by the SQU I D sensor and the subject can be accurately grasped. From the isomagnetic field map, it is possible to accurately locate a disease such as an abnormal site of the intracardiac conduction system.
第１図はこの発明の一実施例のブロック図、第２図は被
検者に取り付けたマーカ位置を示す模式図、第３図は測
定点を例示する模式図、第４図は等磁界図を例示する図
、第５図はＭＲ断層像上で推定された疾患位置を表わす
図である。
１・・・被検者、１１・・・マーカ、１２・・・心臓輪
郭、１３・・・断層撮像範囲、２・・・ベッド天板、２
１・・・天板走査装置、２２・・・制御装置、３・・・
基台、３１・・・フレーム、３２・・・スタンド、３３
・・・アーム、４・・・光源、４１・・・ペンシルビー
ム、４２・・・スリットビーム、５・・・デユワ−１６
・・・データ収集装置、７・・・データ処理装置、８・
・・記録装置、９・・・表示装置、１０・・・ＭＨＩ装
置。Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a schematic diagram showing the positions of markers attached to the subject, Fig. 3 is a schematic diagram illustrating measurement points, and Fig. 4 is an equal magnetic field diagram. FIG. 5 is a diagram showing a disease position estimated on an MR tomographic image. 1... Subject, 11... Marker, 12... Heart contour, 13... Tomographic imaging range, 2... Bed top plate, 2
1... Top plate scanning device, 22... Control device, 3...
Base, 31... Frame, 32... Stand, 33
...Arm, 4...Light source, 41...Pencil beam, 42...Slit beam, 5...Dewar-16
... data collection device, 7... data processing device, 8.
...Recording device, 9...Display device, 10...MHI device.
Claims (1)
板を移動させる移動装置と、該ベッド天板の上方におい
て退避可能に配置される、位置決め用の光ビームを発生
する光源と、この光源が退避した後その光源が位置して
いた位置に固定されるＳＱＵＩＤセンサと、上記移動装
置を制御して所定の位置に次々にベッド天板を位置させ
る制御装置と、上記ＳＱＵＩＤセンサから得られるデー
タを上記制御装置からの位置情報とともに収集する装置
とを有することを特徴とする心磁計測装置。(1) A bed top on which a subject lies, a moving device that moves the bed top, and a light source that generates a positioning light beam that is retractably arranged above the bed top; A SQUID sensor that is fixed at the position where the light source was located after the light source has evacuated; a control device that controls the moving device to position the bed tops one after another at predetermined positions; 1. A magnetocardiocardial measuring device comprising: a device for collecting data from the controller along with positional information from the control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63335591A JPH02180244A (en) | 1988-12-29 | 1988-12-29 | Heart magnetism measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63335591A JPH02180244A (en) | 1988-12-29 | 1988-12-29 | Heart magnetism measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02180244A true JPH02180244A (en) | 1990-07-13 |
Family
ID=18290299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63335591A Pending JPH02180244A (en) | 1988-12-29 | 1988-12-29 | Heart magnetism measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02180244A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04117945A (en) * | 1990-09-07 | 1992-04-17 | Daikin Ind Ltd | Plane tomography image interpolation display device |
| WO1999049781A1 (en) * | 1998-03-27 | 1999-10-07 | Hitachi, Ltd. | Apparatus for magnetic measurement of living body, and method of positioning person under examination |
| JP2001299714A (en) * | 1999-10-06 | 2001-10-30 | Hitachi Ltd | Method for measuring biological magnetic field |
| JP2001299715A (en) * | 1999-10-06 | 2001-10-30 | Hitachi Ltd | Biological magnetic field measuring instrument |
| JP2001321349A (en) * | 1999-10-06 | 2001-11-20 | Hitachi Ltd | Positioning method of subject for biomagnetism measurement |
| US6522908B1 (en) | 1999-10-06 | 2003-02-18 | Hitachi, Ltd. | Biomagnetic field measuring apparatus |
| JP2008029459A (en) * | 2006-07-27 | 2008-02-14 | Hitachi High-Technologies Corp | Bio-magnetic field measuring instrument and measurement position setting method for bio-magnetic field measuring instrument |
-
1988
- 1988-12-29 JP JP63335591A patent/JPH02180244A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04117945A (en) * | 1990-09-07 | 1992-04-17 | Daikin Ind Ltd | Plane tomography image interpolation display device |
| WO1999049781A1 (en) * | 1998-03-27 | 1999-10-07 | Hitachi, Ltd. | Apparatus for magnetic measurement of living body, and method of positioning person under examination |
| US6628978B1 (en) | 1998-03-27 | 2003-09-30 | Hitachi, Ltd. | Biomagnetism measurement device and method of biomagnetism measurement using the device |
| JP2001299714A (en) * | 1999-10-06 | 2001-10-30 | Hitachi Ltd | Method for measuring biological magnetic field |
| JP2001299715A (en) * | 1999-10-06 | 2001-10-30 | Hitachi Ltd | Biological magnetic field measuring instrument |
| JP2001321349A (en) * | 1999-10-06 | 2001-11-20 | Hitachi Ltd | Positioning method of subject for biomagnetism measurement |
| US6522908B1 (en) | 1999-10-06 | 2003-02-18 | Hitachi, Ltd. | Biomagnetic field measuring apparatus |
| JP2008029459A (en) * | 2006-07-27 | 2008-02-14 | Hitachi High-Technologies Corp | Bio-magnetic field measuring instrument and measurement position setting method for bio-magnetic field measuring instrument |
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