JPH0482535A - Magnetic resonance imaging apparatus - Google Patents

Magnetic resonance imaging apparatus

Info

Publication number
JPH0482535A
JPH0482535A JP2063024A JP6302490A JPH0482535A JP H0482535 A JPH0482535 A JP H0482535A JP 2063024 A JP2063024 A JP 2063024A JP 6302490 A JP6302490 A JP 6302490A JP H0482535 A JPH0482535 A JP H0482535A
Authority
JP
Japan
Prior art keywords
concave mirror
magnetic resonance
resonance imaging
subject
inspected
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
Application number
JP2063024A
Other languages
Japanese (ja)
Inventor
Yasuhiro Yamagishi
山岸 靖宏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Canon Medical Systems Corp
Original Assignee
Toshiba Corp
Toshiba Medical Systems Engineering Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Toshiba Medical Systems Engineering Co Ltd filed Critical Toshiba Corp
Priority to JP2063024A priority Critical patent/JPH0482535A/en
Publication of JPH0482535A publication Critical patent/JPH0482535A/en
Pending legal-status Critical Current

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  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

PURPOSE:To relieve a person to be inspected of pains by a method wherein a reflection means which is arranged at a position recognizable visually by a person to be inspected within a frame base and projects information shown on a display section located outside the frame base is made up of a concave mirror so that the person to be inspected is allowed to learn information on residual time of photographing or the like visually without affecting a tomographic image. CONSTITUTION:A concave mirror 8 is held free to rotate with a fixed half- circular arc frame 9 with both ends thereof fixed on a top board 4 and extending across the width of the top board 4 along a side wall of a void 3. As regard to the concave mirror 8, it is desired that a substrate forming a reflection surface thereof is not made of metal to eliminate adverse effect on a magnetic resonance signal and a magnetic field. In a magnetic resonance imaging apparatus 1 of such a type, a person P to be inspected lying on the top board 4 during the photographing of an tomographic image can learn residual time of photographing displayed on a timepiece 7 accurately through the concave mirror 8 by a visual recognition as given by an optical path L.

Description

【発明の詳細な説明】 [発明の目的〕 (産業上の利用分野) 本発明は、核磁気共鳴(N M R; Nuclear
Magnetic Re5onance)現象を応用し
た磁気共鳴イメージング装置に係わり、特に、撮影の残
時間等の情報を被検者に提供する表示装置を備えた磁気
共鳴イメージング装置に関する。
[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to nuclear magnetic resonance (NMR)
The present invention relates to a magnetic resonance imaging apparatus that applies the (Magnetic Resonance) phenomenon, and particularly relates to a magnetic resonance imaging apparatus equipped with a display device that provides information such as the remaining time for imaging to a subject.

(従来の技術) 核磁気共鳴現象は、磁場中におかれた原子核が特定波長
の電磁波エネルギーを共鳴吸収して、次いでこのエネル
ギーを電磁波として放出する現象である。この現象を利
用して生体の診断を行う装置は、上述の原子核、特に、
プロトンから放出される電磁波を検知して、検知された
信号を処理して、原子核(プロトン)密度、縦緩和時間
T1、横緩和時間T2、流れ、化学シフト等の情報が反
映された被検者の断層像等の診断情報が得られる。
(Prior Art) Nuclear magnetic resonance is a phenomenon in which atomic nuclei placed in a magnetic field resonate and absorb electromagnetic wave energy of a specific wavelength, and then emit this energy as electromagnetic waves. Devices that utilize this phenomenon to diagnose living organisms use the above-mentioned atomic nuclei, especially
A test subject that detects electromagnetic waves emitted from protons and processes the detected signals to reflect information such as nuclear (proton) density, longitudinal relaxation time T1, transverse relaxation time T2, flow, chemical shift, etc. Diagnostic information such as tomographic images can be obtained.

ところで、この様な核磁気共鳴現象を利用した磁気共鳴
イメージング装置を用いて被検者の断層像により診断を
行う場合、正確な診断を行うためには、ある程度長い時
間を要する。しかも、この時間の間、被検者はイメージ
ング装置の架台内で静止している必要があり、被検者に
は苦痛を伴う。
By the way, when making a diagnosis using a tomographic image of a subject using a magnetic resonance imaging apparatus that utilizes such a nuclear magnetic resonance phenomenon, it takes a certain amount of time to make an accurate diagnosis. Moreover, during this time, the subject must remain stationary within the cradle of the imaging apparatus, which is painful for the subject.

撮影の残時間は、被検者が横臥している磁気共鳴イメー
ジング装置の架台が配置されている所とは隔離された部
屋に配置されているコンソール上の表示装置に表示され
てオペレータは知ることができる。しかし、被検者には
、磁気共鳴イメージング装置の磁場の影響が少ない場所
、例えば、1m以上離れた場所に設置された時計を架台
内に設置された平面鏡を通じて知らされるにすぎない。
The remaining time for imaging is displayed on a display device on a console that is located in a room separate from where the magnetic resonance imaging device stand where the patient is lying is located, so that the operator can know. I can do it. However, the subject is only informed of the clock, which is placed at a location less affected by the magnetic field of the magnetic resonance imaging apparatus, for example, at a distance of 1 m or more, through a plane mirror installed in the mount.

平面鏡に写し出された時計は、小さく認識しずらい。A clock reflected in a plane mirror is small and difficult to recognize.

そのために、被検者の苦痛を助長する要因となっていた
For this reason, it became a factor that aggravated the suffering of the examinee.

米国特許節4.650 、299号公報には、架台の空
所内の天井に固定された第1の平面鏡と、被検者が横臥
する天板に固定された第2の平面鏡とを有する観察装置
を備えた磁気共鳴イメージング装置が示されている。こ
の観察装置は、架台の狭い空所にいる被検者が観察者の
表情等の外界の様子を見ることを可能にしたものである
U.S. Pat. A magnetic resonance imaging apparatus is shown. This observation device allows the subject in the narrow space of the gantry to see the outside world, such as the observer's facial expressions.

しかしながら、平面鏡を通した外界の観察、例えば、時
計は小さく写し出されるに過ぎず、非常に認識しすらい
However, when observing the outside world through a plane mirror, for example, a clock is only reflected in a small image and is very difficult to recognize.

(発明が解決しようとする課題) 上述したように、従来の磁気共鳴イメージング装置では
、被検者が撮影の残時間を容易に知ることができず、撮
影中の静止状態を保持する苦痛をさらに助長する不都合
かあった。
(Problems to be Solved by the Invention) As described above, with conventional magnetic resonance imaging devices, subjects cannot easily know the remaining time for imaging, which further increases the pain of maintaining a still state during imaging. There were some inconveniences that helped.

本発明の目的は、被検者に対して撮影の残時間等の情報
を、断層像に対して影響を与えずに、視覚的に知らせる
ことができて、被検者の苦痛を軽減できる磁気共鳴イメ
ージング装置を提供することにある。
The object of the present invention is to provide a magnetic field that can visually inform the patient of information such as the remaining time of imaging without affecting the tomographic image, and can reduce the patient's pain. An object of the present invention is to provide a resonance imaging device.

[発明の構成] (課題を解決するための手段) 本発明は、被検者に印加される静磁場を発生する静磁場
発生コイルおよび磁気共鳴信号が誘起された部位の位置
情報を得るための傾斜磁場を発生する傾斜磁場発生コイ
ルを収納する架台と、この架台の空所内に被検者を横臥
させるだめの天板とを備えた磁気共鳴イメージング装置
において、前記架台内であって被検者が目視できる位置
に配置されると共に前記架台の外部に位置する表示部に
表示された情報を写す反射手段を有し、この反射手段が
凹面鏡から構成されることを特徴とする磁気共鳴イメー
ジング装置である。
[Structure of the Invention] (Means for Solving the Problems) The present invention provides a static magnetic field generating coil that generates a static magnetic field to be applied to a subject, and a method for obtaining positional information of a site where a magnetic resonance signal is induced. In a magnetic resonance imaging apparatus comprising a pedestal for storing a gradient magnetic field generating coil that generates a gradient magnetic field, and a top plate for allowing a subject to lie down in a space in the pedestal, A magnetic resonance imaging apparatus characterized in that the magnetic resonance imaging apparatus has a reflecting means arranged at a position where it can be seen visually and reflects information displayed on a display section located outside the mount, and the reflecting means is composed of a concave mirror. be.

(作 用) 本発明の磁気共鳴イメージング装置では、架台の外側に
配置された時計等の表示装置に表示される撮影の残時間
等の情報を写す凹面鏡を架台内であって被検者が目視で
きる位置に配置することにより、被検者から離れた位置
の時計の像が小さくなることなく、被検者が残時間を正
確に認識することができる。その結果、被検者が撮影の
残時間等の情報を知ることができ、撮影中の苦痛を軽減
することができる。
(Function) In the magnetic resonance imaging apparatus of the present invention, a concave mirror that reflects information such as the remaining time for imaging displayed on a display device such as a clock placed outside the mount is placed inside the mount so that the subject can visually see it. By arranging the watch in a position where it is possible to do so, the image of the clock at a position far from the patient does not become small, and the patient can accurately recognize the remaining time. As a result, the subject can know information such as the remaining time for imaging, and pain during imaging can be alleviated.

本発明の反射手段は、架台の外に配置された時計が凹面
鏡全体に写し出されるためには、焦点距離が15(2)
乃至40CII+の凹面鏡から構成することが好ましい
。これは、以下の理由による。第1図において示す様に
、磁気共鳴イメージング装置(1)の架台(2)内の被
検者(P)の目と凹面鏡(8)との距離をa1凹面鏡の
幅をdとして、凹面鏡(8)の焦点距離fの範囲を求め
る。第1図において、(6)は、架台(2〉内の静磁場
発生コイルから発生される静磁場の影響が少なくなる位
置に設置された時計である。この凹面鏡(8)の焦点距
離fの範囲を第2図を用いて求める。第2図において、
被検者の目の位置をA、凹面鏡の中心を01凹面鏡の一
端を81凹面鏡の焦点をF1凹面鏡の一端Bに入射する
平行光線をC1時計(6ンの一端から凹面鏡の一端Bに
入射する光線をDとする。第2図において、FO−f、
AO−a、BO−d/2を用いて、ZBAO−θ、ZB
FOl−ψを示すと、以下の(1)式および(2)式で
表わされる。
The reflecting means of the present invention has a focal length of 15 (2) in order for the clock placed outside the mount to be reflected on the entire concave mirror.
It is preferable to use a concave mirror of 40 CII+ to 40 CII+. This is due to the following reasons. As shown in FIG. 1, the distance between the eyes of the subject (P) in the stand (2) of the magnetic resonance imaging apparatus (1) and the concave mirror (8) is a1, and the width of the concave mirror is d. ) Find the range of the focal length f. In Fig. 1, (6) is a clock installed in a position where the influence of the static magnetic field generated from the static magnetic field generating coil in the mount (2) is reduced.The focal length f of this concave mirror (8) is Find the range using Figure 2. In Figure 2,
The subject's eye position is A, the center of the concave mirror is 01, one end of the concave mirror is 81, the focal point of the concave mirror is F1, the parallel ray is incident on one end B of the concave mirror, and the parallel ray is incident on one end B of the concave mirror from one end of the concave mirror. Let the ray be D. In Fig. 2, FO-f,
Using AO-a, BO-d/2, ZBAO-θ, ZB
FOl-ψ is expressed by the following equations (1) and (2).

θ−t a n−1(d / 2a) −・−・−(1
)ψ−t a n’ (d/2f) −・−−−−(2
)Cの平行光線は、凹面鏡の焦点Fを通る。従って、時
計の全体が凹面鏡に写し出されるためには、時計の一端
からの光りは、Bで反射してAを通り、以下の(3)式
の関係が成り立つ。
θ−tan−1(d/2a) −・−・−(1
) ψ−t a n' (d/2f) −・−−−−(2
) The parallel rays of C pass through the focal point F of the concave mirror. Therefore, in order for the entire watch to be reflected on the concave mirror, the light from one end of the watch is reflected by B and passes through A, and the following equation (3) holds true.

ZDBC−ZFBA−θ−ψ・・・・・・(3)また、
(4)式の関係も成り立つ。
ZDBC-ZFBA-θ-ψ (3) Also,
The relationship in equation (4) also holds true.

ZcBA−ZBAO−θ・・・・・・(4)ここで、凹
面鏡の拡大率をkとすると、上記(3)式および(4)
式から(5)式の関係か成り立つ。
ZcBA-ZBAO-θ... (4) Here, if the magnification of the concave mirror is k, then the above equation (3) and (4)
From the equation, the relationship of equation (5) holds true.

k(θ−ψ)−θ・・・・・・(5) この(1)式、(2)式および(5)式により、a−1
0(2)、d−20cmとし、拡大率を3 (k−3)
として、焦点距離を求めると、f−17,30fllと
なる。同様に、k−1,5のときはf −37cm、 
k =4のときはf−15cm+となる。従って、拡大
率として、1,5から4倍程度とすれば、凹面鏡の焦点
距離は、15cmから40cm+の範囲となる。
k(θ−ψ)−θ・・・・・・(5) By these equations (1), (2), and (5), a-1
0(2), d-20cm, magnification rate 3 (k-3)
, the focal length is f-17, 30fl. Similarly, when k-1,5, f -37cm,
When k = 4, it becomes f-15cm+. Therefore, if the magnification is about 1.5 to 4 times, the focal length of the concave mirror will be in the range of 15 cm to 40 cm+.

(実施例) 以下、本発明の実施例を図面を参照して説明する。第1
図は、本発明の実施例に用いられる磁気共鳴イメージン
グ装置の構成を示す側面図である。第1図に示す様に、
この磁気共鳴イメージング装置(1〉は、被検者(P)
に印加される静磁場を発生する静磁場発生コイルおよび
磁気共鳴信号が誘起された部位の位置情報を得るための
傾斜磁場を発生するための傾斜磁場発生コイルを収納し
、強化炭素繊維からなるカバーで包囲された架台(2)
を有する。また、この装置(1)は、架台(2)の断面
円形状の空所(3)内に被検者(P)を横臥するための
天板(4)を有する。この天板(4)は、寝台(5)に
より、空所(3)内外に自由に移動できる。
(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
The figure is a side view showing the configuration of a magnetic resonance imaging apparatus used in an embodiment of the present invention. As shown in Figure 1,
This magnetic resonance imaging device (1) is for the subject (P).
A cover made of reinforced carbon fiber houses a static magnetic field generating coil that generates a static magnetic field that is applied to the area, and a gradient magnetic field generating coil that generates a gradient magnetic field that obtains position information of the site where the magnetic resonance signal is induced. Frame surrounded by (2)
has. The apparatus (1) also has a top plate (4) on which the subject (P) lies in a hollow space (3) having a circular cross section in the pedestal (2). This top plate (4) can be freely moved into and out of the empty space (3) by means of the bed (5).

この寝台(5)は、被検者(P)が天板(4)の上に乗
るときに、被検者(P)の体格に応じてその高さを油圧
により変えることができる。
The height of this bed (5) can be changed by hydraulic pressure according to the physique of the subject (P) when the subject (P) rides on the top plate (4).

この装置(1)か配置された部屋の壁面(6)には、架
台(2)から発生する磁場の影響が少ない場所に撮影の
残時間を示す時計(7)が掛けられている。
A clock (7) indicating the remaining time for imaging is hung on the wall (6) of the room where this device (1) is placed in a place where the influence of the magnetic field generated from the mount (2) is small.

また、架台(2)内には、被検者(P)が時計(7)を
目視できる位置に、被検者(P)と約10備の距離をお
いて、幅が約20cmの凹面鏡(8)が配置されている
。この凹面鏡(8)は、天板(4)に両端が固定され、
空所(3)の側壁に沿って天板(4)の幅方向に延在す
る半円弧状の固定フレーム(9)により、回動自在に保
持されている。
In addition, a concave mirror (approximately 20 cm wide) is placed in the pedestal (2) at a distance of approximately 10 cm from the examinee (P) in a position where the examinee (P) can visually see the clock (7). 8) is located. This concave mirror (8) has both ends fixed to the top plate (4),
It is rotatably held by a semicircular arc-shaped fixed frame (9) extending in the width direction of the top plate (4) along the side wall of the cavity (3).

この凹面鏡(8)は、第3図に示す様に、固定フレーム
(9)に対して、一端(8a)付近を支持された軸(l
O)を中心として、回動自在に保持されている。
As shown in FIG.
It is rotatably held around O).

また、この凹面鏡(8)の他端(8b)付近には、凹面
鏡(8)の角度ωを調整する調整棒(11)の一端が取
り付けられている。この調整棒(II)の周面にはねじ
が切られて、調整棒(11)の他端が固定フレーム(1
8)に設けられたねじ込み台(12)に螺合している。
Further, one end of an adjustment rod (11) for adjusting the angle ω of the concave mirror (8) is attached near the other end (8b) of the concave mirror (8). A thread is cut on the circumferential surface of this adjustment rod (II), and the other end of the adjustment rod (11) is connected to the fixed frame (1).
It is screwed into a screw base (12) provided in 8).

従って、この調整棒(11)を回転させて調整棒(11
)の長さを変えることにより、被検者(P)の体格に応
じて、凹面鏡(8)の角度ωが変えられる。この調整角
度は、幅約20cmの凹面鏡(8)の場合その厚さは約
1〜2(2)となり、その形状は平面鏡に近いので、微
妙である。従って、この調整角度は、凹面鏡(8)の角
度ωを45°±5°の範囲で十分である。
Therefore, by rotating this adjustment rod (11),
), the angle ω of the concave mirror (8) can be changed depending on the physique of the subject (P). This adjustment angle is delicate because in the case of a concave mirror (8) with a width of about 20 cm, the thickness is about 1 to 2 (2) and its shape is close to that of a plane mirror. Therefore, this adjustment angle is sufficient if the angle ω of the concave mirror (8) is within the range of 45°±5°.

この凹面鏡(8)は、磁気共鳴信号や磁場に対して悪影
響を与えないために、反射面を形成する基板は金属製で
ないことが望ましい。
In order for this concave mirror (8) to have no adverse effect on magnetic resonance signals or magnetic fields, it is desirable that the substrate forming the reflective surface is not made of metal.

この様な、磁気共鳴イメージング装置(1)において、
第1図に示す様に、断層像の撮影中に天板(4)上に横
臥している被検者(P)は、光路(L)の如く、時計(
7)に表示された撮影の残時間を凹面鏡(8)を介して
視認することにより、正しく知ることができる。
In such a magnetic resonance imaging apparatus (1),
As shown in Fig. 1, the subject (P) lying down on the table top (4) during tomographic imaging is placed in the direction of the clock (like the optical path (L)).
By visually confirming the remaining time of imaging displayed in 7) through the concave mirror (8), it is possible to accurately know the remaining time for imaging.

[発明の効果コ 以上の様に、本発明によれば、被検者に対して撮影の残
時間等の情報を、断層像に対して影響を与えずに、視角
的に知らせることができて、被検者の苦痛を軽減できる
磁気共鳴イメージング装置を提供することができる。
[Effects of the Invention] As described above, according to the present invention, information such as the remaining time for imaging can be visually informed to the subject without affecting the tomographic image. , it is possible to provide a magnetic resonance imaging apparatus that can alleviate the pain of a subject.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の実施例による磁気共鳴イメージング装
置を示す側面図、第2図は第1図の凹面鏡の作用を示す
断面図、第3図は第1図の凹面鏡の保持構造を示す断面
図である。 1・・・磁気共鳴イメージング装置、 2・・・架台、     3・・・空所、4・・・天板
、      5・・・寝台、6・・・壁面、    
 7・・・時計、8・・・凹面鏡、     9・・・
固定アーム、10・・・軸、      11・・・調
整棒、12・・・ねじ込み台。
FIG. 1 is a side view showing a magnetic resonance imaging apparatus according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing the function of the concave mirror shown in FIG. 1, and FIG. 3 is a cross-sectional view showing the holding structure of the concave mirror shown in FIG. 1. It is a diagram. DESCRIPTION OF SYMBOLS 1... Magnetic resonance imaging device, 2... Frame, 3... Blank space, 4... Top plate, 5... Bed, 6... Wall surface,
7...Clock, 8...Concave mirror, 9...
Fixed arm, 10...axis, 11...adjustment rod, 12...screw base.

Claims (1)

【特許請求の範囲】[Claims] 被検者に印加される静磁場を発生する静磁場発生コイル
および磁気共鳴信号が誘起された部位の位置情報を得る
ための傾斜磁場を発生する傾斜磁場発生コイルを収納す
る架台と、この架台の空所内に被検者を横臥させるため
の天板とを備えた磁気共鳴イメージング装置において、
前記架台内であって被検者が目視できる位置に配置され
ると共に前記架台の外部に位置する表示部に表示された
情報を写す反射手段を有し、この反射手段が凹面鏡から
構成されることを特徴とする磁気共鳴イメージング装置
A pedestal for housing a static magnetic field generating coil that generates a static magnetic field to be applied to a subject and a gradient magnetic field generating coil that generates a gradient magnetic field for obtaining positional information of a region where a magnetic resonance signal is induced; In a magnetic resonance imaging apparatus comprising a top plate for allowing a subject to lie down in a vacant space,
A reflecting means is disposed within the mount at a position where the subject can see it and reflects information displayed on a display section located outside the mount, and the reflecting means is composed of a concave mirror. A magnetic resonance imaging device featuring:
JP2063024A 1990-03-14 1990-03-14 Magnetic resonance imaging apparatus Pending JPH0482535A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2063024A JPH0482535A (en) 1990-03-14 1990-03-14 Magnetic resonance imaging apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2063024A JPH0482535A (en) 1990-03-14 1990-03-14 Magnetic resonance imaging apparatus

Publications (1)

Publication Number Publication Date
JPH0482535A true JPH0482535A (en) 1992-03-16

Family

ID=13217345

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2063024A Pending JPH0482535A (en) 1990-03-14 1990-03-14 Magnetic resonance imaging apparatus

Country Status (1)

Country Link
JP (1) JPH0482535A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001022108A1 (en) * 1999-09-23 2001-03-29 Koninklijke Philips Electronics N.V. Magnetic resonance imaging apparatus including a comfort zone
US6802767B2 (en) 2000-04-10 2004-10-12 Yoshiaki Kanaya Local exhausting and ventilating methods, and local exhausting device and local ventilating system
JP2016202514A (en) * 2015-04-21 2016-12-08 株式会社東芝 Display device and medical image diagnostic apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001022108A1 (en) * 1999-09-23 2001-03-29 Koninklijke Philips Electronics N.V. Magnetic resonance imaging apparatus including a comfort zone
US6802767B2 (en) 2000-04-10 2004-10-12 Yoshiaki Kanaya Local exhausting and ventilating methods, and local exhausting device and local ventilating system
JP2016202514A (en) * 2015-04-21 2016-12-08 株式会社東芝 Display device and medical image diagnostic apparatus

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