JP4031964B2 - Receiver coil for magnetic resonance imaging apparatus and apparatus using the same - Google Patents
Receiver coil for magnetic resonance imaging apparatus and apparatus using the same Download PDFInfo
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- JP4031964B2 JP4031964B2 JP2002262347A JP2002262347A JP4031964B2 JP 4031964 B2 JP4031964 B2 JP 4031964B2 JP 2002262347 A JP2002262347 A JP 2002262347A JP 2002262347 A JP2002262347 A JP 2002262347A JP 4031964 B2 JP4031964 B2 JP 4031964B2
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- receiving coil
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- 238000002595 magnetic resonance imaging Methods 0.000 title claims description 24
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 238000002834 transmittance Methods 0.000 claims description 6
- 238000003384 imaging method Methods 0.000 description 10
- 238000001356 surgical procedure Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000003068 static effect Effects 0.000 description 5
- 238000005481 NMR spectroscopy Methods 0.000 description 3
- 210000004556 brain Anatomy 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
- 206010028980 Neoplasm Diseases 0.000 description 1
- 210000001015 abdomen Anatomy 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000004872 soft tissue Anatomy 0.000 description 1
- 210000001835 viscera Anatomy 0.000 description 1
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- Apparatus For Radiation Diagnosis (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、磁気共鳴イメージング装置（以下、MRI装置という）用の受信コイルに係り、特に撮影を行ないながら手術や治療を行うInterventional MRI（以下、I-MRという）において、手術中にMRI撮影を行うとともに、X線撮影も行うことに好適なMRI装置用受信コイルに関する。
【０００２】
【従来の技術】
MRI装置は、静磁場中に置かれた被検体に対し高周波パルスを照射することで、被検体中の原子核の核スピンが励起され核磁気共鳴信号を発生させる。このとき、傾斜磁場を所定のシーケンスで印加することにより、核磁気共鳴信号に位置的な情報が与えられ、この核磁気共鳴信号を画像再構成することにより被検体内の断層像を得ることができる。MRI装置では、X線等による被曝がなく、また傾斜磁場の印加の仕方により任意の断面像を得ることができ、さらには内臓や脳等の軟部組織の分解能に優れているため、現在様々な用途に用いられている。
【０００３】
また最近では、静磁場を発生するための磁石（超電導磁石、永久磁石等）を上下に配置したオープン型のMRI装置を手術室内に置いて、被検体を配置した空間の側方から手術や治療等を行なうI-MRが行われている。
【０００４】
I-MRにおいて例えば頭部の手術を行なう場合に、脳定位固定具によって頭部（脳）を固定し、内視鏡や顕微鏡を使用して腫瘍の摘出手術等が行われる。この時、脳定位固定具を受信コイルの一部としても兼ねる例がある(非特許文献1)。
【０００５】
【非特許文献１】
Hiroki Taniguchi, et al “Development of Hitchcock stereotactic frame for intraoperative open MRI” Computed Assisted Radiology and Surgery, Proceedings of the 16th International Congress and Exhibition, 予稿集P144-149。
上記文献では、受信コイルを上部と下部の2つに分け、下部を脳定位固定具としても用い、材質をアルミニウムとしていた。
【０００６】
【発明が解決しようとする課題】
しかし、手術をしながらMRI診断をするとともに、同一室内でX線診断をする手法が臨床上有用になっている。その際アルミニウム材質の下部の受信コイルによって、被検体の頭部を固定したままで寝台をX線診断装置へ移動させ頭部X線撮影を行うと、アルミニウムのX線透過率が低いため、アルミニウムのコイル部材がX線画像の障害となるという問題を有していた。
【０００７】
本発明の目的は、受信コイルの一部である脳定位固定具で被検体の頭部を固定したままで、手術やMRI撮影を行うとともにX線撮影も行うことのできるMRI装置用受信コイルを提供することにある。
【０００８】
【課題を解決するための手段】
上記目的を達成するために、寝台に横たわされた被検体を、半円状で下側から囲うように固定する、寝台に設置された下部受信コイル部と、上記半円状の下部受信コイル部と共に上記被検体を囲むループを形成させる上部受信コイル部と、上記下部受信コイル部と上部受信コイル部を接続する中継コネクタとから成る磁気共鳴イメージング装置用受信コイルにおいて、上記下部受信コイル部は非磁性かつ導電性を有し、アルミニウムよりＸ線透過率の高い部材から構成されているものとする。好ましくは、上記固定具はカーボンを含んで構成されているものとする。
【０００９】
【発明の実施の形態】
本発明の実施形態を図を用いて説明する。
【００１０】
本発明の実施形態において適用されるMRI装置の構成を図1に示す。1は静磁場発生用磁石であり、被検体5の周囲に静磁場を発生する。オープンMRI装置の場合、被検体の体軸に対して垂直方向に静磁場を発生させる方式となっている。2は上記被検体5の周囲に傾斜磁場を発生する傾斜磁場コイル、3は上記被検体5の周囲に高周波磁場を発生するRF照射コイル、4aは上部受信コイル、4bは脳定位固定具も兼ねる下部受信コイル、5は被検体、6は寝台である。
【００１１】
図1における上部受信コイル4aと下部受信コイル4bを拡大した図を、図2（a）及び図2（b）に示す。ただし、図2（a）に被検体及び受信コイルを被検体の側面方向から見た図、図2(b)に被検体及び受信コイルを被検体の頭頂方向から見た図を示す。4cは中継コネクタ、7は被検体の頭部である。下部受信コイル4ｂは、寝台6にはめ込むことにより固定する。上部受信コイル4aは、中継コネクタ4cを介して下部受信コイル4bに接続する。
【００１２】
本発明の実施形態において適用される受信コイルは、上部受信コイル4aは従来の技術で示したHitchcock frameの場合と同様にアルミニウムで構成されている。一方下部受信コイル4bは、X線透過率の高い材質であるカーボンでできている。
【００１３】
次に本発明の実施形態において適用されるX線診断装置の構成を図3に示す。15は2次元X線検出器、16はX線管、17はCアームである。本装置を用いX線撮影を行う際 には、上部受信コイル4aは取りはずされ、下部受信コイル4bのみで被検体の頭部7を固定する。これを拡大して示すと、図4のようになる。ただし、図4（a）に被検体及び 受信コイルを被検体の側面方向から見た図、図4(b)に被検体及び受信コイルを被検体の頭頂方向から見た図を示す。
【００１４】
本発明の実施形態において適用される下部受信コイル4bは、X線透過率の高い材質であるカーボンでできているため、下部受信コイル4bを用い被検体の頭部７を固定しX線撮影する場合、アルミニウムを用いていた時のようにX線画像上に下部受信コイルの影が発生せず、臨床上支障のないX線画像が得られる。
【００１５】
以上のように、本実施形態では脳定位固定具も兼ねる下部受信コイル4bがカーボンより構成されているため、被検体の頭部を下部受信コイル4bで寝台6に固定した状態で手術、MRI撮影及びX線撮影ができる。
【００１６】
本発明は上記実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲で種種に変形して実施できるものである。例えば、上記実施形態ではベース部11の材質としてカーボンを採用したが、非磁性かつ良導電性でX線透過率の高い材質であれば、他の材質でも良い。また、本発明での下部受信コイルは頭部を固定するために用いるのに限定されない。例えば、腹部を固定するために用いることも可能である。
【００１７】
【発明の効果】
以上説明した如く、本発明による磁気共鳴イメージング装置用受信コイルによれば、被検体の頭部を脳定位固定具も兼ねる下部の受信コイルで固定した状態で、手術やMRI撮影、線撮影を行うことのできる。
【図面の簡単な説明】
【図１】本発明において適用されるMRI装置の構成図。
【図２】本発明における受信コイルの説明図（上部受信コイルを接続する場合の図）。
【図３】本発明において適用されるX線診断装置の構成図。
【図４】本発明における受信コイルの説明図（上部受信コイルを取り外した場合の図）。
【符号の説明】
４ａ…上部受信コイル
４ｂ…下部受信コイル
４ｃ…中継コネクタ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a receiving coil for a magnetic resonance imaging apparatus (hereinafter referred to as an MRI apparatus). In particular, in an interventional MRI (hereinafter referred to as I-MR) that performs surgery or treatment while performing imaging, MRI imaging is performed during surgery. It is related with the receiving coil for MRI apparatuses suitable for also performing X-ray imaging.
[0002]
[Prior art]
The MRI apparatus irradiates a subject placed in a static magnetic field with a high frequency pulse, thereby exciting nuclear spins of nuclei in the subject to generate a nuclear magnetic resonance signal. At this time, positional information is given to the nuclear magnetic resonance signal by applying a gradient magnetic field in a predetermined sequence, and a tomographic image in the subject can be obtained by image reconstruction of the nuclear magnetic resonance signal. it can. MRI equipment is not exposed to X-rays, can obtain arbitrary cross-sectional images by applying gradient magnetic fields, and has excellent resolution of soft tissues such as internal organs and brain. Used for applications.
[0003]
Recently, an open-type MRI system with magnets for generating a static magnetic field (superconducting magnets, permanent magnets, etc.) placed vertically is placed in the operating room, and surgery and treatment are performed from the side of the space where the subject is placed. Etc. I-MR is performed.
[0004]
For example, when performing head surgery in I-MR, the head (brain) is fixed with a stereotaxic instrument, and an operation such as removal of a tumor is performed using an endoscope or a microscope. At this time, there is an example in which the stereotaxic instrument also serves as a part of the receiving coil (Non-patent Document 1).
[0005]
[Non-Patent Document 1]
Hiroki Taniguchi, et al "Development of Hitchcock stereotactic frame for intraoperative open MRI" Computed Assisted Radiology and Surgery, Proceedings of the 16 th International Congress and Exhibition, Proceedings P144-149.
In the above document, the receiving coil is divided into an upper part and a lower part, the lower part is also used as a stereotaxic instrument, and the material is aluminum.
[0006]
[Problems to be solved by the invention]
However, the technique of performing MRI diagnosis while performing surgery and X-ray diagnosis in the same room has become clinically useful. At that time, if the X-ray imaging of the head is performed by moving the bed to the X-ray diagnostic apparatus while the head of the subject is fixed with the receiving coil under the aluminum material, the X-ray transmittance of aluminum is low. The coil member has a problem that the X-ray image becomes an obstacle.
[0007]
An object of the present invention is to provide a receiving coil for an MRI apparatus capable of performing X-ray imaging as well as performing surgery and MRI imaging while fixing the subject's head with a stereotaxic fixture that is a part of the receiving coil. It is to provide.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the subject is Yokotawa the bed, fixed so as to surround the lower side in semicircular, and the lower receiving coil section installed in the bed, the semicircular lower receiving A receiving coil for a magnetic resonance imaging apparatus, comprising: an upper receiving coil unit that forms a loop surrounding the subject together with the coil unit; and a relay connector that connects the lower receiving coil unit and the upper receiving coil unit. has a non-magnetic and electrically conductive, and that is composed of a high X-ray transmittance from aluminum member. Preferably, the fixture includes carbon.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0010]
The configuration of the MRI apparatus applied in the embodiment of the present invention is shown in FIG. Reference numeral 1 denotes a static magnetic field generating magnet that generates a static magnetic field around the
[0011]
An enlarged view of the
[0012]
In the receiving coil applied in the embodiment of the present invention, the upper receiving
[0013]
Next, FIG. 3 shows the configuration of the X-ray diagnostic apparatus applied in the embodiment of the present invention. 15 is a two-dimensional X-ray detector, 16 is an X-ray tube, and 17 is a C-arm. When performing X-ray imaging using this apparatus, the
[0014]
Since the
[0015]
As described above, in this embodiment, the
[0016]
The present invention is not limited to the above-described embodiment, and can be implemented with various modifications without departing from the gist of the present invention. For example, in the above embodiment, carbon is used as the material of the base portion 11, but other materials may be used as long as they are nonmagnetic, highly conductive, and have a high X-ray transmittance. Further, the lower receiving coil in the present invention is not limited to use for fixing the head. For example, it can be used to fix the abdomen.
[0017]
【The invention's effect】
As described above, according to the receiving coil for a magnetic resonance imaging apparatus according to the present invention, surgery, MRI imaging, and line imaging are performed with the subject's head fixed by the lower receiving coil that also serves as a stereotaxic fixture. I can do it.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an MRI apparatus applied in the present invention.
FIG. 2 is an explanatory diagram of a receiving coil in the present invention (a diagram when an upper receiving coil is connected).
FIG. 3 is a configuration diagram of an X-ray diagnostic apparatus applied in the present invention.
FIG. 4 is an explanatory diagram of a receiving coil according to the present invention (a diagram when an upper receiving coil is removed).
[Explanation of symbols]
4a ... Upper receiving
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002262347A JP4031964B2 (en) | 2002-09-09 | 2002-09-09 | Receiver coil for magnetic resonance imaging apparatus and apparatus using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002262347A JP4031964B2 (en) | 2002-09-09 | 2002-09-09 | Receiver coil for magnetic resonance imaging apparatus and apparatus using the same |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2004097431A JP2004097431A (en) | 2004-04-02 |
| JP2004097431A5 JP2004097431A5 (en) | 2005-10-27 |
| JP4031964B2 true JP4031964B2 (en) | 2008-01-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| JP2002262347A Expired - Fee Related JP4031964B2 (en) | 2002-09-09 | 2002-09-09 | Receiver coil for magnetic resonance imaging apparatus and apparatus using the same |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0512078D0 (en) * | 2005-06-14 | 2005-07-20 | Gill Steven S | RF Coil structure |
| WO2011000085A1 (en) * | 2009-07-03 | 2011-01-06 | Imris Inc. | Rf coil for mr imaging which is not visible in x-ray image |
| US9081067B2 (en) * | 2011-05-09 | 2015-07-14 | Imris Inc. | Phased array MR RF coil which is not visible in X-ray image |
| JP2019524301A (en) * | 2016-08-08 | 2019-09-05 | コーニンクレッカ フィリップス エヌ ヴェＫｏｎｉｎｋｌｉｊｋｅ Ｐｈｉｌｉｐｓ Ｎ．Ｖ． | Mock-up antenna and coil system |
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2002
- 2002-09-09 JP JP2002262347A patent/JP4031964B2/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| JP2004097431A (en) | 2004-04-02 |
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