JP2000512005A - 放射器調整 - Google Patents
放射器調整Info
- Publication number
- JP2000512005A JP2000512005A JP09539714A JP53971497A JP2000512005A JP 2000512005 A JP2000512005 A JP 2000512005A JP 09539714 A JP09539714 A JP 09539714A JP 53971497 A JP53971497 A JP 53971497A JP 2000512005 A JP2000512005 A JP 2000512005A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- coil
- probe
- field generator
- sensor
- 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.)
- Granted
Links
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/24—Arrangements or instruments for measuring magnetic variables involving magnetic resonance for measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/246—Spatial mapping of the RF magnetic field B1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/06—Devices, other than using radiation, for detecting or locating foreign bodies ; determining position of probes within or on the body of the patient
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/06—Devices, other than using radiation, for detecting or locating foreign bodies ; determining position of probes within or on the body of the patient
- A61B5/061—Determining position of a probe within the body employing means separate from the probe, e.g. sensing internal probe position employing impedance electrodes on the surface of the body
- A61B5/062—Determining position of a probe within the body employing means separate from the probe, e.g. sensing internal probe position employing impedance electrodes on the surface of the body using magnetic field
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
- G01R33/58—Calibration of imaging systems, e.g. using test probes, Phantoms; Calibration objects or fiducial markers such as active or passive RF coils surrounding an MR active material
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Molecular Biology (AREA)
- Public Health (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Biophysics (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Pathology (AREA)
- Veterinary Medicine (AREA)
- Human Computer Interaction (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Measuring Magnetic Variables (AREA)
- Sampling And Sample Adjustment (AREA)
- Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
Description
Claims (1)
- 【特許請求の範囲】 1.磁場発生装置を調整する方法において、 1個以上の磁場センサーをプローブに既知の位置および方向に固定する工程と 、 前記磁場発生装置の近傍において1個以上の既知の場所を選択する工程と、 前記磁場発生装置を駆動して磁場を発生する工程と、 前記プローブを前記1個以上の場所の各々に向けて所定の既知の方向に移動す る工程と、 前記1個以上の場所の各々における前記1個以上のセンサーから信号を受信す る工程と、 前記信号を処理して前記1個以上のセンサーのそれぞれの位置における磁場の 強度および方向を測定する工程と、 前記磁場発生装置の近傍における磁場の強度および方向に関する調整係数を決 定する工程とから成ることを特徴とする方法。 2.前記1個以上の磁気センサーをプローブに固定する工程がセンサーコイル をプローブに固定する方法から成る請求項1に記載の方法。 3.前記センサーコイルをプローブに固定する工程が2個以上のセンサーコイ ルをそれぞれコイルの軸が相互にほぼ直交するような方向に固定する請求項2に 記載の方法。 4.前記1個以上の磁気センサーをプローブに固定する工程が3個のセンサー を当該センサーのプローブ上における各位置がほぼ同一直線状になるようにプロ ーブに固定する工程から成る請求項3に記載の方法。 5.前記1個以上の磁気センサーをプローブに固定する工程が一定の立方体に センサーを固定する工程から成る請求項3に記載の方法。 6.前記1個以上の既知の場所を選択する工程が複数の場所を選択する工程か ら成り、前記プローブを移動する工程がプローブを前記1個以上のセンサーによ り定められる軸に沿って移動して前記複数の場所の2個以上を通過させる工程か ら成る請求項3乃至請求項5のいずれか1項に記載の方法。 7.前記プローブを軸に沿って移動する工程がプローブをほぼ等しい長さで段 階的に移動する工程から成り、前記センサーの任意の2個の間の距離が当該各段 階の長さによって概ね整数分割できる請求項6に記載の方法。 8.前記請求項のいずれかに記載の方法であって、 前記磁場発生装置を調整する工程が概ね回転方向に対称の磁場発生装置を調整 する工程から成り、 前記1個以上の既知の場所を選択する工程が前記磁場発生装置の回転対称軸と 当該磁場発生装置により定められ前記回転対称軸に垂直な平面における第2の軸 とによって定められる四分割面内における1個以上の場所を選択する工程から成 り、 前記プローブを移動する工程が前記1個以上のセンサーが前記四分割面内に位 置するようにプローブを方向付ける工程から成ることを特徴とする方法。 9.前記請求項のいずれかに記載の方法であって、前記調整係数を決定する工 程が、 前記1個以上の既知の場所において前記磁場発生装置により発生される磁場の 強度および方向の理論値を計算する工程と、 前記理論値を前記場所において測定した磁場の強度および方向と比較する工程 と、 前記理論値と前記各場所において測定した磁場の強度および方向との間の差に 基づいて演算係数を計算する工程とから成ることを特徴とする方法。 10.前記演算係数を計算する工程が前記理論値を前記測定した場の強度およ び方向に適合する工程から成る請求項9に記載の方法。 11.前記理論値を計算する工程が、 前記磁場発生装置内に空気コアが存在する場合の磁場の理論的モデルを導き出 す工程と、 前記磁場発生装置内に強磁性体コアが存在する場合に対応して前記モデルを変 形する工程とから成る請求項9または請求項10に記載の方法。 12.前記モデルを変形する工程が前記コアによる場の変動を決定する工程か ら成る請求項11に記載の方法。 13.前記場の変動を決定する工程が前記コアの非線形性による変動を決定す る工程から成る請求項12に記載の方法。 14.前記場の変動を決定する工程が前記コア内の渦電流による変動を決定す る工程から成る請求項12または請求項13に記載の方法。 15.前記請求項のいずれかに記載の方法であって、 磁場応答性位置感知装置を目的物に固定する工程と、 前記目的物を前記磁場発生装置の近傍に配置する工程と、 前記位置感知装置から信号を受信する工程と、 前記信号を処理して前記目的物の位置または方向を計算する工程と、 前記調整係数を用いて前記位置または方向の計算精度を高める工程とから成る ことを特徴とする方法。 16.前記請求項のいずれかに記載の方法であって、前記調整係数を前記放射 器コイルに付属するメモリー内に記憶させる工程から成ることを特徴とする方法 。 17.磁場発生装置を調整するための装置において、 前記磁場発生装置によって発生される磁場に応じて電気的信号を発生する複数 の磁場センサー、 前記センサーを移動するための位置決め装置とから成り、 前記位置決め装置が前記複数のセンサーの2個以上により定められる軸に平行 な移動軸を有することを特徴とする装置。 18.前記磁場センサーがセンサーコイルから成り、当該コイルのそれぞれの 軸が相互にほぼ直交するように固定される請求項17に記載の装置。 19.前記センサーが前記位置決め装置にほぼ直線配列で固定されている請求 項17または請求項18に記載の装置。 20.前記センサーが立方体の各面に固定され、当該立方体が前記位置決め装 置に固定されている請求項17または請求項18に記載の装置。 21.さらに、前記センサーから信号を受け取って当該信号を理論的モデルと 比較することにより前記磁場発生装置を調整するコンピュータから成る請求項1 7乃至請求項20のいずれか1項に記載の方法。 22.磁場を発生するように駆動される少なくとも1個のコイルと、 前記少なくとも1個のコイルに付属して当該コイルにより発生される場に関す る調整係数を記憶する電子メモリー回路とから成る調整された磁場発生装置。 23.前記少なくとも1個のコイルの内側にコアを備える請求項22に記載の 磁場発生装置。 24.前記コアが強磁性体により構成されている請求項23に記載の磁場発生 装置。 25.前記強磁性体がフェライトである請求項24に記載の磁場発生装置。 26.前記強磁性体が軟鉄である請求項24に記載の磁場発生装置。 27.前記電子メモリー回路がEPROMから構成されている請求項22乃至 請求項26のいずれかに記載の磁場発生装置。 28.前記調整係数が前記少なくとも1個のコイルにより発生される場をその 理論的モデルに関係付ける請求項22乃至請求項27のいずれか1項に記載の磁 場発生装置。 29.前記調整係数がルックアップテーブルにより構成されている請求項28 に記載の磁場発生装置。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US1690896P | 1996-05-06 | 1996-05-06 | |
US60/016,908 | 1996-05-06 | ||
PCT/IL1997/000146 WO1997042517A1 (en) | 1996-05-06 | 1997-05-05 | Radiator calibration |
Publications (3)
Publication Number | Publication Date |
---|---|
JP2000512005A true JP2000512005A (ja) | 2000-09-12 |
JP2000512005A5 JP2000512005A5 (ja) | 2005-01-13 |
JP4183753B2 JP4183753B2 (ja) | 2008-11-19 |
Family
ID=21779667
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP53971497A Expired - Lifetime JP4183753B2 (ja) | 1996-05-06 | 1997-05-05 | 放射器の較正 |
Country Status (9)
Country | Link |
---|---|
US (1) | US6335617B1 (ja) |
EP (1) | EP0901638B1 (ja) |
JP (1) | JP4183753B2 (ja) |
AU (1) | AU722748B2 (ja) |
CA (1) | CA2253634C (ja) |
DE (1) | DE69737287T2 (ja) |
ES (1) | ES2279540T3 (ja) |
IL (1) | IL126864A (ja) |
WO (1) | WO1997042517A1 (ja) |
Cited By (5)
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JP2002122409A (ja) * | 2000-07-20 | 2002-04-26 | Biosense Inc | 電磁的位置1軸システム |
JP2014021111A (ja) * | 2012-07-12 | 2014-02-03 | Biosense Webster (Israel) Ltd | 単軸センサのための位置及び向きアルゴリズム |
JP2017538491A (ja) * | 2014-12-11 | 2017-12-28 | コーニンクレッカ フィリップス エヌ ヴェKoninklijke Philips N.V. | 追跡型インターベンショナルプロシージャにおける最適なキャリブレーションの自動選択 |
JP2020503082A (ja) * | 2016-10-28 | 2020-01-30 | コヴィディエン リミテッド パートナーシップ | マップに基づいて電磁センサの位置及び/又は配向を特定するためのシステム及び方法 |
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Cited By (6)
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JP2002122409A (ja) * | 2000-07-20 | 2002-04-26 | Biosense Inc | 電磁的位置1軸システム |
JP2014021111A (ja) * | 2012-07-12 | 2014-02-03 | Biosense Webster (Israel) Ltd | 単軸センサのための位置及び向きアルゴリズム |
JP2017538491A (ja) * | 2014-12-11 | 2017-12-28 | コーニンクレッカ フィリップス エヌ ヴェKoninklijke Philips N.V. | 追跡型インターベンショナルプロシージャにおける最適なキャリブレーションの自動選択 |
JP2020503082A (ja) * | 2016-10-28 | 2020-01-30 | コヴィディエン リミテッド パートナーシップ | マップに基づいて電磁センサの位置及び/又は配向を特定するためのシステム及び方法 |
JP7035043B2 (ja) | 2016-10-28 | 2022-03-14 | コヴィディエン リミテッド パートナーシップ | マップに基づいて電磁センサの位置及び/又は配向を特定するためのシステム及び方法 |
US11759264B2 (en) | 2016-10-28 | 2023-09-19 | Covidien Lp | System and method for identifying a location and/or an orientation of an electromagnetic sensor based on a map |
Also Published As
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JP4183753B2 (ja) | 2008-11-19 |
AU2648797A (en) | 1997-11-26 |
EP0901638A4 (en) | 2001-04-18 |
WO1997042517A1 (en) | 1997-11-13 |
AU722748B2 (en) | 2000-08-10 |
CA2253634C (en) | 2004-11-30 |
EP0901638B1 (en) | 2007-01-24 |
IL126864A (en) | 2003-05-29 |
CA2253634A1 (en) | 1997-11-13 |
DE69737287D1 (de) | 2007-03-15 |
EP0901638A1 (en) | 1999-03-17 |
ES2279540T3 (es) | 2007-08-16 |
DE69737287T2 (de) | 2007-11-15 |
IL126864A0 (en) | 1999-09-22 |
US6335617B1 (en) | 2002-01-01 |
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