WO2004091391A1 - Method for detection and compensation of eddy currents - Google Patents
Method for detection and compensation of eddy currents Download PDFInfo
- Publication number
- WO2004091391A1 WO2004091391A1 PCT/CA2004/000587 CA2004000587W WO2004091391A1 WO 2004091391 A1 WO2004091391 A1 WO 2004091391A1 CA 2004000587 W CA2004000587 W CA 2004000587W WO 2004091391 A1 WO2004091391 A1 WO 2004091391A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- position indication
- frequency
- undisturbed
- phase
- amplitude
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B34/00—Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
- A61B34/20—Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
-
- 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
- G01R33/20—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
- G01R33/54—Signal processing systems, e.g. using pulse sequences ; Generation or control of pulse sequences; Operator console
- G01R33/56—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution
- G01R33/565—Correction of image distortions, e.g. due to magnetic field inhomogeneities
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B34/00—Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
- A61B34/20—Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
- A61B2034/2046—Tracking techniques
- A61B2034/2051—Electromagnetic tracking systems
-
- 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
Definitions
- the first frequency can be a superior harmonic of the second position indication signal and the second frequency can be a subordinate harmonic of the first position indication signal.
- the superior harmonic can be the fundamental frequency and the subordinate harmonic can be the third harmonic.
- the first frequency is less than the second frequency.
- the first frequency and the second frequency can be harmonically related. Multiple frequencies can be generated by a chirped waveform, for example.
- Other aspects of the invention can include receiving from a sensor the real and imaginary components of the first and second position indication signals.
- FIG. 2 is a phasor diagram including an undisturbed phasor, a disturbed phasor, and an eddy current phasor.
- FIG. 3 is a flow chart of a signal compensation process .
- FIG. 11 is a flow chart of a signal compensation process .
- the ratio relating the eddy current phases of two signals can be further generalized to any pair of harmonic or non-harmonic frequencies .
- This continuous form of K can be normalized to a particular frequency ⁇ n and written as follows :
- ⁇ ( ⁇ ) The value of ⁇ ( ⁇ ) is used when solving a set of equations for two disturbed phasors.
- the compensation procedure uses the phasors for the first and third harmonic.
- the theory applies to any pair or set of frequencies.
- the real and imaginary components of the fundamental frequency (first harmonic) are as follows:
- FIGS. 8 and 9 show graphical representations of exemplary results from the eddy current compensation procedure. The results shown in these figures are for a field generator coil driven with a waveform having a fundamental frequency of about 3 kHz and a third harmonic of about 9 kHz . Higher order harmonics were present but were not used in the compensation scheme.
- the j' th frequency is used as a "normalization" frequency (labeled as 1 in equation (13) for example) .
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT04728145T ATE536802T1 (en) | 2003-04-17 | 2004-04-19 | METHOD FOR DETECTING AND COMPENSATING EDDY CURRENTS |
JP2006504114A JP2006523473A (en) | 2003-04-17 | 2004-04-19 | Method for detection and correction of eddy currents |
EP04728145A EP1613213B1 (en) | 2003-04-17 | 2004-04-19 | Method for detection and compensation of eddy currents |
CA2521537A CA2521537C (en) | 2003-04-17 | 2004-04-19 | Method for detection and compensation of eddy currents |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US46357603P | 2003-04-17 | 2003-04-17 | |
US60/463,576 | 2003-04-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004091391A1 true WO2004091391A1 (en) | 2004-10-28 |
Family
ID=33300081
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CA2004/000587 WO2004091391A1 (en) | 2003-04-17 | 2004-04-19 | Method for detection and compensation of eddy currents |
Country Status (8)
Country | Link |
---|---|
US (4) | US7783441B2 (en) |
EP (3) | EP2052681B1 (en) |
JP (1) | JP2006523473A (en) |
KR (1) | KR20060023960A (en) |
CN (3) | CN100534387C (en) |
AT (1) | ATE536802T1 (en) |
CA (2) | CA2521537C (en) |
WO (1) | WO2004091391A1 (en) |
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US8994376B2 (en) | 2009-05-26 | 2015-03-31 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Detection method and detector of a disruption, positioning method and system using said method |
US10285760B2 (en) | 2015-02-04 | 2019-05-14 | Queen's University At Kingston | Methods and apparatus for improved electromagnetic tracking and localization |
US10722140B2 (en) | 2014-07-03 | 2020-07-28 | St. Jude Medical International Holding S.À R.L. | Localized magnetic field generator |
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- 2004-04-15 US US10/824,846 patent/US7783441B2/en active Active
- 2004-04-19 JP JP2006504114A patent/JP2006523473A/en active Pending
- 2004-04-19 EP EP09153061.8A patent/EP2052681B1/en active Active
- 2004-04-19 CN CNB2004800098305A patent/CN100534387C/en active Active
- 2004-04-19 CA CA2521537A patent/CA2521537C/en active Active
- 2004-04-19 WO PCT/CA2004/000587 patent/WO2004091391A1/en active Application Filing
- 2004-04-19 CN CN2009100064411A patent/CN101498687B/en active Active
- 2004-04-19 EP EP04728145A patent/EP1613213B1/en active Active
- 2004-04-19 EP EP10184092.4A patent/EP2269507B1/en active Active
- 2004-04-19 CA CA2756830A patent/CA2756830C/en active Active
- 2004-04-19 KR KR1020057019776A patent/KR20060023960A/en not_active Application Discontinuation
- 2004-04-19 AT AT04728145T patent/ATE536802T1/en active
- 2004-04-19 CN CN2009100064407A patent/CN101496724B/en active Active
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Cited By (17)
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JP2008541795A (en) * | 2005-05-05 | 2008-11-27 | ストライカー・コーポレイション | System and method for electromagnetic navigation in the vicinity of metal objects |
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EP1887309A1 (en) * | 2006-08-07 | 2008-02-13 | Biosense Webster, Inc. | Distortion-immune position tracking using redundant measurements |
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DE102007012361A1 (en) * | 2007-03-14 | 2008-09-25 | Siemens Ag | Method for determining the position of a medical instrument |
US8994376B2 (en) | 2009-05-26 | 2015-03-31 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Detection method and detector of a disruption, positioning method and system using said method |
US10722140B2 (en) | 2014-07-03 | 2020-07-28 | St. Jude Medical International Holding S.À R.L. | Localized magnetic field generator |
US11771338B2 (en) | 2014-07-03 | 2023-10-03 | St Jude Medical International Holding S.À R.L. | Localized magnetic field generator |
US10285760B2 (en) | 2015-02-04 | 2019-05-14 | Queen's University At Kingston | Methods and apparatus for improved electromagnetic tracking and localization |
US10925469B2 (en) | 2016-03-04 | 2021-02-23 | Olympus Corporation | Guidance apparatus and capsule medical apparatus guidance system |
EP3811890A1 (en) * | 2016-11-21 | 2021-04-28 | St. Jude Medical International Holding S.à r.l. | Fluorolucent magnetic field generator |
US11617511B2 (en) | 2016-11-21 | 2023-04-04 | St Jude Medical International Holdings Sarl | Fluorolucent magnetic field generator |
US11826123B2 (en) | 2016-11-21 | 2023-11-28 | St Jude Medical International Holding S.À R.L. | Fluorolucent magnetic field generator |
Also Published As
Publication number | Publication date |
---|---|
CN101498687A (en) | 2009-08-05 |
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CN1774202A (en) | 2006-05-17 |
US7957925B2 (en) | 2011-06-07 |
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CN100534387C (en) | 2009-09-02 |
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