EP1599707A1 - Capteur de puissance ultrasonore - Google Patents

Capteur de puissance ultrasonore

Info

Publication number
EP1599707A1
EP1599707A1 EP04714369A EP04714369A EP1599707A1 EP 1599707 A1 EP1599707 A1 EP 1599707A1 EP 04714369 A EP04714369 A EP 04714369A EP 04714369 A EP04714369 A EP 04714369A EP 1599707 A1 EP1599707 A1 EP 1599707A1
Authority
EP
European Patent Office
Prior art keywords
membrane
power
radiation
transducer
ultrasound
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.)
Withdrawn
Application number
EP04714369A
Other languages
German (de)
English (en)
Inventor
Adam National Physical Laboratory SHAW
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.)
UK Secretary of State for Trade and Industry
Original Assignee
UK Secretary of State for Trade and Industry
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 UK Secretary of State for Trade and Industry filed Critical UK Secretary of State for Trade and Industry
Publication of EP1599707A1 publication Critical patent/EP1599707A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N7/00—Ultrasound therapy
    • A61N7/02—Localised ultrasound hyperthermia
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H3/00—Measuring characteristics of vibrations by using a detector in a fluid
    • G01H3/10—Amplitude; Power
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00017—Electrical control of surgical instruments
    • A61B2017/00022—Sensing or detecting at the treatment site
    • A61B2017/00084—Temperature

Definitions

  • the present invention relates to an ultrasound power sensor, preferably an in-line ultrasound power sensor.
  • the preferred embodiment provides for the determination of the amount of ultrasound power generated by a High Intensity Focused Ultrasound Surgery (HIFUS) system.
  • the preferred embodiment can be used to measure the ultrasound power generated by other medical and non-medical ultrasound systems.
  • HIFUS High Intensity Focused Ultrasound Surgery
  • HIFUS systems are complex (often with integrated imaging systems) and it is extremely difficult to measure the acoustic output without disassembling the system, which the user is not normally able to do. Even when this is possible, the strongly focused, very high intensity, ultrasound fields cannot be measured accurately with conventional ultrasound quality assurance equipment. Instead, the electrical drive to the transducer is monitored in an attempt to detect changes in the expected output level. This method has a large margin for error and is very indirect for such a safety critical application.
  • the present invention seeks to provide improved sensing of radiated power.
  • apparatus for measuring the power emitted during operation by a radiating system including a sensing transducer located in the radiation field to sense power generated during radiation by the system, the transducer being substantially non-absorbing of the radiation beam.
  • the sensing transducer is located substantially in-line with the path of emitted radiation.
  • the transducer includes a membrane substantially transparent to ultrasound located within the emission path of the system.
  • the ultrasound transducer (either permanently or temporarily) in the beam of the ultrasound transducer and provides sensing apparatus operable to determine the amount of heating caused by ultrasonic absorption in the membrane.
  • the amount of heating can be related quantitatively to the ultrasound power. It is preferred that the membrane will be minimally perturbing to the transmitted ultrasound field.
  • the prime task of the preferred embodiment is to ensure that the correct amount of ultrasound power is delivered to a patient during treatment with HIFUS.
  • a surgery system including apparatus as specified herein.
  • a method of measuring the power emitted during operation by a radiating system including providing a sensing transducer located to sense power generated during radiation by the system, the transducer being substantially non-absorbing of the radiation beam.
  • the method may be used to monitor the power from chemical reaction chambers, cleaning baths, material treatment and processing stations, ultrasonic welders, to monitor the power radiated by transducer arrays for underwater acoustics; for medical diagnostic ultrasonic devices including imaging scanners and others; and/or to indicate that an ultrasound device is functioning or to monitor stability or changes in power output.
  • an HIFUS transducer 1 is situated above a tumour 2 in a patient 3 and coupled to the patient by a bag 4 filled with water 5 or any other suitable liquid or fluid.
  • a measure of the power generated by the whole of the radiating beam 10 it is preferred to obtain a measure of the power generated by the whole of the radiating beam 10 and for this purpose there is provided a PVDF membrane or in-line power sensor 6 of thickness approximately 50 ⁇ m mounted on a ring 7 which is inserted between the radiating transducer 1 and the patient 3 and held in position by any suitable mechanism.
  • the ring 7 may be mechanically connected to the membrane 6 and it may be oriented so that it is not perpendicular to the axis of the ultrasound beam.
  • the membrane 6 is poled to be pyroelectrically active and is constructed with electrodes so that any charge generated by the membrane 6 can be measured.
  • the electrodes are connected to an electronic circuit 8 which may be of different specifications as required.
  • the circuit 8 is configured such that the charge generated by the membrane 6 is converted to a voltage which is proportional or nearly proportional to the rate of change of temperature averaged across the part of the membrane which is provided with electrodes. This voltage signal is digitised and presented to the user along with relevant numeric information on display 9.
  • an ultrasound wave 10 is generated which propagates through the membrane 6.
  • a small part of the ultrasound energy is absorbed by the membrane 6, resulting a change in temperature of the membrane which will vary from point to point across the membrane.
  • the charge generated by the change in temperature of the membrane 6 is collected by the electronic circuit 8 via the electrodes as a voltage.
  • the voltage reaches a maximum very soon after the transducer 1 is energised and decays with time until the membrane reaches its equilibrium temperature, when the voltage will be close to zero, which is expected to be after less than one second.
  • the membrane 6 is substantially non-absorbing of the radiating beam. By this it is meant that the membrane 6, or other sensor placed in the beam 10, still allows the beam 10 to perform its intended function, in the example shown in Figure 1 to treat the tumour 2 with substantially the same intensity as without any sensor.
  • the membrane 6 provides a measure of the intensity of the entire beam 10, in effect summing individual areas of the radiation beam 10. In some embodiments, it may be desired to measure only parts of the beam 10, in which case the membrane could take a different form, such as a grid of wires or could instead be one or more sensors occupying a small area of the beam 10. The skilled person will appreciate what sensors would be suitable from the teachings herein.
  • the precise location of the sensor relative to the beam may be changed and the properties of the membrane (material, dimensions, thickness, protective coatings and so on) may be varied to produce the required sensitivity to the propagating ultrasound field.
  • the sensor may be made partially or totally absorbing; the sensor may be used for off-line testing and be removed from the beam during treatment; the sensor may be located away from the usual axis of the beam and a reflector used to direct the beam at the sensor as required; the sensor may intercept only part of the beam thus giving an indication of a more localised power integral; the sensor may placed in contact with the patient; the sensor may be placed on or incorporated into the ultrasound transducer; the sensor may contain layers or coatings for protection or other purposes.
  • the system could potentially be used in any application where there is a technical or economic advantage in being able to measure ultrasound power in the normal operating environment of the ultrasound device.
  • Wider applications may include: the sensor being used to monitor the power from non-medical devices including chemical reaction chambers, cleaning baths, material treatment and processing stations, ultrasonic welders and others; to measure the power radiated by transducer arrays for underwater acoustics; for medical diagnostic ultrasonic devices including imaging scanners and others; and/or simply to indicate that an ultrasound device is functioning or to monitor stability or changes in power output (without necessarily arriving at traceable values for power).
  • the sensor may also be used for any of these primary or secondary applications with non-ultrasound devices that produce a heating effect including lasers and others.
  • the main advantages of the preferred embodiment include: (a) that power can be measured or monitored without dismantling the HIFUS system, thus reducing equipment downtime; (b) that power can be measured immediately before or during every patient treatment, thus ensuring accurate dosimetry; (c) that power can be measured at the output levels used for treatment (whereas a radiation force balance fitted with an absorbing target would probably be damaged by overheating); (d) that power can be measured with equal accuracy irrespective of the amount of focusing applied to the ultrasound beam (whereas a radiation force balance fitted with an conical reflecting target exhibits substantial and increasing systematic errors in more focused fields).

Abstract

L'invention concerne un transducteur HIFUS (1) situé au-dessus d'une tumeur (2) chez un patient (3) et couplé au patient au moyen d'un sachet (4) rempli d'eau (5) ou d'un liquide ou fluide adapté quelconque. Une membrane PVDF ou un capteur de puissance en ligne (6) dont l'épaisseur correspond approximativement à 50 νm monté sur une bague (7) est inséré entre le transducteur et le patient. La membrane (6) présente des pôles de manière à être active pyroélectriquement et à être construite avec des électrodes, de telle sorte qu'une charge quelconque générée par la membrane (6) puisse être mesurée. Lorsque le transducteur HIFUS (1) est excité, une onde ultrasonore (10) est générée et se propage à travers la membrane (6). Une petite partie de l'énergie ultrasonore est absorbée par la membrane (6), ce qui se traduit par la modification de la température qui va varier d'un point à un autre point sur la membrane (6). Ainsi, la puissance peut être mesurée ou surveillée sans démantèlement du système HIFUS, d'où une réduction du temps d'indisponibilité de l'équipement. La puissance peut être mesurée immédiatement avant ou pendant chaque traitement effectué sur un patient, ce qui garantit une dosimétrie précise.
EP04714369A 2003-02-25 2004-02-25 Capteur de puissance ultrasonore Withdrawn EP1599707A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB0304281 2003-02-25
GB0304281A GB0304281D0 (en) 2003-02-25 2003-02-25 Ultrasound power sensor
PCT/GB2004/000736 WO2004076989A1 (fr) 2003-02-25 2004-02-25 Capteur de puissance ultrasonore

Publications (1)

Publication Number Publication Date
EP1599707A1 true EP1599707A1 (fr) 2005-11-30

Family

ID=9953617

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04714369A Withdrawn EP1599707A1 (fr) 2003-02-25 2004-02-25 Capteur de puissance ultrasonore

Country Status (3)

Country Link
EP (1) EP1599707A1 (fr)
GB (1) GB0304281D0 (fr)
WO (1) WO2004076989A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100437053C (zh) * 2005-09-02 2008-11-26 重庆海扶(Hifu)技术有限公司 超声功率测量装置
KR101772480B1 (ko) * 2014-03-26 2017-08-29 알피니언메디칼시스템 주식회사 초음파 장치용 멤브레인 및 그 초음파 장치
CN108180984A (zh) * 2018-01-18 2018-06-19 北京北方高业科技有限公司 一种微热式声音传感器及其制备方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3545381C2 (de) * 1985-12-20 1994-02-24 Siemens Ag Ultraschallwandler zur Messung der Schalleistung eines fokussierten Ultraschallfeldes
CN86207853U (zh) * 1986-10-10 1987-07-29 中国科学院物理研究所 聚偏氟乙烯薄膜激光辐射探测器
US5735280A (en) * 1995-05-02 1998-04-07 Heart Rhythm Technologies, Inc. Ultrasound energy delivery system and method
US5891581A (en) * 1995-09-07 1999-04-06 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Thermally stable, piezoelectric and pyroelectric polymeric substrates
US5860741A (en) * 1996-03-25 1999-01-19 Oriental System Technology, Inc. Absolute radiation thermometer
GB0127529D0 (en) * 2001-11-16 2002-01-09 Secretary Trade Ind Brit Ultrasonic power meter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004076989A1 *

Also Published As

Publication number Publication date
GB0304281D0 (en) 2003-03-26
WO2004076989A1 (fr) 2004-09-10

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