Patents by Inventor Bjorn A. J. Angelsen

Bjorn A. J. Angelsen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20130096595
    Abstract: A system and methods are provided and thrombi treatments in which hyperthermia is induced in an initial phase and cavitation and/or drug release are induced in a subsequent phase in a region of interest in a human or animal body. The system includes an energy transmitter having a variable intensity and/or a variable frequency; and a control unit arranged to control the energy transmitter to operate in at least two different modes. In one embodiment, the first mode is a mode of operation having a mechanical index below a threshold level for cavitation; and the second mode is a mode of operation having a mechanical index above a threshold level for cavitation. In another embodiment, the first mode induces hyperthermia below a temperature threshold for releasing an encapsulated agent and the second mode induces hyperthermia above the temperature threshold. The initial hyperthermia treatment enhances the effect of subsequent treatments.
    Type: Application
    Filed: April 14, 2011
    Publication date: April 18, 2013
    Inventors: Gunnar Myhr, Bjorn A.J. Angelsen
  • Publication number: 20120287757
    Abstract: Methods and instrumentation for detecting and representing at least one geologic formation in front of an operating drill-bit using the vibration noise generated by the operating drill-bit as a source, comprising at least one receive array comprising more than one receive vibration sensor elements, said at least one receive array are located in one or both of i) at least one receive well, and ii) submerged in water for sub-sea operation, and beam forming at least one receive signal from the signals from said more than one receive elements of said at least one receive array, and forming at least one reference signal representing the vibrations of the operating drill-bit, and correlating said at least one receive signal with said at least one reference signal with different correlation lags, and forming a seismic representation of the at least one geologic formation in front of the drill-bit through said correlating.
    Type: Application
    Filed: May 9, 2012
    Publication date: November 15, 2012
    Applicant: SURF Technology AS
    Inventors: Bjørn A. J. ANGELSEN, Erling FJÆR, Ketil Bø
  • Patent number: 8182428
    Abstract: An acoustic probe transmits/receives acoustic pulses with frequencies both in a high frequency (HF), and a selectable amount of lower frequency (LF1, LF2, . . . , LFn, . . . ) bands. The radiation surfaces of at least two of the multiple frequency bands have a common region. The arrays and elements can be of a general type such as annular arrays, phased or switched arrays, linear arrays with division in both azimuth and elevation direction, like a 1.5D, a 1.75D and a full 2D array, or curved arrays. The element division, array type, and array aperture sizes for the different bands can also be different.
    Type: Grant
    Filed: January 9, 2009
    Date of Patent: May 22, 2012
    Assignee: SURF Technology AS
    Inventors: Bjørn A. J. Angelsen, Tonni F. Johansen, Rune Hansen, Sven Peter Nasholm, Svein-Erik Måsøy
  • Publication number: 20120095699
    Abstract: 1st and 2nd pulsed waves are transmitted along 1st and 2nd transmit beams where at least one of the beams is broad in at least one direction, and the transmit timing between said 1st and 2nd pulsed waves are selected so that the pulsed wave fronts overlap in an overlap region R(r,t) that propagates along at least one measurement or image curve ?(r) in the material object. At least the scattered signal produced by nonlinear interaction between said 1st and 2nd waves in the overlap region is received and processed to form a nonlinear interaction scattering image signal along ?(r). The measurement or image curve ?(r) can be scanned laterally by either changing of the relative transmit timing between the 1st and 2nd pulsed waves or the direction of at least one of the 1st and 2nd transmit beams, or both. The methods are applicable to image nonlinear scattering sources for both electromagnetic and elastic waves, and combinations of these.
    Type: Application
    Filed: August 19, 2011
    Publication date: April 19, 2012
    Applicant: SURF Technology AS
    Inventors: Bjørn A. J. Angelsen, Rune Hansen, Thor Andreas Tangen
  • Patent number: 8157739
    Abstract: A method and an instrument for ultrasound imaging using an array of transducer elements which is connected to the instrument with a limited number of wires, where focusing of the transmit beam improves image signal to noise ratio above state of the art methods. This allows the use of higher ultrasound frequencies providing improved image resolution.
    Type: Grant
    Filed: September 2, 2004
    Date of Patent: April 17, 2012
    Assignee: SURF Technology AS
    Inventors: Bjørn A. J. Angelsen, Tonni F. Johansen
  • Patent number: 8063540
    Abstract: A design and a manufacturing method of ultrasound transducers based on films of ferro-electric ceramic material is presented, the transducers being particularly useful for operating at frequencies above 10 MHz. The manufacturing technique can involve tape-casting of the ceramic films, deposition of the ceramic films onto a substrate with thick film printing, sol-gel, or other deposition techniques, where manufacturing methods for load matching layers and composite ceramic layers are described. The designs also involve acoustic load matching layers that provide particularly wide bandwidth of the transducers, and also multi-band operation of the transducers. The basic designs can be used for elements in a transducer array, that provides the frequency characteristics of the single element transducers, for array steering of the focus and possibly also direction of a pulsed ultrasound beam at high frequencies and multi-band frequencies.
    Type: Grant
    Filed: March 8, 2005
    Date of Patent: November 22, 2011
    Assignee: Emantec AS
    Inventors: Bjørn A. J. Angelsen, Tonni F. Johansen, Helge Kristiansen
  • Patent number: 8038616
    Abstract: Methods of acoustic imaging provide images with reduced reverberation noise and images of nonlinear scattering and propagation parameters of the object, and estimation methods of corrections for wave front aberrations produced by spatial variations in the acoustic propagation velocity. The methods are based on processing of the received signal from transmitted dual frequency band acoustic pulse complexes with overlapping high and low frequency pulses. The high frequency pulse is used for the image reconstruction and the low frequency pulse is used to manipulate the nonlinear scattering and/or propagation properties of the high frequency pulse. Through filtering in the pulse number coordinate and corrections for nonlinear propagation delays and optionally also amplitudes, a linear back scattering signal with suppressed pulse reverberation noise, a nonlinear back scattering signal, and quantitative nonlinear forward propagation and scattering parameters are extracted.
    Type: Grant
    Filed: August 16, 2005
    Date of Patent: October 18, 2011
    Assignee: SURF Technology AS
    Inventors: Bjørn A. J. Angelsen, Rune Hansen, Øyvind Krovel-Velle Standal
  • Patent number: 7758509
    Abstract: A method of real time ultrasound imaging of an object in at least three two-dimensional scan planes that are rotated around a common axis, is given, together with designs of ultrasound transducer arrays that allows for such imaging. The method is also introduced into a monitoring situation of cardiac function where, combined with other measurements as for example the LV pressure, physiological parameters like ejection fraction and muscular fiber stress is calculated.
    Type: Grant
    Filed: March 13, 2003
    Date of Patent: July 20, 2010
    Inventors: Bjørn A. J. Angelsen, Tonni F. Johansen
  • Patent number: 7727156
    Abstract: Ultrasound probes that transmits/receives ultrasound pulses with frequencies both in a low frequency (LF) and a high frequency (HF) band, where the radiation surfaces of said HF and LF bands at least have a common region. Several solutions for transmission (and reception) of LF and HF pulses through the same radiation surface are given. The arrays and elements can be of a general type, for example linear phased or switched arrays, or annular arrays or elements with division in both azimuth and elevation direction, like a 1.5D, a 1.75D and a full 2D array. The LF and HF element division and array apertures can also be different.
    Type: Grant
    Filed: July 26, 2006
    Date of Patent: June 1, 2010
    Inventors: Bjørn A. J. Angelsen, Tonni F. Johansen, Rune Hansen, Svein-Erik Maasoey, Peter Näsholm
  • Patent number: 7699782
    Abstract: An ultrasound imaging probe for real time 3D ultrasound imaging from the tip of the probe that can be inserted into the body. The ultrasound beam is electronically scanned within a 2D azimuth plane with a linear array, and scanning in the elevation direction at right angle to the azimuth plane is obtained by mechanical movement of the array. The mechanical movement is either achieved by rotation of the array through a flexible wire, or through wobbling of the array, for example through hydraulic actuation. The probe can be made both flexible and stiff, where the flexible embodiment is particularly interesting for catheter imaging in the heart and vessels, and the stiff embodiment has applications in minimal invasive surgery and other procedures. The probe design allows for low cost manufacturing which allows factory sterilized probes to be disposed after use.
    Type: Grant
    Filed: March 9, 2005
    Date of Patent: April 20, 2010
    Inventors: Bjørn A. J. Angelsen, Tonni F. Johansen
  • Patent number: 7691060
    Abstract: An ultrasound probe for three-dimensional scanning and focusing of an ultrasound beam in both an azimuth direction and an elevation direction normal to the azimuth direction. The probe is composed of an ultrasound transducer array which has a linear division of the elements in the azimuth direction for electronic steering of the beam direction and focus in the azimuth direction. The array elements have a coarse division in the elevation direction for electronic steering of the focus in the elevation direction, and possibly small angle direction steering of the beam in the elevation direction for parallel receive and/or transmit beams. Large angle direction scanning of the beam in the elevation direction is obtained by mechanical rotation of the array around an axis. The invention implies useful embodiments for insertion of the probe into the body, through mounting the array at the distal tip of an elongated device.
    Type: Grant
    Filed: October 12, 2004
    Date of Patent: April 6, 2010
    Inventors: Bjørn A. J. Angelsen, Tonni F. Johansen
  • Publication number: 20100036244
    Abstract: Methods and instruments for suppression of multiple scattering noise and extraction of nonlinear scattering components with measurement or imaging of a region of an object with elastic waves, where elastic wave pulse complexes are transmitted towards said region where said pulse complexes are composed of a high frequency (HF) and a low frequency (LF) pulse with the same or overlapping beam directions and where the HF pulse is so close to the LF pulse that it observes the modification of the object by the LF pulse at least for a part of the image depth. The frequency and/or amplitude and/or phase of said LF pulse relative to said HF pulse varies for transmitted pulse complexes in order to nonlinearly manipulate the object elasticity observed by the HF pulse along at least parts of its propagation, and where received HF signals are picked up by transducers from one or both of scattered and transmitted components of the transmitted HF pulses.
    Type: Application
    Filed: July 9, 2009
    Publication date: February 11, 2010
    Inventors: Bjørn A.J. Angelsen, Rune Hansen, Tonni F. Johansen, Svein-Erik Masøy, Sven Peter Nasholm, Thor Tangen
  • Patent number: 7641613
    Abstract: A method for improved detection and imaging of ultrasound contrast agents using dual-band transmitted pulses, is described. The method is based on transmitting a pulse consisting of two frequency bands, a low frequency band which purpose is to manipulate the high frequency scattering properties of the contrast agent, and a high frequency band from which the image reconstruction is based. In addition, a general form of pulse subtraction is used to significantly suppress the received tissue signal.
    Type: Grant
    Filed: June 10, 2004
    Date of Patent: January 5, 2010
    Inventors: Bjørn A. J. Angelsen, Rune Hansen
  • Publication number: 20090247879
    Abstract: An ultrasound imaging probe for real time 3D ultrasound imaging from the tip of the probe that can be inserted into the body. The ultrasound beam is electronically scanned within a 2D azimuth plane with a linear array, and scanning in the elevation direction at right angle to the azimuth plane is obtained by mechanical movement of the array. The mechanical movement is either achieved by rotation of the array through a flexible wire, or through wobbling of the array, for example through hydraulic actuation. The probe can be made both flexible and stiff, where the flexible embodiment is particularly interesting for catheter imaging in the heart and vessels, and the stiff embodiment has applications in minimal invasive surgery and other procedures. The probe design allows for low cost manufacturing which allows factory sterilized probes to be disposed after use.
    Type: Application
    Filed: March 16, 2009
    Publication date: October 1, 2009
    Inventors: Bjorn A.J. Angelsen, Tonni F. Johansen
  • Publication number: 20090240152
    Abstract: A digital ultrasound beam former for ultrasound imaging, that can be configured by a control processor to process the signals from ultrasound transducer arrays with variable number of elements at variable sampling frequencies, where the lowest sampling frequency allows for the highest number of array elements. The maximal number of array elements is reduced in the inverse proportion to the sampling frequency. The beam former can be operated both in a RF-sampling mode and a quadrature mode. Parallel coupling of transmit/receive circuits for each element allow adaption of the receive Noise Figure and transmit drive capabilities to variations in the electrical impedance of the array elements.
    Type: Application
    Filed: March 30, 2009
    Publication date: September 24, 2009
    Inventors: Bjorn A.J. ANGELSEN, Tonni F. JOHANSEN
  • Publication number: 20090178483
    Abstract: Methods and instruments for suppressing multiple scattering noise and extraction of nonlinear scattering components with measurement or imaging of a region of an object with elastic waves, includes transmission of at least two elastic wave pulse complexes towards the region. The pulse complexes include a high frequency (HF) and a low frequency (LF) pulse. The HF pulse is so close to the LF pulse that it observes the modification of the object by the LF pulse at least for a part of the image depth. The frequency and/or amplitude and/or phase of said LF pulse relative to said HF pulse varies for each transmitted pulse complex to nonlinearly manipulate the object elasticity observed by the HF pulse along at least parts of its propagation, and received HF signals are picked up by transducers from at least one of scattered and transmitted components of the transmitted HF pulses. The received HF signals are processed to form measurement or image signals for display.
    Type: Application
    Filed: January 9, 2009
    Publication date: July 16, 2009
    Inventors: Bjorn A.J. ANGELSEN, Rune HANSEN, Tonni F. JOHANSEN, Svein-Erik MASOY, Sven Peter NASHOLM, Thor TANGEN
  • Publication number: 20090182237
    Abstract: An acoustic probe transmits/receives acoustic pulses with frequencies both in a high frequency (HF), and a selectable amount of lower frequency (LF1, LF2, . . . , LFn, . . . ) bands. The radiation surfaces of at least two of the multiple frequency bands have a common region. The arrays and elements can be of a general type such as annular arrays, phased or switched arrays, linear arrays with division in both azimuth and elevation direction, like a 1.5D, a 1.75D and a full 2D array, or curved arrays. The element division, array type, and array aperture sizes for the different bands can also be different.
    Type: Application
    Filed: January 9, 2009
    Publication date: July 16, 2009
    Inventors: Bjorn A.J. Angelsen, Tonni F. Johansen, Rune Hansen, Sven Peter Nasholm, Svein-Erik Masoy
  • Publication number: 20090039738
    Abstract: A design and a manufacturing method of ultrasound transducers based on films of ferro-electric ceramic material is presented, the transducers being particularly useful for operating at frequencies above 10 MHz. The manufacturing technique can involve tape-casting of the ceramic films, deposition of the ceramic films onto a substrate with thick film printing, sol-gel, or other deposition techniques, where manufacturing methods for load matching layers and composite ceramic layers are described. The designs also involve acoustic load matching layers that provide particularly wide bandwidth of the transducers, and also multi-band operation of the transducers. The basic designs can be used for elements in a transducer array, that provides the frequency characteristics of the single element transducers, for array steering of the focus and possibly also direction of a pulsed ultrasound beam at high frequencies and multi-band frequencies.
    Type: Application
    Filed: June 3, 2008
    Publication date: February 12, 2009
    Inventors: Bjorn A. J. Angelsen, Tonni F. Johansen, Helge Kristiansen
  • Patent number: 7300403
    Abstract: The invention presents solutions for large apertures of an ultrasound array under given dimension constraints given by the application for the ultrasound probe, for example by an endoluminal application. The invention has applications to annular arrays for 2D and 3D imaging, and also to linear or curvilinear arrays for 2D and 3D imaging. The invention further provides large aperture of arrays for dual frequency band operation with large difference between the dual bands.
    Type: Grant
    Filed: July 20, 2004
    Date of Patent: November 27, 2007
    Inventors: Bjørn A. J. Angelsen, Tonni F. Johansen, Rune Hansen, Peter Naesholm
  • Patent number: 7273455
    Abstract: An estimation method for correction filters for wavefront aberration correction in ultrasound imaging is given. The aberration is introduced due to spatial variations of the ultrasound propagation velocity in heterogeneous tissue. The correction filters are found as eigenvectors of the cross-correlation matrix of the element signals. In particular, the eigenvectors with a small spatial linear/plane phase component is sought. Detailed methods for calculating the eigenvectors are given.
    Type: Grant
    Filed: July 19, 2004
    Date of Patent: September 25, 2007
    Inventors: Bjørn A. J. Angelsen, Tonni F. Johansen, Trond Karsten Varslot