Patents by Inventor Cornelis Leonardus Ham

Cornelis Leonardus Ham 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: 20070080689
    Abstract: The invention relates to a magnetic resonance imaging (MRI) system comprising a main magnet system for generating a main magnetic field in an examination volume, a gradient coil system (1) which is substantially arranged between the main magnet system and the examination volume and which comprises sub-gradient coils (4,5,6) embedded in a binding material (11) having a glass temperature, control means (13) for controlling a temperature of the gradient coil system, and temperature-influencing means for influencing the temperature of the gradient coil system on the basis of control signals supplied by the control means. The control means are suitable to control, during operation of the MRI system, the temperature of the binding material of the gradient coil system to a value above the glass temperature. The invention further relates to a method of using a magnetic resonance imaging (MRI) system.
    Type: Application
    Filed: November 17, 2004
    Publication date: April 12, 2007
    Inventors: Jan Konijn, Cornelis Leonardus Ham
  • Publication number: 20060273793
    Abstract: The invention provides a magnetic resonance imaging (MRI) device (21), comprising a diagnostic space (25), a main magnetic system (22) for generating a main magnetic field in said diagnostic space, a gradient magnetic coil system (23) comprising a gradient coil for generating at least one gradient of the main magnetic field, and noise reducing means (29, 32) for reducing noise that is generated as a result of vibrations of the gradient coil. The noise reducing means comprise a sound-absorbing panel (29) disposed between the gradient coil and the diagnostic space. The sound-absorbing panel (29) comprises channels having an open end and a closed end.
    Type: Application
    Filed: May 17, 2004
    Publication date: December 7, 2006
    Inventors: Nicolaas Roozen, Robert Kleihorst, Cornelis Leonardus Ham, Martijn La Grange
  • Publication number: 20050285594
    Abstract: The invention relates to a magnetic resonance imaging (MRI) system (1) comprising an examination volume (111), a main magnet system (13) for generating a main magnetic field (B0) in the examination volume in a Z-direction, a gradient magnet system (19) for generating gradients of the main magnetic field, and an anti-vibration system (33) for reducing vibrations of the gradient magnet system caused by a mechanical load (MX, MY) exerted on the gradient magnet system as a result of electromagnetic interaction between the main magnetic field and electrical currents in the gradient magnet system. According to the invention the anti-vibration system (33) comprises a balance member (39), which is coupled to the gradient magnet system (19) by means of an actuator system (51) and a coupling device (49) allowing displacements of the balance member relative to the gradient magnet system.
    Type: Application
    Filed: October 27, 2003
    Publication date: December 29, 2005
    Inventors: Nicolaas Roozen, Cornelis Leonardus Ham, Paul Harvey, Patrick Limpens
  • Publication number: 20050122106
    Abstract: The invention relates to a gradient coil arrangement for the generation of a gradient magnetic field for an MR arrangement with at least two gradient coils arranged on a cylinder surface with a substantially circular cross section. In order to enable adjustment of gradient fields extending as linearly as possible in the area of an object to be examined without having to modify the entire mechanical structure of the MR arrangement and without having to increase the power required to feed the gradient coil arrangement, it is proposed according to the invention to configure the gradient coils so as to be asymmetrical in relation to a central plane lying horizontally through the longitudinal axis of the cylinder.
    Type: Application
    Filed: December 16, 2002
    Publication date: June 9, 2005
    Inventors: Cornelis Leonardus Ham, Johannes Overweg, Gerardus Peeren
  • Publication number: 20050068032
    Abstract: The invention relates to an open magnetic resonance imaging (MRI) magnet system (1) for use in a medical imaging system. The open MRI magnet system has two main coil units which are accomodated, at some distance from each other, in a first housing (2) and in a second housing (3), respectively. Between the two housings, an imaging volume (6) is present wherein a patient to be examined is placed. A gradient coil unit (9, 10) facing the imaging volume is present near a side of each of the two housings. Functional connections of the gradient coil units (9, 10), such as electrical power supply lines (13, 14) and cooling channels (15, 16) are provided in a central passage (4, 5) which is present in each of the two housings. As a result, these functional connections do not reduce the space in the imaging volume available for the patient.
    Type: Application
    Filed: November 20, 2002
    Publication date: March 31, 2005
    Inventors: Paul Harvey, Johannes Overweg, Cornelis Leonardus Ham, Nicolaas Roozen, Patrick Limpens