Patents Assigned to Elekta Instrument
  • Patent number: 11351396
    Abstract: Methods for dose or treatment planning for a radiotherapy system including a radiotherapy unit are provided. A spatial dose delivered can be changed by adjusting beam shape settings, and the delivered radiation is determined using an optimization problem that steers the delivered radiation according to objectives reflecting criteria for regions of interest including at least one of: targets to be treated during treatment of the patient, organs at risk and/or healthy tissue. The method includes determining an inner set of voxels and providing a first frame description for the inner set of voxels, where the first frame description reflects criteria for the inner set of voxels. Determining an outer set of voxels encompassing the target volume and the inner set of voxels and a frame description for the outer set of voxels is provided where each reflecting criteria for the outer set of voxels. The frame descriptions are then used in the optimization problem that steers the delivered radiation.
    Type: Grant
    Filed: February 21, 2019
    Date of Patent: June 7, 2022
    Assignee: ELEKTA INSTRUMENT AB
    Inventors: Håkan Nordström, Stella Riad, Jens Sjölund
  • Publication number: 20210268314
    Abstract: The present invention relates to the field of radiation therapy and methods, software and systems for treatment planning. A target volume of a region of a patient to be treated during a treatment of a patient in a radiation therapy unit is obtained. A first Isocenter location procedure is performed including inter alia evaluating potential isocenter locations along normal directions of the surface and respective isodistance surfaces in respective starting voxel in a direction inwards from the surface, and a second isocenter location procedure is performed including inter alia identifying a median axis of the target volume or center point of the target volume, placing isocenters at locations along the median axis, placing isocenters in the target volume based on a distance to existing isocenters and to the target surface.
    Type: Application
    Filed: March 2, 2020
    Publication date: September 2, 2021
    Applicant: Elekta Instrument AB
    Inventors: Håkan Nordström, Joakim Wang Erlandsson, Fredrik Lundqvist, Marcus Hennix, Björn Somell
  • Patent number: 10888711
    Abstract: In the field of radiotherapy, methods for dose or treatment planning for a radiotherapy system are disclosed, wherein a spatial dose delivered can be adjusted and delivered radiation is determined using an optimization problem that steers the delivered radiation according to a frame description reflecting criteria for regions of interest that include at least one of targets to be treated during treatment of the patient, organs at risk and/or healthy tissue. The method includes estimating a voxel set receiving a higher dose than a predetermined threshold dose level, which voxel set includes voxels from at least one target volume. Further, a low dose voxel set is determined and a frame description for the voxels in the low dose voxel set is provided where voxels receiving a dose exceeding a predetermined threshold value is penalized such that the dose delivered to the low dose voxel set is suppressed. The frame description is then used in the optimization problem that steers the delivered radiation.
    Type: Grant
    Filed: February 21, 2019
    Date of Patent: January 12, 2021
    Assignee: ELEKTA INSTRUMENTS AB
    Inventors: Håkan Nordström, Björn Somell, Stella Riad, Jens Sjölund
  • Publication number: 20200330796
    Abstract: A method for treatment planning for a radiation therapy system includes setting a number of objectives reflecting clinical criteria are set for the regions of interest and generating radiation dose profiles to be delivered to these regions of interest. A convex optimization function for optimizing the delivered radiation based on the objectives is provided and dose profiles for specific treatment configurations including beam shape settings for the radiation dose profiles are calculated using the convex optimization function. Treatment plans including determining the radiation dose profiles to be delivered during treatment based on the treatment configurations are created and an optimal treatment plan that satisfies the clinical criteria is selected.
    Type: Application
    Filed: July 2, 2020
    Publication date: October 22, 2020
    Applicant: ELEKTA INSTRUMENT AB
    Inventors: Jens SJÖLUND, Håkan NORDSTRÖM
  • Patent number: 10744343
    Abstract: The present invention relates to the field of radiation therapy. In particular, the present invention relates to methods for treatment planning for a radiation therapy system. The method includes setting a number of objectives reflecting clinical criteria are set for the regions of interest and generating radiation dose profiles to be delivered to these regions of interest. A convex optimization function for optimizing the delivered radiation based on the objectives is provided and dose profiles for specific treatment configurations including beam shape settings for the radiation dose profiles are calculated using the convex optimization function. Treatment plans including determining the radiation dose profiles to be delivered during treatment based on the treatment configurations are created and an optimal treatment plan that satisfies the clinical criteria is selected.
    Type: Grant
    Filed: April 28, 2017
    Date of Patent: August 18, 2020
    Assignee: ELEKTA INSTRUMENT AB
    Inventors: Jens Sjölund, Håkan Nordström
  • Patent number: 6049587
    Abstract: A radiotherapy appliance having a plurality of controllable radiation beams which converge on a focus volume wherein an object being irradiated can be movably positioned relative to the focus volume for varying time periods and with varying radiation exposure rates, optimally under control of a computer. The computer controls the focus volume radiation beam size, intensity, and exposure time for subareas of the treatment target in response to a radiation dose distribution determined for the treatment target. A determination of the radiation beam size, intensity, and dwell time of the focus volume in the target area, is made by initially dividing up the specified treatment area into volume elements or voxels and having biological characteristics of the treatment area assigned to each voxel. The energy deposition incident to each voxel to provide this biological characteristic is then calculated.
    Type: Grant
    Filed: October 8, 1997
    Date of Patent: April 11, 2000
    Assignee: Elekta Instruments AB
    Inventors: Dan Leksell, Borje Nilsson
  • Patent number: 5805661
    Abstract: A radiotherapy appliance having a plurality of controllable radiation beams which converge on a focus volume wherein an object being irradiated can be movably positioned relative to the focus volume for varying time periods and with varying radiation exposure rates, optimally under control of a computer. The computer controls the focus volume radiation beam size, intensity, and exposure time for subareas of the treatment target in response to a radiation dose distribution determined for the treatment target. A determination of the radiation beam size, intensity, and dwell time of the focus volume in the target area, is made by initially dividing up the specified treatment area into volume elements or voxels and having biological characteristics of the treatment area assigned to each voxel. The energy deposition incident to each voxel to provide this biological characteristic is then calculated.
    Type: Grant
    Filed: January 8, 1997
    Date of Patent: September 8, 1998
    Assignee: Elekta Instrument AB
    Inventors: Dan Leksell, Borje Nilsson
  • Patent number: 5681326
    Abstract: A stereotactical instrument for identifying a spatial position of an area in a patient's body which is to be subjected to treatment, preferably radiation treatment, the position of the area being previously determined, for example, by an angiogram, PET, DSA, CT, MRI, or X-ray equipment.
    Type: Grant
    Filed: November 3, 1995
    Date of Patent: October 28, 1997
    Assignee: Elekta Instrument AB
    Inventor: Ingemar Lax
  • Patent number: 5629967
    Abstract: A radiotherapy appliance having a plurality of controllable radiation beams which converge on a focus volume wherein an object being irradiated can be movably positioned relative to the focus volume for varying time periods and with varying radiation exposure rates, optimally under control of a computer. The computer controls the focus volume radiation beam size, intensity, and exposure time for subareas of the treatment target in response to a radiation dose distribution determined for the treatment target. A determination of the radiation beam size, intensity, and dwell time of the focus volume in the target area, is made by initially dividing up the specified treatment area into volume elements or voxels and having biological characteristics of the treatment area assigned to each voxel. The energy deposition incident to each voxel to provide this biological characteristic is then calculated.
    Type: Grant
    Filed: February 13, 1996
    Date of Patent: May 13, 1997
    Assignee: Elekta Instrument AB
    Inventors: Dan Leksell, Borje Nilsson
  • Patent number: 5605080
    Abstract: The present invention involves screwdriver having a grip, a driver blade insertable into and rotationally affixed to said grip and a chuck. The chuck encloses and is longitudinally displaceable relative to the driver blade. The chuck has collets extending from an end disposed near the blade tip. The collets have claws extending from their free ends which are adapted to retain a screw on the blade tip when the chuck is in a retaining position. The collets may be either inwardly biased or outwardly biased. A sleeve, for pressing the collets inward, is provided for embodiments employing outwardly biased collets. A stop device is provided for inhibiting the longitudinal displacement of the chuck towards the blade tip beyond the retaining position. The stop device comprises a groove in the blade shaft and a cooperating detent spring located on the chuck. The free end of the detent spring extends toward the blade tip and is biased inward so that it is disposed within the groove.
    Type: Grant
    Filed: November 27, 1995
    Date of Patent: February 25, 1997
    Assignee: Elekta Instrument GmbH
    Inventors: Joachim Pfefferle, Michael Roth, Peter Scheuble, Hermann Zeuner
  • Patent number: 5528651
    Abstract: A radiotherapy appliance having a plurality of controllable radiation beams which converge on a focus volume wherein an object being irradiated can be movably positioned relative to the focus volume for varying time periods and with varying radiation exposure rates, optimally under control of a computer. The computer controls the focus volume radiation beam size, intensity, and exposure time for subareas of the treatment target in response to a radiation dose distribution determined for the treatment target. A determination of the radiation beam size, intensity, and dwell time of the focus volume in the target area, is made by initially dividing up the specified treatment area into volume elements or voxels and having biological characteristics of the treatment area assigned to each voxel. The energy deposition incident to each voxel to provide this biological characteristic is then calculated.
    Type: Grant
    Filed: June 9, 1994
    Date of Patent: June 18, 1996
    Assignee: Elekta Instrument AB
    Inventors: Dan Leksell, Borje Nilsson
  • Patent number: 5116344
    Abstract: Apparatus for marking a predetermined position of a target for surgical treatment within a patient's brain, comprises a frame for fixedly embracing the patient's skull and having at one side thereof a side-piece provided with a guide extending along a first line, a first support member mounted to the guide for adjustment along the first line and along a second line perpendicular to the first line, a rotatable member supported on the first support member for rotation about a third line perpendicular to the first and second lines, a second support member spaced from the third line and including an arm having a first end attached to the rotatable member and extending longitudinally parallel to the third line in a direction away from a side of the frame opposite the aforementioned one side, the arm thus being adjustable about the third line by rotation of the rotatable member, an arcuate support member mounted to the arm for adjustment along the third line and for adjustment transversely of the arm along an arcua
    Type: Grant
    Filed: August 22, 1991
    Date of Patent: May 26, 1992
    Assignee: Elekta Instrument AB
    Inventor: Hans Sundqvist
  • Patent number: 4780898
    Abstract: An arrangement in a gamma unit, comprising a large number of radiation sources (9) mounted within a radiation shield (2) and having beam channels (6, 19) directed radially from said radiation sources toward a common focal point (F), said radiation shield comprising a space adapted to accommodate the head of a patient resting on a support.The novel matter resides in that the radiation sources (9) and the beam channels (6, 19) directed radially therefrom toward the focal point are located, in relation to the diametrical plane through the opening to the space, within a zone extending to latitudes 30.degree.-45.degree., as seen from said diametrical plane.
    Type: Grant
    Filed: April 30, 1987
    Date of Patent: October 25, 1988
    Assignee: Elekta Instrument
    Inventor: Hans Sundqvist