Picker International, Inc.

Koninklijke Philips Corporation N.v.

Viewray Technologies, Inc.

Viewray, Incorporated

Picker Nordstar Corporation

Philips Medical Systems (cleveland), Inc.

Viewray Systems, Inc.

Marconi Medical Systems, Inc.

Koninklijke Philips Electronics N.v.

Philips Intellectual Property & Standards Gmbh

Gordon D DeMeester

Michael Andrew Morich

John Lester Patrick

Shmaryu M Shvartsman

James F Dempsey

Zhiyong Zhai

Volkmar Schulz

Torsten Solf

G Neil Holland

Ian R Young

Paul Royston Harvey

Rodney Arnold Mattson

Haiying Liu

Hiroyuki Fujita

Ilmari V Kinanen

Johan Overweg

Kenneth S Denison

Francis H Bearden

John V McGinley

John V M McGinley

Vishnu C Srivastava

Christoph G Leussler

Gosta J Ehnholm

Kecheng Liu

Michael Burl

Jerome John Griesmer

John L Patrick, Iii

William H Amor, Sr

Robert Gauss

Robert G Gylling

Daniel Gagnon

Christian Findeklee

Labros S Petropoulos

Heang K Tuy

Mark J Loncar

Jarmo Ruohonen

Rao P Gullapalli

James M McNally

William O Braum

Xueming Zou

Bjoern Weissler

Timothy P Eagan

Bradford W Petot

Kevin Patrick McMahon

Kai-Michael Luedeke

William Amor

Kevin Nieman

Robert C Gauss

Junxiao Ling

Gerardus B J Mulder

James L Gruden

Terrence J Provost

Narasimharao Koka

C Michael Steckner

Eddy Yu Ping Wong

Clarence E Payton

Jerome S Alden

Robert K Carlson

Torsten J Solf

Johan A Overweg

Michael A Morich

A radiation therapy system comprises a magnetic resonance imaging (MRI) system combined with an irradiation system, which can include one or more linear accelerators (linacs) that can emit respective radiation beams suitable for radiation therapy. The MRI system includes a split magnet system, comprising first and second main magnets separated by gap. A gantry is positioned in the gap between the main MRI magnets and supports the linac(s) of the irradiation system. The gantry is rotatable independently of the MRI system and can angularly reposition the linac(s). Shielding can also be provided in the form of magnetic and/or RF shielding. Magnetic shielding can be provided for shielding the linac(s) from the magnetic field generated by the MM magnets. RF shielding can be provided for shielding the MRI system from RF radiation from the linac.

Method and apparatus for shielding a linear accelerator and a magnetic resonance imaging device from each other

A radiation therapy system comprises a magnetic resonance imaging (MRI) system combined with an irradiation system, which can include one or more linear accelerators (linacs) that can emit respective radiation beams suitable for radiation therapy. The MRI system includes a split magnet system, comprising first and second main magnets separated by gap. A gantry is positioned in the gap between the main MRI magnets and supports the linac(s) of the irradiation system. The gantry is rotatable independently of the MRI system and can angularly reposition the linac(s). Shielding can also be provided in the form of magnetic and/or RF shielding. Magnetic shielding can be provided for shielding the linac(s) from the magnetic field generated by the MRI magnets. RF shielding can be provided for shielding the MRI system from RF radiation from the linac.

Gradient coil assemblies for horizontal magnetic resonance imaging systems (MRIs) and methods of their manufacture. Some embodiments may be used with open MRIs and can be used with an instrument placed in the gap of the MRI. In general, concentrations of conductors or radially oriented conductors may be moved away from the gap of the MRI so as to reduce eddy currents that may be induced in any instrument placed within the gap. Systems for directly cooling primary gradient and shield coils may be utilized and various coil supporting structures may be used to assist in coil alignment or to facilitate use of an instrument in the MRI gap.

Self-shielded split gradient coil

A magnetic resonance imaging (MRI) system includes a split magnet system having a pair of MRI magnet housings separated by gap. A pair of main MRI magnets are disposed within respective MRI magnet housings. A plurality of buttress assemblies are attached to the MRI magnet housings. Some or all of the buttress assemblies are provided with removable connections to the MRI magnet housings. This allows for partial disassembly of the MRI system for improved transport and maneuverability for relocating the MRI system. The MRI system can include a gantry in the gap for supporting a radiation therapy system. Also, the removably buttress assemblies can be used for housing conduits, such as electrical and fluid conduits, between the pair of MRI magnet housings.

Split magnetic resonance imaging system

In preparation for acquiring PET image data, subject motion models are built based on physiologic signal monitoring and MR data is collected and used for improved PET imaging. The physiologic signal monitoring is also used during PET imaging, and the acquired MR data is used for prospective or retrospective gating of the PET image acquisition, or in the PET reconstruction for improved correction/imaging.

MR-PET cyclic motion gating and correction

An imaging method comprises: acquiring magnetic resonance data of a subject using a magnetic resonance component (') disposed with the subject; acquiring nuclear imaging data of the subject with the magnetic resonance component disposed with the subject; determining a position of the magnetic resonance component respective to a frame of reference of the nuclear imaging data; and reconstructing the nuclear imaging data () to generate a nuclear image () of at least a portion of the subject. The reconstructing includes adjusting at least one of the nuclear imaging data and the nuclear image based on a density map () of the magnetic resonance component and the determined position of the magnetic resonance component respective to the frame of reference of the nuclear imaging data to correct the nuclear image for radiation absorption by the magnetic resonance component.

Hybrid MR/PET with correction for radiation absorption by MR coil

A generally cylindrical set of coil windings includes primary coil windings and shield coil windings at a larger radial position than the primary coil windings, and an arcuate or annular central gap that is free of coil windings, has an axial extent of at least ten centimeters, and spans at least a 180&#xb0; angular interval. Connecting conductors disposed at each edge of the central gap electrically connect selected primary and secondary coil windings. In a scanner setting, a main magnet is disposed outside of the generally cylindrical set of coil windings. In a hybrid scanner setting, an annular ring of positron emission tomography (PET) detectors is disposed in the central gap of the generally cylindrical set of coil windings.

Split gradient coil and hybrid systems using same

Active resistive shim coil assemblies may be used in magnetic resonance imaging (MRI) systems to reduce in-homogeneity of the magnetic field in the imaging volume. Disclosed embodiments may be used with continuous systems, gapped cylindrical systems, or vertically gapped systems. Disclosed embodiments may also be used with an open MRI system and can be used with an instrument placed in the gap of the MRI system. An exemplary embodiment of the active resistive shim coil assembly of the present disclosure includes active resistive shim coils each operable to be energized by separate currents through a plurality of power channels. In some embodiments, the disclosed active resistive shim coil assemblies allow for various degrees of freedom to shim out field in-homogeneity.

Active resistive shimming fro MRI devices

Self-shielded gradient coil

Growing community of inventors

Wickliffe, OH, United States of America

Gordon D DeMeester