公开(公告)号：US20220113360A1

公开(公告)日：2022-04-14

申请号：US17559957

申请日：2021-12-22

Applicant: ViewRay Technologies, Inc.

Inventor： James F. DEMPSEY ,  Massimo DAL FORNO ,  Shmaryu M. SHVARTSMAN ,  David L. RAYNER

IPC: G01R33/381 ,  A61B5/055 ,  G01R33/38 ,  G01R33/34

Abstract: A magnetic resonance imaging (MRI) system having a resistive, solenoidal electromagnet for whole-body MRI may include ferromagnetic material within an envelope of the electromagnet. The system can be configured to have a field strength of at least 0.05 Tesla and its main electromagnetic field can be generated by layers of conductors instead of bundles. Certain electromagnet designs may be fabricated using non-metallic formers, such as fiberglass, and can be constructed to form a rigid object with the layers of conductors by fixing all together with an epoxy. The electromagnet may be configured to have two separated halves, which may be held apart by a fixation structure such as carbon fiber. The power supply for certain electromagnets herein may have current fluctuations, at frequencies of 180 Hz or above, of at least one part per ten thousand without requiring an additional current filter.

公开(公告)号：US20190353725A1

公开(公告)日：2019-11-21

申请号：US16179764

申请日：2018-11-02

Applicant: ViewRay Technologies, Inc.

Inventor： James F. DEMPSEY ,  Massimo DAL FORNO ,  Shmaryu M. SHVARTSMAN ,  David L. RAYNER

IPC: G01R33/381 ,  A61B5/055 ,  G01R33/38 ,  G01R33/34

Abstract: A magnetic resonance imaging (MRI) system having a resistive, solenoidal electromagnet for whole-body MRI may include ferromagnetic material within an envelope of the electromagnet. The system can be configured to have a field strength of at least 0.05 Tesla and its main electromagnetic field can be generated by layers of conductors instead of bundles. Certain electromagnet designs may be fabricated using non-metallic formers, such as fiberglass, and can be constructed to form a rigid object with the layers of conductors by fixing all together with an epoxy. The electromagnet may be configured to have two separated halves, which may be held apart by a fixation structure such as carbon fiber. The power supply for certain electromagnets herein may have current fluctuations, at frequencies of 180 Hz or above, of at least one part per ten thousand without requiring an additional current filter.

公开(公告)号：US20210096198A1

公开(公告)日：2021-04-01

申请号：US17086037

申请日：2020-10-30

Applicant: ViewRay Technologies, Inc.

Inventor： Shmaryu M. SHVARTSMAN ,  Gordon D. DEMEESTER ,  John L. PATRICK ,  James F. DEMPSEY

IPC: G01R33/38 ,  G01R33/385 ,  G01R33/421 ,  G01R33/48

Abstract: 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.

公开(公告)号：US20190219650A1

公开(公告)日：2019-07-18

申请号：US16195673

申请日：2018-11-19

Applicant: ViewRay Technologies, Inc.

Inventor： Shmaryu M. SHVARTSMAN ,  Gordon D. DEMEESTER ,  John L. PATRICK ,  James F. DEMPSEY

IPC: G01R33/38 ,  G01R33/385 ,  G01R33/48 ,  G01R33/421

CPC classification number: G01R33/3806 ,  A61N2005/1055 ,  G01R33/385 ,  G01R33/3856 ,  G01R33/3858 ,  G01R33/4215 ,  G01R33/4808

Abstract: 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.