MRI safety system

• US 8,901,928 B2
• Filed: 11/09/2010
• Issued: 12/02/2014
• Est. Priority Date: 11/09/2010
• Status: Active Grant

• Current Assignee: Deerfield Imaging Incorporated
• Original Assignee: IMRIS Inc.
• Inventors: Alexiuk, Mark, Fallah-Rad, Mehran, Scarth, Gordon, Hushek, Stephen G., Champagne, Kirk Maurice, Hoeppner, Timothy James, Weber, David John Robert
• Primary Examiner(s): Vazquez, Arleen M
• Assistant Examiner(s): FETZNER, TIFFANY A
• Application Number:
  US12/942,522
• Publication Number:
  US 20120112747A1
• Time in Patent Office: 1,484 Days
• Field of Search: 324300-322, 600407-435, 382128-133, 560/1, 604/95.03, 606/32
• US Class Current: 324/318
• CPC Class Codes: G01R 33/288 Provisions within MR facilities for enhancing safety during MR, e.g. reduction of the specific absorption rate [SAR], detection of ferromagnetic objects in the scanner room

Abstract

In a MRI system housed within a room there is provided a movable magnet and additional components for other procedures on the patient, a control system is provided for the relative movement of the magnet and components. This includes a plurality of magnetic field sensors mounted on the components for measuring the magnetic field at the location of the component and an optional camera positioning system so that the control system can estimate relative positions of the components relative to the magnet from the sensed field strengths from the set of sensors to avoid collisions during the movements.

Claims

1. An apparatus configured for safely carrying out medical procedures including at least one magnetic resonance imaging procedure on a patient comprising:

an MR imaging room;

a magnetic resonance imaging apparatus including a movable magnet that is arranged to be located in the magnetic resonance imaging room and configured for generating a magnetic field of sufficient intensity in order to carry out a magnetic resonance imaging procedure on the patient while the patient is in the MR imaging room;

a plurality of additional components configured for use in carrying out at least one additional procedure on the patient;

wherein the magnetic field of the magnet extends to an area within the room outside of the magnet with a sufficient intensity that causes movement of ferro-magnetic material within the area, outside of the magnet into which the magnetic field of the magnet extends;

the magnet and/or the plurality of additional components being mounted and configured for relative movement with respect to one another whereby the magnetic resonance imaging procedure is carried out with the plurality of additional components in a remote location from the magnet and the at least one additional procedure is carried out with the magnet in a remote location from the plurality of additional components;

a control system configured for controlling the relative movement of the magnet and the plurality of additional components;

a plurality of magnetic field sensors each mounted on a respective one of the plurality of additional components, and configured for measuring the magnetic field of the magnet at the location of the respective one of the components onto which a respective one of the magnetic field sensors is mounted;

the magnetic field sensors each being arranged in order to provide a communication of signals with the control system;

the control system being arranged to change operation of the relative movement of the movable magnet and/or the plurality of additional components in response to the receipt of a communicated signal from one or more of the magnetic field sensors which are mounted onto the plurality of additional components;

whereby the control system uses the sensed magnetic field strength from the plurality of magnetic field sensors, which are mounted onto the plurality of additional components in order to avoid collisions during movements of the movable magnet, or movement of the plurality of additional components within the imaging room.

2. The apparatus according to claim 1 wherein each sensor mounted on one of the plurality of additional components measures the magnetic field strength in 3 perpendicular dimensions.

3. The apparatus according to claim 1 wherein the magnetic field sensors are mounted on both mobile and stationary objects, comprising booms, a surgical table, microscopes, instrument trays, kick buckets, foot pedals within the MR imaging room.

4. The apparatus according to claim 1 wherein the magnetic field sensors communicate by wireless communication from their respective mounted locations on the plurality of additional components back to the control system.

5. The apparatus according to claim 1 wherein the control system includes an audio/visual display.

6. The apparatus according to claim 1 wherein the control system includes a real-time asset tracking system of the plurality of additional components and the movable magnet.

7. The apparatus according to claim 1 wherein the control system is arranged in order to initiate movement of the magnet and the plurality of additional components from a potentially unsafe position to a pre-defined safe-position.

8. The apparatus according to claim 1 wherein the control system also comprises object avoidance mechanisms, as a safety feature, in order to avoid collision with persons and other objects in the MR imaging room.

9. The apparatus according to claim 1 wherein the magnet is movable and the control system is arranged in order to estimate a position of the magnet from the sensed field strengths from the set of magnetic field sensors.

10. The apparatus according to claim 9 wherein the control system is arranged in order to use information on the estimated position of the magnet in combination with the sensed magnetic field strength from the set of magnetic field sensors in order to anticipate collisions and initiate avoidance mechanisms.

11. The apparatus according to claim 1 wherein the control system is arranged to include a known position of a respective magnetic field sensor located on a respective one additional component of the plurality of additional components and a physical model of a shape of the component in order to provide a decision based on the current orientation of the respective additional component and the sensed field strength.

12. The apparatus according to claim 1 wherein there is provided at least one of the additional components in the room which does not have a respective one of the magnetic field sensors attached thereto, and there is also provided a system configured for communicating a position of said at least one of the plurality of additional components to the control system.

13. The apparatus according to claim 12 wherein said at least one of the plurality of additional components, is fixed.

14. The apparatus according to claim 12 wherein said system for communicating a position of said at least one of the additional components comprises a camera system.

15. The apparatus according to claim 1 wherein the control system is arranged in order to achieve an optimal configuration of the plurality of additional components in order to conduct a magnetic resonance imaging.

16. The apparatus according to claim 1 wherein the control system is arranged and configured to shut off RF noisy equipment before performing magnetic resonance image imaging.

17. Apparatus carrying out medical procedures including at least one magnetic resonance imaging procedure on a patient comprising:

an MR imaging room;

a patient support table within the MR imaging room

a magnetic resonance imaging apparatus including a movable magnet arranged to be located in the MR imaging room and configured for generating a magnetic field of sufficient intensity in order to carry out a magnetic resonance imaging procedure on the patient while the patient is in the room;

a plurality of additional components on configured for use in carrying out at least one additional procedure on the patient, the additional components being located in the MR imaging room at positions spaced away from the movable magnet;

wherein the magnetic field of the magnet extends to an area within the room outside of the magnet with a sufficient intensity that causes movement of ferro-magnetic material within the area, outside of the magnet into which the magnetic field of the magnet extents;

the magnet and/or the plurality of additional components being mounted and configured for relative movement with respect to the patient support table from a first position of the magnetic resonance imaging procedure on the patient to a second remote position configured for carrying out said at least one additional procedure on the patient;

a control system configured for controlling the relative movement of the magnet and the plurality of additional components;

a plurality of magnetic field sensors each mounted on a respective one of the plurality of additional components, and configured for measuring the magnetic field of the magnet at the location of the respective one of the components onto which a respective one of the magnetic field sensors is mounted;

the magnetic field sensors each being arranged in order to provide a communication of signals with the control system;

the control system being arranged to change operation of the relative movement of the movable magnet and/or the plurality of additional components in response to the receipt of a communicated signal from one or more of the magnetic field sensors which are mounted onto the plurality of additional components;

whereby the control system uses the sensed magnetic field strength from the plurality of magnetic field sensors, which are mounted onto the plurality of additional components in order to avoid collisions during movements of the movable magnet, or movement of the plurality of additional components within the imaging room.

18. The apparatus according to claim 17 wherein the control system is arranged in order to stop movement of the magnet.

19. Apparatus configured for safely carrying out medical procedures including at least one magnetic resonance imaging procedure on a patient comprising:

an MR imaging room;

a magnetic resonance imaging apparatus including a movable magnet that is arranged to be located in the magnetic resonance imaging room and configured for generating a magnetic field of sufficient intensity in order to carry out a magnetic resonance imaging procedure on the patient while the patient is in the MR imaging room;

a plurality of additional components configured for use in carrying out at least one additional procedure on the patient;

wherein the magnetic field of the magnetic extends to an area within the room outside of the magnet with a sufficient intensity that causes movement of ferro-magnetic material within the area, outside of the magnet into which the magnetic field of the magnet extends;

the magnet and/or the plurality of additional components being mounted and configured for relative movement with respect to on another whereby the magnetic resonance imaging procedure is carried out with the plurality of additional components in a remote location from the magnet and the at least one additional procedure is carried out with the magnet in a remote location from the plurality of additional components;

a control system configured for controlling the relative movement of the magnet and the plurality of additional components;

a plurality of magnetic field sensors each mounted on a respective one of the plurality of additional components, and configured for measuring the magnetic field of the magnet at the location of the respective one of the components onto which a respective one of the magnetic field sensors is mounted;

the magnetic field sensors each being arranged in order to provide a communication of signals with the control system;

the control system being arranged to change operation of the relative movement of the movable magnet and/or the plurality of additional components in response to the receipt of a communicated signal from one or more of the magnetic field sensors which are mounted onto the plurality of additional components;

wherein the control system is arranged to estimate relative positions of the movable magnet and/or the plurality of additional components relative to the magnet from the sensed field strengths from the set of sensors which are mounted onto the plurality of additional components;

whereby the control system uses the sensed magnetic field strength from the plurality of magnetic field sensors, which are mounted onto the plurality of additional components in order to avoid collisions during movements of the movable magnet, or movement of the plurality of additional components within the imaging room.