WO2012154961A2 - Rf enclosures configured to cooperate with waveguides in mri suites to provide cable connections between rooms - Google Patents

Rf enclosures configured to cooperate with waveguides in mri suites to provide cable connections between rooms Download PDF

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Publication number
WO2012154961A2
WO2012154961A2 PCT/US2012/037334 US2012037334W WO2012154961A2 WO 2012154961 A2 WO2012154961 A2 WO 2012154961A2 US 2012037334 W US2012037334 W US 2012037334W WO 2012154961 A2 WO2012154961 A2 WO 2012154961A2
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WIPO (PCT)
Prior art keywords
waveguide
rf
enclosure
rf enclosure
housing
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Application number
PCT/US2012/037334
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French (fr)
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WO2012154961A3 (en
Inventor
Kamal Vij
Peter Piferi
Daniele Ghidoli
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MRI Interventions, Inc.
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Priority to US201161485365P priority Critical
Priority to US61/485,365 priority
Application filed by MRI Interventions, Inc. filed Critical MRI Interventions, Inc.
Publication of WO2012154961A2 publication Critical patent/WO2012154961A2/en
Publication of WO2012154961A3 publication Critical patent/WO2012154961A3/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00Arrangements or instruments for measuring magnetic variables
    • G01R33/20Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/42Screening
    • G01R33/422Screening of the radio frequency field

Abstract

The disclosure describes RF enclosures configured to mount to an existing waveguide channel in an RF shielded wall of an MRI suite using a tubular waveguide that can be slidably inserted into the existing channel. The tubular waveguide can electrically and mechanically couple to the existing waveguide channel to provide an electrical ground.

Description

RF ENCLOSURES CONFIGURED TO COOPERATE WITH WAVEGUIDES IN MRI SUITES TO PROVIDE CABLE CONNECTIONS BETWEEN ROOMS

Related Applications

[0001] This application claims the benefit of and priority to U.S. Provisional

Patent Application Serial No. 61/485,365, filed May 12, 201 1 , the contents of which are hereby incorporated by reference as if recited in full herein.

Field of the Invention

[0002] The present invention relates generally to interfaces that direct leads from devices in a control room to devices in an MRI Scanner room using existing (pre-installed) waveguides for facilitating installation of MRI-guided interventional systems.

Background of the Invention

[0003] MRI suites have a control room with MRI Scanner operating components such as an RF amplifier and control cabinet (typically called the control room) and a separate room or chamber holding a high field magnet in which a patient is placed for an MRI procedure (typically called the Scanner room). An RF-shielded wall or penetration panel separates the two rooms. RF Shielding is important because it isolates the MRI scanner from external RF sources that can cause artifacts in the MRI image. For a typical MRI scanner chamber, the RF shielding causes at least lOOdB of signal attenuation of signals in the frequency range of lHz to 150MHz. Holes or openings made in this shielding can compromise the shielding effectiveness.

[0004] In order to allow access in the MRI scanner chamber for non-metallic conduits of water, medical gas or optical data lines, special waveguides can be installed in the RF shielded room. On the outside, these waveguides are typically electrically connected to the room shielding. Waveguide depth and diameter is based on the fact that an electromagnetic field attenuates rapidly down a small diameter hole of sufficient depth, providing certain conditions are met. Using the waveguide in this manner is commonly called 'waveguide below cutoff . This guideline allows small diameter holes to be made in conductive enclosures, as may be needed for ventilation, or as a pass-through for non-metallic members.

[0005] In addition, RF filters are typically mounted on the RF shield and create a penetration point for electrical power, data cables and the like, This is typically carried out using a removable portion of the RF shield which is called a penetration panel.

[0006] MRI-guided interventional surgeries can require many types of electrical leads to properly operate. For example, U.S. Patent Application Serial No. 12/236,854, entitled MRI Surgical Systems For Real-Time Visualizations Using MRI Image Data And Predefined Data Of Surgical Tools describes components of , inter alia, a neurosurgery system also known as the CLEARPOINT® intervention system (from MRI Interventions, Inc., Memphis, TN) that can have connections or leads for MRI compatible cameras, data cable, mouse or trackball lead, monitor leads, and/or other electrical inputs that use RF filters. In the past, relatively large "custom" openings were cut into penetration panels to support the required cabling for the intervention systems.

Summary of Embodiments of the Invention

[0007] Embodiments of the invention provide a compact RF enclosure (with

RF filters) that is supported by a waveguide in a pre-installed (e.g., pre-existing, electrically grounded) portal (also called a waveguide) in a wall with an RF shield of an MRI suite, such as an OEM installed portal in a penetration panel, thus not requiring additional and/or custom portals to be formed in MR RF shielded walls to accommodate the MRI guided surgical systems.

[0008] In some embodiments, the RF enclosure is an RF shielded housing that can be configured as an in-room (Scanner room with magnet side) box that is attached to the penetration panel using a waveguide in a channel extending through the panel/wall and which may include DC filters and optionally camera filters.

[0009] In some embodiments, the RF enclosure is an RF shielded housing that can be configured as an in-room (control room side) box that is attached to the penetration panel using a waveguide in a channel extending through the panel/wall and which may include DC filters and optionally camera filters. [0010] Embodiments of the invention are directed to RF enclosures for an

MRI suite that include an RF shielded housing configured to mount to a pre-existing waveguide channel in a wall of an MRI suite, the housing having an enclosed interior space and a first tubular waveguide that extends outwardly from a first wall of the housing, the first tubular waveguide sized and configured to slidably engage and electrically connect to the pre-existing waveguide channel.

[0011] The RF enclosures can optionally include a tubular waveguide extension that extends outwardly from a second wall of the housing.

[0012] The housing can be supported by the first waveguide when the first waveguide snugly attaches to the waveguide channel.

[0013] The first tubular waveguide can include a plurality of longitudinally spaced apart, radially outwardly extending flexible conductive members that are sized and configured to electrically and mechanically couple to the pre-existing waveguide.

[0014] The outwardly extending flexible members, where used, can comprise flexible copper rings that are configured to provide low impedance electrical contact the first tubular waveguide and a wall of the waveguide channel.

[0015] The enclosure can include at least one DC filter held inside or on the housing. In operative position, the housing can be configured to provide an electrical ground for the at least one DC filter.

[0016] The RF enclosure can optionally include at least one camera filter held inside or on the housing.

[0017] The RF enclosure can include an externally accessible cable connector.

[0018] The first tubular waveguide can have an outer diameter of about 2.800 inches.

[0019] The first tubular waveguide can have an outer diameter that is greater than an outer diameter of the waveguide extension (where used).

[0020] The RF enclosure can include a plurality of cables that extend through the first tubular waveguide into the housing and the housing can hold at least one RF filter that is connected to at least one of the cables in the enclosure.

[0021] Other aspects of the invention are directed to MRI suites that include:

(a) a scanner room; (b) a control room; (c) an RF shielded wall having a waveguide channel that extends between the scanner and control rooms; and (d) an RF enclosure with an outwardly extending tubular waveguide sized and configured to extend through and electrically engage the waveguide channel so that the RF enclosure is supported by the outwardly extending tubular waveguide and the tubular waveguide provides an electrical ground.

[0022] The RF enclosure can optionally include a waveguide extension that extends outwardly from the RF enclosure in a direction away from the tubular waveguide. The tubular waveguide has an outer diameter that can be greater than an outer diameter of the waveguide extension.

[0023] The tubular waveguide can include a plurality of longitudinally spaced apart, radially outwardly extending flexible conductive members that are sized and configured to electrically and mechanically snugly couple to an inner surface of a wall of the waveguide channel.

[0024] The outwardly extending flexible members, where used, are flexible copper rings that are configured to provide low impedance electrical contact the first tubular waveguide and the waveguide channel.

[0025] The RF enclosure can include at least one DC filter held inside or on the RF enclosure. In operative position, the RF enclosure can be configured to provide an electrical ground for the at least one DC filter.

[0026] The RF enclosure can include at least one camera filter held inside or on the RF enclosure.

[0027] The RF enclosure can reside in the scanner room and the tubular waveguide can extend toward the control room.

[0028] The RF enclosure can reside in the control room and the tubular waveguide can extend toward the scanner room.

[0029] The tubular waveguide can have an outer diameter of about 2.800 inches.

[0030] Yet other embodiments are directed to methods of mounting an RF enclosure holding a plurality of RF filters using an existing electrically grounded portal in an MRI control room or MRI Scanner room. The methods include: (a) slidably inserting a tubular waveguide into a pre-existing waveguide channel in an RF shielded wall of an MR so that the tubular waveguide snugly resides against an inner surface of the waveguide channel; (b) attaching an RF enclosure housing to one end portion of the tubular waveguide, before or after the inserting step; and (c) routing cables through the tubular waveguide and the RF enclosure. [0031] The method can optionally include routing at least one cable through a waveguide extension; then attaching a cover plate with the waveguide extension to the RF enclosure housing.

[0032] Further features, advantages and details of the present invention will be appreciated by those of ordinary skill in the art from a reading of the figures and the detailed description of the preferred embodiments that follow, such description being merely illustrative of the present invention. Features described with respect with one embodiment can be incorporated with other embodiments although not specifically discussed therewith. That is, it is noted that aspects of the invention described with respect to one embodiment, may be incorporated in a different embodiment although not specifically described relative thereto. That is, all embodiments and/or features of any embodiment can be combined in any way and/or combination. Applicant reserves the right to change any originally filed claim or file any new claim

accordingly, including the right to be able to amend any originally filed claim to depend from and/or incorporate any feature of any other claim although not originally claimed in that manner. The foregoing and other aspects of the present invention are explained in detail in the specification set forth below.

Brief Description of the Drawings

[0033] Figure 1A is a schematic illustration of an MRI suite with control room components connected to Scanner room components using a shielded RF enclosure on a control room side attached to a waveguide in a wall between the rooms according to embodiments of the present invention.

[0034] Figure IB is a schematic illustration of the RF enclosure shown in

Figure 1 A showing DC filters and lead connections according to embodiments of the present invention,

[0035] Figure 2A is a schematic illustration of an MRI suite with control room components connected to Scanner room components using a shielded RF enclosure on a Scanner room side attached to a waveguide in a wall between the rooms according to embodiments of the present invention.

[0036] Figure 2B is a schematic illustration of the RF enclosure shown in

Figure 2A showing DC filters and lead connections according to embodiments of the present invention. [0037] Figure 3A is a side view of an RF enclosure attached to waveguide components (typically associated with a pre-existing (electrically) grounded portal) at an installation site according to embodiments of the present invention.

[0038] Figure 3B is an end view of the RF enclosure shown in Figure 3A (at the smaller tube end).

[0039] Figure 3C is a section view taken along line 3C-3C of the RF enclosure shown in Figure 3B.

[0040] Figure 3D is a perspective view of the RF enclosure shown in Figure

3A.

[0041] Figure 3E is an end view of the RF enclosure shown in Figure 3A illustrating a camera cable and RF filter connection according to embodiments of the present invention.

[0042] Figure 4 is an enlargement of the upper portion of the box shown in

Figure 1 A illustrating threaded spacers according to some embodiments of the present invention.

[0043] Figures 5A-5D are different views of another embodiment of an RF enclosure having a 90 degree pipe according to embodiments of the present invention.

[0044] Figure 6A and 6B are end and side views of yet another embodiment of an RF enclosure with a slightly larger end pipe and larger radius of curvature to the embodiment shown in Figures 5A-5D according to embodiments of the present invention.

[0045] Figures 7A-7C are different views of yet another embodiment illustrating the RF enclosure with a side outlet pipe according to embodiments of the present invention.

[0046] Figures 8A-8F are views of a compact RF enclosure mounted to the wall in the Scanner room (magnet room) in various stages of assembly according to embodiments of the present invention.

[0047] Figures 8G and 8H are views of an RF enclosure that does not require an extension waveguide according to embodiments of the present invention.

[0048] Figures 9A-9J are views of a compact RF enclosure mounted on a control room side in various stages of assembly according to embodiments of the present invention. [0049] Figures lOA-lOC illustrate different views of an alternate RF enclosure according to embodiments of the present invention.

[0050] Figures 11A-11C illustrate different views of an RF enclosure housing box according to embodiments of the present invention.

[0051] Figures 12A-12E illustrate a portion of the RF enclosure shown in

Figures lOA-lOC according to embodiments of the present invention.

[0052] Figure 13A-13C illustrate the panel side view with secondary waveguide of the assembly shown in Figures lOA-lOC.

[0053] Figures 14A and 14B are digital photographs taken of a bore of a

Scanner (magnet) showing a head coil and various components of the neurosurgical system with leads extending therefrom which are routed through the RF enclosure for operation according to embodiments of the present invention.

[0054] Figures 15A and 15B are digital photographs of components of the system on the control room side with various leads that connect to components in the Scanner room via the RF enclosure according to embodiments of the present invention.

[0055] Figure 16 is a digital photograph of camera cables, a monitor and trackball that form part of the intervention system and connect to components in the control room via the RF enclosure according to embodiments of the present invention.

[0056] Figures 17A and 17B are tables of noise measurements taken while components of the system. Figure 17A is for the RF enclosure mounted on the control room side. Figure 17B is for the RF enclosure mounted on the Scanner room side.

[0057] Figure 18 are noise measurements on images using the in-room

(Scanner side) RF enclosure.

[0058] Figures 19 and 20 are schematic illustrations of an MRI intervention system for neurosurgery with cables guided through a waveguide and a single RF enclosure with integrated RF filters according to embodiments of the present invention.

Detailed Description of Embodiments of the Invention

[0059] The present invention now is described more fully hereinafter with reference to the accompanying drawings, in which some embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0060] Like numbers refer to like elements throughout. In the figures, the thickness of certain lines, layers, components, elements or features may be exaggerated for clarity.

[0061] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

[0062] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the specification and relevant art and should not be interpreted in an idealized or overly formal sense unless expressly so defined herein. Well-known functions or constructions may not be described in detail for brevity and/or clarity.

[0063] It will be understood that when an element is referred to as being "on",

"attached" to, "connected" to, "coupled" with, "contacting", etc., another element, it can be directly on, attached to, connected to, coupled with or contacting the other element or intervening elements may also be present. In contrast, when an element is referred to as being, for example, "directly on", "directly attached" to, "directly connected" to, "directly coupled" with or "directly contacting" another element, there are no intervening elements present. It will also be appreciated by those of skill in the art that references to a structure or feature that is disposed "adjacent" another feature may have portions that overlap or underlie the adjacent feature.

[0064] Spatially relative terms, such as "under", "below", "lower", "over",

"upper" and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, elements described as "under" or "beneath" other elements or features would then be oriented "over" the other elements or features. Thus, the exemplary term "under" can encompass both an orientation of "over" and "under". The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. Similarly, the terms

"upwardly", "downwardly", "vertical", "horizontal" and the like are used herein for the purpose of explanation only unless specifically indicated otherwise,

[0065] The term "lead" means an electrical path created by one or more wires.

The wires are typically insulated wires, particularly where exposed. The term "cable" is used interchangeably with the term lead.

[0066] The term "MRI suite" refers to a structure that includes at least two rooms or chambers separated by an RF shield and magnetic shielding as is well known to those of skill in the art. The term "MRI-compatible" means that a device is safe for use in an MRI environment and/or that a device that can operate as intended in an MRI environment and not introduce artifacts into MRI signal data. As such, if residing within the high-field strength region of the magnetic field of an MRI suite, the MRI-compatible device is typically made of a non-ferromagnetic MRI-compatible material(s) suitable to reside and/or operate in a high magnetic field environment. The term "high magnetic field" refers to magnetic fields above 0.5T, typically between 1.5T to 10T, such as about 3.0T.

[0067] The terms "RF shielded" and "RF shielding" with respect to housings refer to conductive material housings that have a sufficient skin, material thickness and/or configuration that impedes, and typically prevents, stray RF signal associated with MRI Scanners from entering the housing. Radio frequency (RF) shielding reduces electromagnetic fields in space by blocking the propagation of

electromagnetic waves with barriers made of electrically conductive material or magnetic material. The amount of attenuation (reduction) of the electromagnetic wave due to shielding material depends upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic field. [0068] The term "about" means that the specified number can vary from the specified parameter (number or range) typically by +/- 20%, and more typically by +/- 10%.

[0069] Referring now to the figures, Figures 1A and 2A illustrate an RF enclosure 10 that is mounted to a waveguide 20 extending through a wall 110 of an MRI suite. The wall 110 includes a waveguide 115. As a number of waveguides are described herein, for ease of discussion this (pre-existing) waveguide 115 will be described as a portal or channel waveguide 115 (or abbreviated to be referred to as "portal or channel") through which (tubular) waveguide 20 can be inserted and holds the waveguide 20. The portal or channel waveguide 115 can be a pre-existing portal or channel waveguide 115 (e.g., in a conventional penetration panel) that is conductive and electrically grounded as is well known to those of skill in the art. The tubular waveguide 20 can be used with the portal waveguide 115 so that the RF enclosure 10 does not require custom portals or additional holes.

[0070] The RF enclosure 10 has a housing lOh with one side having an aperture 11 (Figures IB, 2B, 8B, 9B) that surrounds and mounts to one end portion of the waveguide 20. The housing lOh can be configured as a compact box-like housing that is self-supported by attachment to the waveguide 20 (or extension therefrom) without requiring other attachment members to the wall. Typically, the waveguide 20 terminates a short distance inside the housing lOh so that there is a gap space between the (second or "extension") waveguide 30 and the waveguide 20 in the RF enclosure housing lOh. The housing lOh is conductive and/or shielded and may comprise a metal or other suitable RF shield (MRI compatible, e.g., non-ferromagnetic) material. In some particular embodiments, the housing lOh can be aluminum, the tubular waveguide 20 can be copper, and screws/couplers and nuts can be brass (or copper or aluminum). However, other non-ferromagnetic conductive materials can be used. For example, the waveguide 20 can comprise one or more conductive materials and the members 43, where used, can comprise a different material or materials. Where more than one member 43 is used, each can be the same or different conductive materials.

[0071] An optional second (tubular) waveguide 30 (which can be called a waveguide extension) can be connected to another wall of the RF enclosure 10. The second wall of the housing can optionally also include an aperture 12 (Figures IB, 2B, 7C, 11C) that receives an optional second waveguide 30. Where used, the second waveguide 30 can be in-line and extend straight out of an outermost or front wall of the RF enclosure 10 as shown in Figure 1A, 2A, but may also be configured to extend from a side wall and/or at a different vertical height from the first waveguide 20 and or extend upward, outward or downward (see, Figures 5 A, 5B, 6 A, 6B, 7A).

[0072] As shown in Figures IB and 2B, the RF enclosure 10 holds a plurality of (DC) RF filters 40 which can be outside the enclosure housing (Figure 1A, IB) or inside the enclosure housing (Figures 2A, 2B). Similarly, the RF enclosure 10 can include at least one (shown as two) camera filters 50 which, where used, may reside outside the RF enclosure housing lOh (Figure 1A, IB) or inside the housing lOh (Figure 2 A, 2B). Connectors 40c, 50c can provide the electrical connections to corresponding leads.

[0073] Figures IB and 2B illustrate that the DC filters 40 can have electrical connections/leads 41 which can use the waveguide 20 for an electrical ground 1g to the electrically grounded waveguide portal 115. Waveguide 20 acts as ground 20g (Figures 2A, 3A) because it is in electrical contact with pre-existing (portal) waveguide 115 which is, in turn, connected to the shielding of the Scanner room 100 which acts as overall ground. The electrical contact 20g can be provided by any suitable configuration including a grounding strap or wire(s), integral rings, fingers and the like on an outer wall of the waveguide 20 and combinations of same.

[0074] Figures 3A and 3B illustrate that a plurality of outwardly extending members 43 can provide the electrical ground connection (which is also known as the RF connection) between the tubular (RF filter or enclosure) waveguide 20 and the portal 115. As shown, the members 43 can be formed as flexible conductive rings 43r, typically comprising copper, that allow easy installation without requiring special tools. As is also shown, the plurality of rings 43r can be four longitudinally spaced apart rings 43r, but lesser or greater numbers of rings and/or other shaped outwardly extending ground members may be used. Where used, the rings 43r may have surround the tubular wall of the waveguide 20 or may be discontinuous, e.g., provided as a set of circumferentially spaced apart partial ring members (not shown),

[0075] The members 43 can be configured as at least semi-flexible finger shaped electrical contacts 43 on the outside of waveguide 20. The members 43 can also help to mechanically hold the waveguide 20 in the center of preexisting (portal) waveguide 115, and these RF contacts 43 can also help electrically connect waveguide 20 to preexisting waveguide 115. Low impedance (e.g., less than about 5 Ohms, typically less than about 1 Ohm), good quality electrical contact can be established between waveguide 20 and portal waveguide 115 by using members 43 at several locations along the length of waveguide 20. However, other electrical and mechanical coupling configurations and members may be used.

[0076] In order to ground (i.e. hold the RF housing or enclosure lOh close to zero potential), a desired low impedance is typically in a range from about 0.5 Ohm to 0.1 Ohm. In the embodiment with the copper ring/fingers 43r, this is achieved by having multiple copper rings/fingers which create multiple paths to the waveguide channel 115 surrounding the inner waveguide tube 20 which holds the filter box. These multiple paths are electrically in parallel thereby effective resistance is substantially reduced. However, other electrical connections and configurations can be used.

[0077] As shown in Figure IB, for the control side RF enclosure lOh, the ground 41g may be connected by connecting a lead 41 to an internal wall of the housing lOh which is in electrical communication with the conductive (e.g., copper) waveguide 20 while the other leads 41 connect to connectors 41c inside the enclosure lOh. As shown in Figure 2B, for the Scanner room enclosure 10, the leads 41 can connect to the DC filters 40 and ground 41g in the scanner room. The ground cable 41 can optionally be provided from the monitor 111 inside the Scanner room 100. Thus, in some embodiments, for either the in-Scanner room 100 or in-control room 105, the respective RF enclosure 10 connection to the ground connector 41gc can be from the lead associated with the monitor 111 in the Scanner room 100.

[0078] As shown in Figure IB, the lead or cable 41 is attached to a connector

41gc in the Scanner room 100, then routed through the waveguide 20 to a releasable or affixed (e.g., permanent) electrical ground connection 41g to the filter box lOh which is in the control room 105 (Figure 1A). As shown in Figure 2B, the ground connector 41gc can be placed directly on the filter box lOh. Thus, the waveguide 20 is used to electrically ground the RF enclosure 10 to the portal or channel waveguide 115.

[0079] Also, the RF (DC) filters 40 and camera filters 50 are shown in the figures extending from the same side of the housing (side-by-side), but other arrangements can be used. Figures 1A and 2A show the filters 40 and filters residing below the waveguide 20 extending from (Figure 1 A) or residing enclosed proximate a lower portion of the housing (Figure 2A). Figure 9C shows the filters 40, 50 residing above the waveguide 20 and Figures 10A, 10B show the filters 40, 50 extending horizontally parallel to and under the waveguide 20 and waveguide 30. In other embodiments, the DC filters 40 may extend in one direction while the camera filters 50 extend in another different direction (e.g., about 90, 180 or 270 degrees offset from the filters 40) or one camera filter 50 and one DC filter 40 can reside above another filter 40 or camera 50(not shown). In yet other embodiments, the filters 40 may be enclosed in the housing lOh while the camera filters 50 reside outside the housing lOh (also not shown).

[0080] As shown in Figures 1 A, IB, 2A and 2B, for example, the waveguide

20 and RF housing lOh can enclose a plurality of different leads 10/, typically between about 3-20, and more typically about 3-6. The leads 10/ can includes at least one light source lead, at least one camera lead, at least two DC filter leads (three with a ground wire) and an optical data cable, BNC cables, and camera power supply (two) and includes connectors for electrical components. Not all of the leads are required to be connected to a respective RF filter 40. Further, some of the leads may be routed through waveguide 20 to the corresponding external component (Figure 7B).

[0081] The below table lists an example of components that may be used with or included in the RF enclosure 10,

Figure imgf000014_0001

[0082] Figures 3E and 4 illustrate that the housing can include one or more spacers 60 or otherwise allow for positional adjustment of RF filters 40 and/or camera filters 50 to allow a respective filter to be moved a distance. Figure 3E shows the spacer may reside between the housing lOh and filter 50 outside the enclosure.

Figure 4 illustrates the spacer 60 can be a spacer with internal threads 60t that cooperate with threaded members of RF filters 40 to allow the positional adjustment of connectors 40c of the filters away from the enclosure lOh.

[0083] Figures 8A-8F illustrate a series of steps that can be used to install the

RF enclosure 10 (Scanner side). Generally stated, a (typically tubular) waveguide 20 with at least one outwardly projecting grounding member 43 (Figure 3A) is slidably inserted into a fixed permanent electrically grounded portal (waveguide) 115. As shown in Figures 8A and 8B, an open front RF enclosure housing lOh is attached to a waveguide 20 using the aperture 11 and a locking bracket 14. The waveguide 20 can be slidably inserted (shown by arrow) into an existing opening/channel in the Scanner room wall (the wall between the control room and the Scanner room). Figure 8D shows the RF housing proximate the Scanner room wall with the waveguide 20 extending into the control room (Figure 8A). Figure 8D illustrates cables 10/ extending through the waveguide 20 and into RF housing lOh. Monitor cables are fed through the waveguide 20 to the control room (upward oriented arrows) and other cables are connected to the camera and DC filters from the control room (downward oriented arrows). Scanner side lengths of monitor cables can be fed through waveguide extension 30 attached to the housing cover 10c (Figures 8E, 8F). The cover 10c is secured to the housing lOh (Figure 8F) and the external cables are connected to the camera via camera filters 50 and DC filters 40 (both inside the enclosure housing lOh). The waveguide 20 may be installed first (placed proximate the enclosure and to route the associated cables), then it can attached to the cover 10c rather than provided pre-attached (not shown).

[0084] Figures 9A-9J illustrate an example of an installation process of an RF enclosure 10 according to some embodiments (control room side). In this

embodiment, a waveguide 20 can be slidably inserted into an opening (typically preexisting opening) in the control room 115. The housing lOh can be placed over the waveguide 20 (typically after the waveguide is inserted in the wall channel). A locking bracket 14 can be used to secure the enclosure to the waveguide 20 (Figure 9C). The second waveguide 30 (e.g., "extension" waveguide) can be attached to the housing lOh (or it may be pre-attached). The monitor cables can be fed through the waveguide 30 and the waveguide 20 into the scanner side (Figure 9D). The ground cable 41g can be connected to the enclosure housing and cables can be fed through the waveguide 20 into the control room side and connect to camera and DC filters (Figure 9E). Cables can be connected to camera filters and DC filters (Figure 9F). A cover 10c is secured to the housing lOh (Figure 9G). Figure 9H shows a top view of the connected enclosure 10 and Figure 91 shows a front view. Figure 9J shows a side view with the enclosure 10 in the control room and the waveguide extending to the scanner room (as shown by arrow).

[0085] It is noted that the waveguides 20, 30 may extend a distance into the housing lOh via openings 11, 12 or be attached to an exterior surface of the housing directly or indirectly proximate the respective opening 11, 12, Also, the waveguide extension 30 may not be needed in some embodiments as shown, for example, in Figure s 8G, 8H.

[0086] Figures 5A-5D are different views of an RF enclosure 10 having a 90 degree pipe according to embodiments of the present invention. Figures 7A-7C illustrate the RF enclosure 10 with a side outlet pipe according to embodiments of the present invention.

[0087] Figure 6A and 6B are end and side views of yet another embodiment of an RF enclosure 10 with a slightly larger extension waveguide pipe 30 and larger radius of curvature (e.g., a greater disgtance from the inner perimeter of the housing, D2 relative to Dl for the embodiment shown in Figures 5A-5D according to embodiments of the present invention.

[0088] Figures 8A-8F are views of a compact RF enclosure 10 mounted to the wall 115 in the Scanner room (magnet room) in various stages of assembly according to embodiments of the present invention. In this embodiment, the camera and DC filters are held inside the housing lOh.

[0089] Figures 8G and 8H are views of an RF enclosure 10 that does not require an extension waveguide (hence any side can form the "access" cover which can be a solid continuous cover with no extension waveguide aperture) according to embodiments of the present invention.

[0090] Figures lOA-lOC illustrate different views of an alternate RF enclosure according to embodiments of the present invention. In this embodiment, the camera and DC filters 50, 40 extend horizontally outward rather than vertically upward.

[0091] Figures 11A-11C illustrate different views of an RF enclosure housing lOh having a compact box shape according to embodiments of the present invention.

[0092] Figures 12A-12E illustrate a portion of the RF enclosure 10 shown in

Figures lOA-lOC according to embodiments of the present invention. [0093] Figure 13A-13C illustrate the panel side view with waveguide of the assembly shown in Figures lOA-lOC.

[0094] Figures 19 and 20 show schematic illustrations of a neurosurgery system 200 such as an MRI-guided interventional surgery system as described in U.S. Patent Application Serial No. 12/236,854, entitled MRI Surgical Systems For Real- Time Visualizations Using MRI Image Data And Predefined Data Of Surgical Tools, the contents of which are hereby incorporated by reference as if recited in full herein. However, the RF enclosures 10 may be used for any suitable cabling requirement of an MRI suite and can be disassembled to work with different cables and systems at different times allowing for greater flexibility in room use and system interfaces and connections. For example, the RF enclosure(s) 10 can be used to guide cables for MRI guided cardiac EP procedures or other cardiac surgical interventions. It is also contemplated that the enclosure 10 can be used to facilitate any other MRI guided surgeries, including for injecting therapeutic treatments to a defined intrabody site, or even just for conventional scanning.

[0095] More than one RF enclosure 10 may be used at any one time for any

MRI suite and each can be control-room side or scanner-side enclosures or both of the different room-side mounted enclosures can be used together concurrently.

[0096] Figures 14A and 14B are digital photographs taken of a bore of a

Scanner (magnet) showing a head coil and various components of the neurosurgical system with leads extending therefrom which are routed through the RF enclosure 10 (with waveguide 20) for operation according to embodiments of the present invention.

[0097] Figures 15A and 15B are digital photographs of components of the system on the control room side 105 with various leads 10/ that connect to

components in the Scanner room via the RF enclosure 10 according to embodiments of the present invention.

[0098] Figure 16 is a digital photograph of camera cables, a monitor and trackball that form part of the intervention system and connect to components in the control room via the RF enclosure 10 according to embodiments of the present invention.

[0099] Figures 17A and 17B are tables of noise measurements taken while components of the system. Figure 17A is for the RF enclosure 10 mounted on the control room side. Figure 17B is for the RF enclosure 10 mounted on the Scanner room side. [00100] Figure 18 are noise measurements on images using the in-room (Scanner side) RF enclosure 10.

[00101] The foregoing is illustrative of the present invention and is not to be construed as limiting thereof. Although a few exemplary embodiments of this invention have been described, those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments without materially departing from the teachings and advantages of this invention. Accordingly, all such modifications are intended to be included within the scope of this invention as defined in the claims. The invention is defined by the following claims, with equivalents of the claims to be included therein.

Claims

THAT WHICH IS CLAIMED IS:
1. An RF enclosure for an MRI suite comprising:
an RF shielded housing configured to mount to a pre-existing waveguide channel in a wall of an MRI suite, the housing having an enclosed interior space; and a first tubular waveguide that extends outwardly from a first wall of the housing, the first tubular waveguide sized and configured to slidably engage and electrically connect to the pre-existing waveguide channel.
2. The RF enclosure of Claim 1, further comprising a tubular waveguide extension that extends outwardly from a second wall of the housing.
3. The RF enclosure of Claim 1, wherein the housing is supported by the first waveguide when the first waveguide snugly attaches to the waveguide channel.
4. The RF enclosure of Claim 1 , wherein the first tubular waveguide includes a plurality of longitudinally spaced apart, radially outwardly extending flexible conductive members that are sized and configured to electrically and mechanically couple to the pre-existing waveguide.
5. The RF enclosure of Claim 4, wherein the outwardly extending flexible members are flexible copper rings that are configured to provide low impedance electrical contact the first tubular waveguide and a wall of the waveguide channel.
6. The RF enclosure of Claim 1, further comprising at least one DC filter held inside or on the housing, and wherein, in operative position, the housing is configured to provide an electrical ground for the at least one DC filter.
7. The RF enclosure of Claim 1, further comprising at least one camera filter held inside or on the housing.
8. The RF enclosure of Claim 1 , and an externally accessible cable connector.
9. The RF enclosure of Claim 1, wherein the first tubular waveguide has an outer diameter of about 2.800 inches.
10. The RF enclosure of Claim 2, wherein the first tubular waveguide has an outer diameter that is greater than an outer diameter of the waveguide extension.
1 1. The RF enclosure of Claim 1 , further comprising plurality of cables that extend through the first tubular waveguide into the housing, and wherein the housing holds at least one RF filter that is connected to at least one of the cables in the enclosure.
12. An MRI suite comprising:
a scanner room;
a control room;
an RF shielded wall having a waveguide channel that extends between the scanner and control rooms; and
an RF enclosure with an outwardly extending tubular waveguide sized and configured to extend through and electrically engage the waveguide channel so that the RF enclosure is supported by the outwardly extending tubular waveguide and the tubular waveguide provides an electrical ground.
13. The MRI suite of Claim 12, wherein the RF enclosure further comprises a waveguide extension that extends outwardly from the RF enclosure in a direction away from the tubular waveguide, and wherein the tubular waveguide has an outer diameter that is greater than an outer diameter of the waveguide extension.
14. The MRI suite of Claim 12, wherein the tubular waveguide includes a plurality of longitudinally spaced apart, radially outwardly extending flexible conductive members that are sized and configured to electrically and mechanically snugly couple to an inner surface of a wall of the waveguide channel.
15. The MRI suite of Claim 14, wherein the outwardly extending flexible members are flexible copper rings that are configured to provide low impedance electrical contact the first tubular waveguide and the waveguide channel.
16. The MRl suite of Claim 12, further comprising at least one DC filter held inside or on the RF enclosure, and wherein, in operative position, the RF enclosure is configured to provide an electrical ground for the at least one DC filter.
17. The MRl suite of Claim 12, further comprising at least one camera filter held inside or on the RF enclosure.
18. The MRl suite of Claim 12, wherein the RF enclosure resides in the scanner room and the tubular waveguide extends toward the control room.
19. The MRl suite of Claim 12, wherein the RF enclosure resides in the control room and the tubular waveguide extends toward the scanner room.
20. The RF enclosure of Claim 1, wherein the tubular waveguide has an outer diameter of about 2.800 inches.
21. A method of mounting an RF enclosure holding a plurality of RF filters using an existing electrically grounded portal in an MRl control room or MRl Scanner room, comprising:
slidably inserting a tubular waveguide into a pre-existing waveguide channel in an RF shielded wall of an MR so that the tubular waveguide snugly resides against an inner surface of the waveguide channel;
attaching an RF enclosure housing to one end portion of the tubular waveguide, before or after the inserting step; and
routing cables through the tubular waveguide and the RF enclosure.
22. The method of Claim 21, further comprising:
routing at least one cable through a waveguide extension; then
attaching a cover plate with the waveguide extension to the RF enclosure housing.
PCT/US2012/037334 2011-05-12 2012-05-10 Rf enclosures configured to cooperate with waveguides in mri suites to provide cable connections between rooms WO2012154961A2 (en)

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