MRI-system and catheter for interventional procedures
First Claim
1. An MR system for interventional procedures, comprising an MR imaging device which is arranged to acquire images of a part of an object, said MR imaging device including a magnet for generating a steady magnetic field, and means for generating temporary magnetic gradient fields, and an elongated interventional instrument (i) which includes a conductor loop with two non-magnetic conductors being spaced apart along and extending along substantially the length of an operative portion of the instrument and (ii) which is arranged for application of a direct current through the conductor loop for generating a direct current through the conductor loop for generating a first additional magnetic field in the vicinity of and along substantially the length of the operative portion of the instrument, during acquisition of an MR image.
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Accused Products
Abstract
An MR system for interventional procedures, includes an MR imaging device and an interventional instrument, for example a catheter. The MR device is arranged to acquire images of a part of an object. The entire catheter can be imaged in an MR image by providing a conductor loop which comprises two non-magnetic conductors which are situated at some distance from one another underneath the surface of the catheter, and extend along substantially the entire length of the catheter. Furthermore, the catheter may be provided with a conductor loop and a coil in a location on the catheter. By separate adjustment of the current flowing through the conductor loop and the coil, it is possible to image the location on the catheter with a contrast which deviates from that of the remainder of the catheter.
359 Citations
21 Claims
- 1. An MR system for interventional procedures, comprising an MR imaging device which is arranged to acquire images of a part of an object, said MR imaging device including a magnet for generating a steady magnetic field, and means for generating temporary magnetic gradient fields, and an elongated interventional instrument (i) which includes a conductor loop with two non-magnetic conductors being spaced apart along and extending along substantially the length of an operative portion of the instrument and (ii) which is arranged for application of a direct current through the conductor loop for generating a direct current through the conductor loop for generating a first additional magnetic field in the vicinity of and along substantially the length of the operative portion of the instrument, during acquisition of an MR image.
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15. An interventional MR method comprising:
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a) generating MR signals in order to determine temporally successive first and second MR images, b) generating at least one additional magnetic field in the vicinity of and along substantially the length of the operative portion of the instrument, during the generating of MR signals for determining the second MR image by applying a direct current through a conductor loop in an interventional instrument, the conductor loop comprising two non-magnetic conductors being spaced apart along and extending along substantially the length of c) receiving the MR signals generated, d) processing the MR signals received so as to form the first and second MR images, and e) determining a position of the instrument within the object on the basis of the first and second MR images. - View Dependent Claims (16)
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- 17. An instrument for penetrating a body in cooperation with examination of the body with an MR device, said instrument comprising a conductor loop with two non-magnetic conductors being spaced apart alone and extending along substantially the length of an operative portion of the instrument for generating a first magnetic field in the vicinity of and along substantially the length of the operative portion of the instrument, in response to direct current in said conductor loop.
Specification