Invasive device for use in a magnetic resonance imaging apparatus
First Claim
1. An invasive device to be introduced into an object being imaged with a magnetic resonance imaging apparatus comprising:
- an elongate envelope which has a distal end and a proximal end,one or more RF coils which are arranged in the envelope,an electric connection for coupling the one or more RF coils to a control unit, anda hollow carrier which is in the envelope and which has a distal end and a proximal end, the electric connection extending through said hollow carrier, said hollow carrier comprising an electrically conductive shield which extends over a distance from the distal end to the proximal end of the hollow carrier, and which has an electric resistance over said distance which is substantially higher than the electric resistance of the electric connection over the same distance.
1 Assignment
0 Petitions
Accused Products
Abstract
An invasive device which is intended to cooperate with a magnetic resonance imaging apparatus is provided with an RF coil which is situated near a distal part of the invasive device. The RF coil is used so as to visualize the position of a distal end of the invasive device, introduced into an object, in an image of the object. Current induced by an RF field to be generated by the magnetic resonance imaging apparatus develops heat in the electric connection between the RF coil and a control unit, which may be annoying to a patient. In order to counteract the development of heat in the invasive device, the invasive device is provided with a hollow carrier. The electric connection extends through said carrier which is provided with an electrically conductive shield with an additional resistance.
-
Citations
20 Claims
-
1. An invasive device to be introduced into an object being imaged with a magnetic resonance imaging apparatus comprising:
-
an elongate envelope which has a distal end and a proximal end, one or more RF coils which are arranged in the envelope, an electric connection for coupling the one or more RF coils to a control unit, and a hollow carrier which is in the envelope and which has a distal end and a proximal end, the electric connection extending through said hollow carrier, said hollow carrier comprising an electrically conductive shield which extends over a distance from the distal end to the proximal end of the hollow carrier, and which has an electric resistance over said distance which is substantially higher than the electric resistance of the electric connection over the same distance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A magnetic resonance apparatus for imaging an object with an introduced invasive device comprising:
-
a first magnet system for generating a static magnetic field in the object, a plurality of gradient coils for generating gradient magnetic fields in the object, one of more RF coils for transmitting RF pulses to the object and for receiving RF signals from the object, and a control unit for controlling the gradient magnetic fields and the RF pulses in order to generate magnetic resonance imaging signals, and an invasive device comprising an elongate envelope which is adapted to be introduced into the object, one or more receiving coils which are arranged in the envelope and which are for receiving the RF pulses, an electric connection for coupling the one or more receiving coils to an invasive-device control unit, and a hollow carrier which is in the envelope and which has a distal end and a proximal end, the electric connection extending through said hollow carrier, said hollow carrier comprising an electrically conductive shield which extends over a distance from the distal end to the proximal end of the hollow carrier, and which has an electric resistance over said distance which is substantially higher than the electric resistance of the electric connection over the same distance. - View Dependent Claims (15, 16, 17, 18, 19, 20)
-
Specification