초록 ▼

An MR system for interventional procedures, includes an MR device and an invasive device. The MR device is arranged to acquire images of a part of an object. A part of the invasive device can be imaged in an MR image by providing a coil or a conductor loop which has two non-magnetic conductors which

An MR system for interventional procedures, includes an MR device and an invasive device. The MR device is arranged to acquire images of a part of an object. A part of the invasive device can be imaged in an MR image by providing a coil or a conductor loop which has two non-magnetic conductors which are situated at some distance from one another underneath the surface of the invasive device. A reduction of artefacts due to the movement of a patient or the invasive device can be obtained by sampling an MR signal, whereby an auxiliary magnetic field is periodically applied during the time in which the plurality of lines in k-space are scanned.

대표청구항 ▼

[ We claim:] [1.] An MR system for interventional procedures, comprising:a magnet for generating a steady magnetic field in an object,means for generating temporary magnetic fields in the object, the temporary magnetic fields having gradients in orthogonal directions,means for generating RF pulses i

[ We claim:] [1.] An MR system for interventional procedures, comprising:a magnet for generating a steady magnetic field in an object,means for generating temporary magnetic fields in the object, the temporary magnetic fields having gradients in orthogonal directions,means for generating RF pulses in the object,means for measuring MR signals from the object,an invasive device for introduction into the object, and which comprises means for generating an auxiliary magnetic field andcontrol means for generating signals controlling the means for generating temporary magnetic fields, the means for generating RF pulses, and the means for generating the auxiliary magnetic field, so that the measurement of MR signals for determining an image of an object comprises scanning k-space along a plurality of lines, with the auxiliary magnetic field being periodically applied a plurality of times during the scanning of k-space, andprocessing means both for processing measured MR signals to determine an image of the object, and also for processing changes in the measured MR signals induced by the periodically applied auxiliary magnetic field to determine a position of the invasive device within the image of object.