Patent ID: 7440792
Filing Date: 2008-10-21
Classification: G01R

Abstract:
1. An MR method for generating MR images of an object to be examined located inside an examination volume by means of an MR device and for simultaneously locating an instrument also located inside the examination volume, wherein the instrument is equipped with a locating device, by which location signals can be generated in the environment of the instrument, where MR signals together with the location signals from the examination volume are recorded for the reconstruction of an MR image, while the locating device is simultaneously switched to and fro between various states of operation, and wherein the locating of the instrument takes place in that the image characteristics, caused by the switching processes are analyzed, wherein the recording of the MR signals takes place by successively recording at least first and second incompletely sampled partial data records with incomplete sampling of the local frequency spectrum assigned to the examination volume, each incompletely sampled partial data record including a first locating data subrecord and a second locating data subrecord, where the first and second locating data subrecords are extracted from each of the MR incompletely sampled partial data records, so that each of the locating data subrecords is assigned to one of the states of operation of the locating device and where the locating of the instrument takes place by reconstructing difference images from the first and second locating data subrecords of each of the at least first and second incompletely sampled partial data records wherein by combining the at least first and second incompletely sampled partial data records, a complete MR image data record is generated from which the MR image is reconstructed, such that at least two difference images are generated for each MR image.