초록 ▼

The invention relates to an MR imaging method in which a plurality of sequences, each of which comprises at least one RF pulse and at least one magnetic gradient field, act on an examination zone and in which at least one MR image is reconstructed from the MR signals thus acquired, and also relates

The invention relates to an MR imaging method in which a plurality of sequences, each of which comprises at least one RF pulse and at least one magnetic gradient field, act on an examination zone and in which at least one MR image is reconstructed from the MR signals thus acquired, and also relates to an apparatus for carrying out this method. Optimization can be achieved by subjecting the MR image to an analysis and by adjusting the variation in time of the RF pulses and/or the magnetic gradient field for the subsequent sequences in dependence on the analysis result. In particular, for positioning an object with suitable MR contrast in a body under examination at least one MR survey image of the body is formed prior to the introduction of the object. Then, after introduction of the object into the body, MR images of a small target region around and in front of the object are continuously formed and combined with the MR survey image for display purposes. The MR images of the target area are automatically analyzed to determine the location of the target region for the next MR image.

대표청구항 ▼

[ I claim:] [1.] A MR imaging method comprising: generating a plurality of sequences, each comprising one or more RF pulses and one or more magnetic gradient fields, which act on an examination zone to produce MR signals from which successive MR images can be constructed showing, over time, a region

[ I claim:] [1.] A MR imaging method comprising: generating a plurality of sequences, each comprising one or more RF pulses and one or more magnetic gradient fields, which act on an examination zone to produce MR signals from which successive MR images can be constructed showing, over time, a region of a body including a moveable part; receiving the MR signals produced; reconstructing successive MR images from the MR signals received; automatically successively analyzing a plurality of the reconstructed MR images to determine the position of the moveable part in each current MR image being analyzed; and after each determination of position of the moveable part in a current MR image being analyzed, automatically adjusting a variation in time of at least one of the RF pulses and magnetic gradient fields for subsequent sequences in dependence on the determined position for producing the MR signals from which the next MR image of the successive MR images will be reconstructed.