초록 ▼

In a method for the location determination of a positionable object in an examination subject by means of magnetic resonance and apparatus for the implementation of the method a reference image is acquired from at least one slice of the examination subject. The current position of the subject is det

In a method for the location determination of a positionable object in an examination subject by means of magnetic resonance and apparatus for the implementation of the method a reference image is acquired from at least one slice of the examination subject. The current position of the subject is determined by at least one radio-frequency reception coil attached to the object. A slice position in which the reference image is updated is determined on the basis of this current position.

대표청구항 ▼

[ We claim as our invention:] [11.] An apparatus for determining a location of a positionable object in an examination subject by magnetic resonance comprising:a whole body antenna;means for generating magnetic gradient fields;means for acquiring nuclear magnetic resonance signals from the whole bod

[ We claim as our invention:] [11.] An apparatus for determining a location of a positionable object in an examination subject by magnetic resonance comprising:a whole body antenna;means for generating magnetic gradient fields;means for acquiring nuclear magnetic resonance signals from the whole body antenna comprising a reference image of at least one slice of an examination subject disposed in said magnetic gradient fields, and for phase coding said magnetic resonance signals in a first direction with alternating signs and for phase coding said magnetic resonance signals in a second direction with alternating signs;at least one radio-frequency reception coil having a small sensitivity region, attached to an object whose position is to be determined;means for acquiring magnetic resonance signals, in the presence of said magnetic field gradients, from said radio-frequency reception coil while said reference image is acquired, said magnetic resonance signals having a frequency/phase spectrum associated therewith, and for identifying a current position of said object from said frequency/phase spectrum of said magnetic resonance signals;means for defining successive, respective new slice positions dependent on successive current positions of said object and for successively updating said reference image, to obtain an update reference images only by incorporating each new slice position in said respective updated images.