US 2012/0056621 A1 · Method For Imaging A Portion Of An Examination Object In A Magnetic Resonance Scanner

Abstract

A method is disclosed for imaging a portion of an examination object in a magnetic resonance scanner. The portion is arranged at the edge of a field of view of the magnetic resonance scanner. During at least one embodiment of the method, a gradient field is produced such that a nonlinearity in the gradient field and a B0-field inhomogeneity cancel at a predetermined point at the edge of the field of view. Magnetic resonance data, which contains the predetermined point at the edge of the field of view, is acquired with the aid of the gradient field. An image of the portion of the examination object at the predetermined point is determined from the magnetic resonance data.

Claims23

Dependent claims

A method for imaging a portion of an examination object in a magnetic resonance scanner, wherein the portion is arranged at an edge of a field of view of the magnetic resonance scanner, the method comprising:

generating a gradient field such that a distortion caused by a nonlinearity in the gradient field and a distortion caused by a B0-field inhomogeneity cancel at a point at the edge of the field of view;
acquiring magnetic resonance data, which contains the point at the edge of the field of view, by way of the gradient field;
and
determining an image of the portion of the examination object at the point at the edge of the field of view from the magnetic resonance data.

1 more element

A magnetic resonance scanner, comprising:

a basic field magnet;
a gradient field system;
a radiofrequency antenna;
and
a control apparatus to actuate the gradient field system and the radiofrequency antenna, to receive measurement signals recorded by the radiofrequency antenna, to evaluate the measurement signals, and to produce magnetic resonance images, and wherein the magnetic resonance scanner is embodied
to generate a gradient field such that a nonlinearity in the gradient field and a B0-field inhomogeneity cancel at a point at the edge of the field of view,
to acquire magnetic resonance data, which contains the point at the edge of the field of view by way of the gradient field, and
to determine an image of a portion of an examination object from the magnetic resonance data at the point at the edge of the field of view.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application

13/226,022Filed 6 Sep 2011

Priority

DE 10 2010 044 520.77 Sep 2010

Published

8 Mar 2012

Term ends

Not estimatedThe source records don’t support an estimate.

Classification5 codes

G01R 33/56563
Correction of image distortions, e.g. due to magnetic field inhomogeneities: caused by a distortion of the main magnetic field B0, e.g. temporal…
G01R 33/445
Using nuclear magnetic resonance [NMR]: mR involving a non-standard magnetic field B0, e.g. of low magnitude as in the earth's magnetic field or…
G01R 33/56572
Correction of image distortions, e.g. due to magnetic field inhomogeneities: caused by a distortion of a gradient magnetic field, e.g.…
G01R 33/481
Multimodal MR, e.g. MR combined with positron emission tomography [PET], MR combined with ultrasound or MR combined with computed tomography [CT]:…

Method For Imaging A Portion Of An Examination Object In A Magnetic Resonance Scanner

Life of this patent

Method For Imaging A Portion Of An Examination Object In A Magnetic Resonance Scanner

Life of this patent

Abstract

Claims23