METHOD OF AND DEVICE FOR IMAGING AN OBJECT BY MEANS OF MAGNETIC RESONANCE
The invention relates to a magnetic resonance (MR) imaging method for forming images of a part of a human or animal body which is arranged in a steady magnetic field, an MR image being made of the part which is directed transversely of a major axis of an ellipsoid which approximates the part. The me...
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Zusammenfassung: | The invention relates to a magnetic resonance (MR) imaging method for forming images of a part of a human or animal body which is arranged in a steady magnetic field, an MR image being made of the part which is directed transversely of a major axis of an ellipsoid which approximates the part. The method is used, for example for functional examination of a heart of a human body during which MR images are made of the left ventricle of the heart. Because the heart in every body may be oriented differently relative to a feet-to-head axis and relative to an axis transversely of the feet-to-head axis, the major axis of the ellipsoid should be determined so as to enable an MR image to be formed of an imaging plane which extends transversely of the major axis and contains a minor axis of the ellipsoid. To this end, two MR images are made of a first imaging plane and a second imaging plane of the heart, respectively, the first imaging plane and the second imaging plane being chosen in such a manner that they extend transversely of the feet-to-head axis of the body. Subsequently, a first reference and a second reference are determined in the first and the second MR image, respectively, said references being characterized by one and the same property in the MR images. The estimate of the major axis of the ellipsoid is then determined by a connecting line through two points which correspond to the first reference and the second reference, respectively.
L'invention concerne un procédé d'imagerie par résonance magnétique (MR) servant à former des images d'une partie d'un corps humain ou animal qui est placée dans un champ magnétique fixe, une image MR étant obtenue de la partie qui est dirigée transversalement par rapport un axe principal d'une ellipsoïde proche de la partie. Le procédé est utilisé, par exemple, pour l'examen fonctionnel d'un coeur humain au cours duquel on prend des images MR du ventricule gauche du coeur. Le coeur pouvant être orienté différemment dans chaque corps par rapport à un axe pieds-tête, et par rapport à un axe transversal de cet axe pieds-tête, l'axe principal de l'ellipsoïde doit être déterminé de manière à permettre de former une image MR d'un plan d'imagerie qui s'étend transversalement par rapport à l'axe principal et contient un axe mineur de l'ellipsoïde. A cet effet, on prend deux images RM d'un premier plan d'imagerie et d'un deuxième plan d'imagerie du coeur, respectivement, le premier plan d'imagerie et le deuxième plan d'imagerie |
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