Magnetic resonance angiography using floating table...

G - Physics – 01 – R

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G01R 33/563 (2006.01) G01R 33/28 (2006.01)

Patent

CA 2461451

A 3D projection reconstruction pulse sequence is employed to acquire CEMRA data as the subject is continuously moved through the field of view of the MRI system. The acquired k-spaced data is phase corrected to offset the table motion and the corrected data is used to reconstruct an image over a field of view that far exceeds the size of the MRI system field of view. In one embodiment the image is formed as a set of anatomic subregion images which are concatenated to form a single image and in another embodiment a series of images of each anatomic subregion are produced to depict the dynamic inflow of contrast agent.

L'invention concerne une séquence d'impulsions de reconstruction à projection en trois dimensions qui permet d'acquérir des données d'angiographie par résonance magnétique à rehaussement de contraste (CEMRA), tandis que le sujet est maintenu en mouvement permanent dans le champ de vision du système d'imagerie par résonance magnétique (IRM). On applique une correction de phase aux données acquises en espace de dimension k, afin de compenser le mouvement de table. Les données ainsi corrigées permettent de reconstruire une image sur un champ de vision dont la taille est largement supérieure à celle du champ de vision du système IRM. Selon une variante, l'image prend la forme d'une série d'images de sous-régions anatomiques qu'une concaténation assemble en une image unique, et selon une autre variante, on établit une série d'images de chaque sous-région anatomique pour représenter l'écoulement dynamique d'un agent de contraste.

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