MAGNETIC RESONANCE METHOD AND APPARATUS FOR DETERMINING DEFORMATION INFORMATION FROM A CYCLICALLY MOVING EXAMINATION SUBJECT

摘要

In a magnetic resonance method and apparatus for determining an item of deformation information of an examination object that exhibits a cyclical movement within an examination subject, a spatial magnetization pattern is generated in an MR scanner, and MR signals are acquired from the subject during at least two cycles of the cyclical movement, with the spatial magnetization exhibiting differences in a subsequent cycle of the movement compared to an earlier cycle. Segmented subsequent MR images are acquired in a subsequent cycle and the examination object is localized therein. This localization of the examination object is then used to localize the examination object in segmented earlier MR images from the earlier cycle, and the item of deformation information is determined in a spatial direction from the segmented earlier MR images.

主权项

1. A method for determining an item of deformation information from an examination subject that executes a cyclical movement in a magnetic resonance (MR) scanner, comprising:
operating an MR scanner, while an examination subject exhibiting a cyclical movement is situated therein, to generate a spatial magnetization pattern, with spatial magnetization differences, of a magnetization of nuclear spins in the examination subject; operating the MR scanner, during at least two cycles of the cyclical movement that include an earlier cycle and a subsequent cycle that occurs at any time after said earlier cycle, to acquire MR signals from the examination subject, after generating the spatial magnetization pattern, that are dependent on said magnetization of said nuclear spins; providing said MR signals to a computer and, in said computer, reconstructing an earlier MR image of the examination subject from the MR signals acquired during said earlier cycle, and reconstructing a subsequent MR image of the examination subject from the MR signals acquired during said subsequent cycle; said computer, determining a segmented subsequent MR image from said subsequent MR image in which an examination object in the examination subject is localized; in said computer, determining a segmented earlier MR image from said earlier MR image in which the examination object localized in said segmented subsequent MR image is localized; and in said computer, determining, from the segmented earlier image, an item of deformation information that describes formation of the examination object in a spatial direction.