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MR imaging using stack of stars acquisition with intrinsic motion correction

机译:使用具有固有运动校正的恒星捕获堆栈进行MR成像

摘要

The invention relates to a method for MR imaging of an object (10). It is an object of the invention to enable MR imaging using the stack-of-stars or stack-of-spirals acquisition scheme that provides improved image quality in the presence of motion. The method of the invention comprises the steps of: generating MR signals by exposing the object to an imaging sequence comprising RF pulses and switched magnetic field gradients; acquiring signal data in accordance with a stack of stars or stack of spirals - Scheme wherein the MR signals are acquired as radial or spiral k-space profiles from a number of parallel slices arranged at adjacent positions along a slice direction, a central portion (20) of k-space being scanned more densely during acquisition as peripheral sections (21) of k-space; - Reconstructing an MR intermediate image (22-25) from subsampled signal data for each of a number of successive time intervals; - Deriving movement-induced displacements and / or deformations by registering the MR intermediate images (22- 25) with each other and combining the subsampled signal data and reconstructing a final MR image therefrom, where A motion correction is applied according to the derived motion-induced displacements and / or deformations. The invention also relates to an MR device (1) and a computer program for an MR device (1).
机译:本发明涉及一种用于对象(10)的MR成像的方法。发明内容本发明的一个目的是使用星形堆叠或螺旋堆叠采集方案实现MR成像,该方案在运动的情况下提供改进的图像质量。本发明的方法包括以下步骤:通过将物体暴露于包括RF脉冲和切换磁场梯度的成像序列来产生MR信号;根据一堆星形或一堆螺旋线采集信号数据-方案中,MR信号是从沿切片方向在相邻位置处排列的多个平行切片中的径向或螺旋k空间轮廓中部(20 )在采集期间将k空间作为k空间的外围部分(21)进行更密集的扫描; -针对多个连续时间间隔中的每一个,从子采样信号数据重建MR中间图像(22-25); -通过相互记录MR中间图像(22-25)并组合子采样信号数据并从中重建最终的MR图像,得出运动引起的位移和/或变形,其中根据得出的运动进行运动校正-引起的位移和/或变形。本发明还涉及一种MR设备(1)和一种用于MR设备(1)的计算机程序。

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