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1. 发明公开

EP4336203A1 DE-BLURRING AND WATER/FAT SEPARATION IN MR IMAGING WITH SPIRAL ACQUISITION 审中-公开
公开(公告)号：EP4336203A1
公开(公告)日：2024-03-13
申请号：EP22197025.4
申请日：2022-09-22
申请人： Koninklijke Philips N.V.
发明人： GOPALAKRISHNAN, Karthik , VALVANO, Giuseppe , MENON, Kannan
IPC分类号： G01R33/48 , G01R33/485 , G01R33/561 , G01R33/44
摘要： The invention relates to a method of MR imaging of an object (10) positioned in a main magnetic field within an examination volume of an MR device (1). It is an object of the invention to provide an improved spiral imaging technique delivering good image quality by more accurate deblurring and water/fat separation. The method of the invention comprises the following steps: subjecting the object (10) to an imaging sequence comprising at least one RF excitation pulse and modulated magnetic field gradients for generating MR signals at two or more different echo times; acquiring MR signals along a number of distinct spiral k-space trajectories (31, 32, 33), each spiral k-space trajectory (31, 32, 33) being assigned one of the two or more different echo times, wherein the MR signals are received in parallel via a set of at least two RF coils (11, 12, 13) having different spatial sensitivity profiles within the examination volume; and reconstructing an MR image from the acquired MR signals using a parallel reconstruction algorithm, wherein the MR image reconstruction is performed by solving an inverse problem based on a signal encoding model determined by the spatial sensitivity profiles of the RF coils (11, 12, 13), the k-space sampling defined by the spiral k-space trajectories (31, 32, 33), and prior known echo time-dependent phase offsets attributed to the MR signals, which at least includes phase offsets caused by chemical shift and phase offsets caused by spatial inhomogeneity of the main magnetic field. Moreover, the invention relates to an MR device (1) and to a computer program for an MR device (1).

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