Method and device for reconstructing a sequence of mr images using a regularized nonlinear inverse reconstruction process

An image sequence and image technology, applied in the field of MR imaging, can solve difficult and time-consuming problems, and achieve the effects of high image quality, shortened duration, and significant motion robustness

Active Publication Date: 2013-04-10
MAX PLANCK GESELLSCHAFT ZUR FOERDERUNG DER WISSENSCHAFTEN EV
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However, efficiently implementing interpolation algo

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  • Method and device for reconstructing a sequence of mr images using a regularized nonlinear inverse reconstruction process
  • Method and device for reconstructing a sequence of mr images using a regularized nonlinear inverse reconstruction process
  • Method and device for reconstructing a sequence of mr images using a regularized nonlinear inverse reconstruction process

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[0042]Preferred embodiments of the present invention are described below with particular reference to the design of K-space trajectories, the mathematical formulation of canonical nonlinear inversion reconstruction and examples of images obtained using the method of the present invention. Details of the MRI equipment, the construction of the gradient echo sequence and its adjustment for the specific object to be imaged, the implementation of the mathematical formula values ​​using available software tools, and optionally further image processing steps, as long as they are not known from conventional MRI techniques Let me repeat. Furthermore, in the following, exemplary reference is made to parallel MR imaging, where the image raw data comprises MRI signals received by multiple radio frequency receiver coils. It should be emphasized that the application of the invention is not limited to parallel MR imaging, and even a single receiver coil can be used.

[0043] figure 1 The ...

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Abstract

A method for reconstructing a sequence of magnetic resonance (MR) images of an object under investigation, comprises the steps of (a) providing a series of sets of image raw data including an image content of the MR images to be reconstructed, said image raw data being collected with the use of at least one radiofrequency receiver coil of a magnetic resonance imaging (MRI) device, wherein each set of image raw data includes a plurality of data sampies being generated with a gradient-echo sequence, in particular a FLASH sequence, that spatially encodes an MRl signal received with the at least one radiofrequency receiver coil using a non-Cartesian k-space trajectory, each set of image raw data comprises a set of homogeneously distributed lines in k-space with equivalent spatial frequency content,; the lines of each set of image raw data cross the center of k-space and cover a continuous range of spatial frequencies, and the positions of the lines of each set of image raw data differ in successive sets of image raw data, and (b) subjecting the sets of image raw data to a regularized nonlinear inverse reconstruction process to provide the sequence of MR images, wherein each of the MR images is created by a simultaneous estimation of a sensitivity of the at least one receiver coil and the image content and in dependency on a difference between a current estimation of the sensitivity of the at least one receiver coil and the image content and a preceding estimation of the sensitivity of the at least one receiver coil and the image content.

Description

technical field [0001] The invention relates to a method for reconstruction of a magnetic resonance (MR) image sequence. Furthermore, the invention relates to a Magnetic Resonance Imaging (MRI) apparatus configured to implement the method. The application of the invention covers the field of MR imaging, in particular the field of medical MR imaging (eg cardiovascular imaging) or non-medical research in natural sciences (eg study of workpieces or dynamic processes). Background technique [0002] Since the conception of Magnetic Resonance Imaging (MRI) in 1973, the main driving force behind the further technical, scientific and clinical development of MRI has been the search for speed. Historically, it took more than a decade to emerge due to the generation of a sufficiently strong steady-state MRI signal Fast Small Angle Excitation (FLASH) MRI technology (DE 3504734 or US 4707658A), which shortens the acquisition time of cross-sectional images to about one second and allo...

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Application Information

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IPC IPC(8): G01R33/561
CPCG01R33/246G01R33/4824G01R33/5608G01R33/5611G01R33/56308
Inventor J·弗拉姆M·于克尔张硕
Owner MAX PLANCK GESELLSCHAFT ZUR FOERDERUNG DER WISSENSCHAFTEN EV
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