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Method for generation of temporally high-resolution mr exposures

A magnetic resonance image and magnetic resonance technology, applied in the field of MR photos, can solve the problems of limiting the application of radial imaging technology, complicated steps, time-consuming and the like

Inactive Publication Date: 2008-09-03
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method has many drawbacks: the calculation of the back projection limits the application of the method to the radial shooting technique
The method steps are complex and time-consuming

Method used

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  • Method for generation of temporally high-resolution mr exposures
  • Method for generation of temporally high-resolution mr exposures
  • Method for generation of temporally high-resolution mr exposures

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Embodiment Construction

[0023] Think first figure 1 and figure 2 To describe the method of the present invention in detail. The method starts at step 10. In step 11 the K domain or the raw data space is filled with data using a radial acquisition technique from which a non-constant density of the acquired K domain is obtained. Such as figure 2 As shown, a total of N different underscan raw data were taken. exist figure 2 In the display selected in , each raw data set 20 shows a different trajectory 21 , which means that different projections were recorded for different raw data. exist image 3 In , for example, two-dimensional radially symmetric acquisitions of the K-space with different projections are shown. In this radially symmetric acquisition, a measurement is taken at equal intervals along a projection 21 passing through the center of the K-space, wherein multiple projections 2 1 are used for each raw data set (e.g. image 3 star shape). for figure 2 Different raw data sets 20 us...

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Abstract

The invention relates to a method for generation of MR exposures in an MR system, in which a number of under-sampled MR raw data sets are acquired with non-constant density in k-space. A density compensation is implemented dependent on the geometry of the structure to be depicted. The under-sampled MR raw data sets are translated into a Cartesian coordinate system. Fourier transformation of the translated raw data sets in classical three-dimensional space ensues to generate under-sampled MR images. An averaged MR image is generated on the basis of a number of the under-sampled MR raw data sets. The MR exposures are produced by multiplication of the under-sampled MR images with the averaged MR image.

Description

technical field [0001] The invention relates to a method for producing MR images with high temporal resolution in a magnetic resonance system. The application is used in particular but not exclusively for the production of angiograms by means of magnetic resonance. Background technique [0002] In most MR applications, it is desirable to obtain very high spatial resolution in the acquired MR images without significantly extending the acquisition time. However, if the MR raw data set is taken under the Nyquist condition, it means that the scan rate is twice the limit frequency to be displayed, and thus the acquisition time is automatically extended with the increase of the position resolution, because it must be at K Collect more raw data points in the domain. [0003] In addition to the common MR shooting mechanism, the radially symmetrical shooting technology of the K domain is also used to speed up the raw data shooting in general. [0004] In "Highly Constrained Backpr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/563G01R33/56A61B5/055
CPCG01R33/5635A61B5/7257G01R33/561G01R33/56509A61B5/055G01R33/4824A61B5/02007G01R33/563
Inventor 索尼亚·尼尔斯-瓦利斯平彼得·施米特彼得·斯派尔
Owner SIEMENS AG
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