Three-dimensional imaging method and system for alleviating magnetic susceptibility artifact
A technology of three-dimensional imaging and magnetic susceptibility, which is applied in the fields of measuring magnetic variables, medical science, and measuring devices, can solve the problems of long scanning time, poor imaging efficiency, and no three-dimensional imaging to reduce magnetic susceptibility artifacts, etc., to improve imaging efficiency, Effect of reducing susceptibility artifacts
Inactive Publication Date: 2012-05-30
SIEMENS AG
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0012] Practice has proved that this method can better overcome the problem of image signal inhomogeneity caused by inhomogeneous magnetic susceptibility, but finding the shimming gradient of the final imaging requires a cumbersome manual search process, and the scanning time is longer, that is, the imaging efficiency is poor
[0013] To sum up, the current methods for mitigating susceptibility artifacts in 2D imaging cannot achieve good results based on high imaging efficiency, and there is no method for mitigating susceptibility artifacts specifically for 3D imaging.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0046] In order to make the objects and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, and these descriptions are non-limiting.
[0047] Firstly, the method of the present invention for alleviating susceptibility artifacts is introduced.
[0048] In the three-dimensional imaging method for alleviating magnetic susceptibility artifacts of the present invention, the number of three-dimensional sub-images required to synthesize a three-dimensional image and the number of times required to use radio frequency pulses to excite the nucleus of the subject to be reconstructed for each three-dimensional image are determined; for each A three-dimensional sub-image, using radio frequency pulses to excite the nucleus for a certain number of times, and applying a readout gradient to receive echo signals, reconstructing the three-dimensional sub-image according to all ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses an imaging method for alleviating magnetic susceptibility artifact, which comprises the following steps: determining the number of three-dimensional sub-images required by synthesizing a three-dimensional image, and the frequency of using a radio-frequency pulse excited checked body required by reestablishing each three-dimensional sub-image; for each three-dimensional sub-image, using the frequency of using the radio-frequency pulse excited checked body, applying read-out gradient to receive echoed signals, and then reestablishing the three-dimensional sub-image according to all the echoed signals of the three-dimensional sub-image; and using all reestablished three-dimensional sub-images to synthesize the three-dimensional image. The invention also discloses a system for alleviating the magnetic susceptibility artifact. The method and the system can obviously alleviate the magnetic susceptibility artifact in three-dimensional magnetic resonance imaging based on high imaging efficiency.
Description
technical field [0001] The present invention relates to Magnetic Resonance Imaging (MRI, Magnetic Resonance Imaging) technology, in particular to a three-dimensional imaging method and system for alleviating magnetic susceptibility artifacts. Background technique [0002] Magnetic resonance imaging is a technique that uses the phenomenon of magnetic resonance to perform imaging. The principle of magnetic resonance phenomenon mainly includes: atomic nuclei containing a single number of protons, such as hydrogen nuclei widely present in the human body, the protons have spin motion, just like a small magnet, and the spin axes of these small magnets have no certain rules. In the external magnetic field, the spin axes of these small magnets will be rearranged according to the magnetic field lines of the external magnetic field. In this state, the radio frequency (RF, Radio Frequency) pulse of a specific frequency is used for excitation, and these small magnets absorb a certain am...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & AuthorityPatents(China)
IPC IPC(8): G01R33/565A61B5/055
Inventor翁得河张强
OwnerSIEMENS AG