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Communication Module Design and Eddy Current Compensation for a MRI Spectrometer

Author: GuoYaPing
Tutor: ZhouHeQin
School: University of Science and Technology of China
Course: Pattern Recognition and Intelligent Systems
Keywords: Magnetic resonance imaging Spectrometer Communication module design Gradient magnetic field Eddy Segmented iterative
CLC: R197.39
Type: Master's thesis
Year: 2011
Downloads: 42
Quote: 0
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Abstract


Magnetic resonance imaging (Magnetic Resonance Imaging, MRI) is the use of biological hydrogen nuclei in the body under the joint action of the RF pulse and the gradient magnetic resonance signal after the image reconstruction method and imaging technology. Compared with X-ray CT, magnetic resonance imaging with high tissue resolution, spatial resolution, the advantages of multi-parameter imaging, can be in any direction fault and no radiation damage. After 30 years of rapid development, the magnetic resonance imaging has become one of the most advanced, the most widely used tool in the clinical diagnosis. The core control module as the MRI system, the spectrometer (Spectrometer) controls the generation of the timing of the other modules of the imaging system and the RF waveform and the gradient waveform signal, and a signal from the transmitter, receiving and processing operations such coordinated operation. Currently, only a handful of foreign manufacturers for the design and implementation of the spectrometer, but expensive, research data is very confidential domestic product of the magnetic resonance imaging system, the spectrometer is mainly dependent on imports, which resulted in the MRI system production and high maintenance costs, patients do check the high cost. Therefore, the development of the spectrometer system with independent intellectual property rights is important. This thesis, works on the principle of magnetic resonance imaging and spectroscopy of the in-depth study, a new MRI spectrometer system software design. First of all, participate in discussions to determine the the spectrometer hardware system design, determine the the spectrometer hardware system architecture, and describes the function of each hardware module. Next, the workflow for the spectrometer, conduct a functional analysis of software systems and the MRI spectrometer system host computer side software module design, it is matched with the spectrometer hardware system, enabling the user a variety of imaging needs, access to high-quality magnetic resonance images. This paper focus on magnetic resonance imaging sequences and parameters file information data encapsulation, and reliable communication between the host computer and the spectrometer hardware boards. In the imaging process, the presence of the eddy currents affect the quality of the MRI image. Therefore, the eddy current compensation method for magnetic resonance imaging study in order to improve the quality of MRI imaging. First study the mechanism of generation of eddy currents in magnetic resonance imaging, and imaging and an eddy current compensation method based on the sub-iteration MRI imaging. The technical basis of the method is the gradient current pre-enhancement technology, the general gradient current pre enhance thousands of e index calculated in a single cycle, requires the use of a rapid method of calculation. Iterative calculation is commonly used by the eddy current compensation is fast calculation method, but there is the problem of cumulative error amplification. In response to this problem, based on the principle of the iterative calculation, the eddy current compensation method for an improved segmented MRI imaging of the iteration. Experimental results show that this method is effective to improve the accuracy of the gradient pre-enhancing amount of a.

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