Parallel magnetic resonance imaging: characterization and comparison

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Title: Parallel magnetic resonance imaging: characterization and comparison
Author: Rane, Swati Dnyandeo
Abstract: Magnetic Resonance Imaging (MRI ) is now increasingly being used for fast imaging applications such as real -time cardiac imaging , functional brain imaging , contrast enhanced MRI , etc . Imaging speed in MRI is mainly limited by different imaging parameters selected by the pulse sequences , the subject being imaged and the RF hardware system in operation . New pulse sequences have been developed in order to decrease the imaging time by a faster k -space scan . However , they may not be fast enough to facilitate imaging in real time . Parallel MRI (pMRI ) , a technique initially used for improving image SNR , has emerged as an effective complementary approach to reduce image scan -time . Five methods , viz . , SENSE [Pruesmann , 1999] , PILS [Griswold , 2000] , SMASH [Sodickson , 1997] , GRAPPA [Griswold , 2002] and SPACE RIP [Kyriakos , 2000] ; developed in the past decade have been studied , simulated and compared in this research . Because of the dependence of the parallel imaging methods on numerous factors such as receiver coil configuration , k -space subsampling factor , k -space coverage in the imaging environment , there is a critical need to find the method giving the best results under certain imaging conditions . The tools developed in this research help the selection of the optimal method for parallel imaging depending on a particular imaging environment and scanning parameters . Simulations on real MR phased -array data show that SENSE and GRAPPA provide better image reconstructions when compared to the remaining techniques .
URI: http : / /hdl .handle .net /1969 .1 /2578
Date: 2005-11-01

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Parallel magnetic resonance imaging: characterization and comparison. Available electronically from http : / /hdl .handle .net /1969 .1 /2578 .

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