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基于迭代的PROPELLERMRI重建算法

DOI: 10.11834/jig.20110211

Keywords: 磁共振,卷积网格,PROPELLER,迭代方法

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Abstract:

PROPELLER是磁共振成像中能有效消除运动伪影的一种新的采集技术。对于PROPELLER的重建,传统的卷积网格方法由于需要优化大量参数和采样密度补偿过程,重建图像的质量很难得到保证。本文提出使用迭代重建的方法进行PROPLLER的重建,通过加权预条件共轭梯度算法,迭代最小化代价函数,从而得到重建图像。为了提高速度,在每步迭代中,使用NUFFT计算矩阵-向量乘法。通过仿真数据和实际扫描数据比较验证,迭代算法相比卷积网格化方法提高了重建图像信噪比,消除了振铃伪影,并提高了图像的均匀性。

References

[1]  Van de Walle R. ;Myers KJ. ;Altbach MI. ;Desplanques B. Gmitro AF. ;Cornelis J. ;Lemahieu I. ;Barrett HH.,Reconstruction of MR images from data acquired on a general nonregular grid by pseudoinverse calculation,IEEE Transactions on Medical Imaging?,2000, 19(12).
[2]  Haacke E M;Brown R W;Thompson M R,MRI:Physical Principles and Sequence Design,New York:John Wiley and Sons,Inc,1999.
[3]  Pipe J G;Menon P,Sampling density compensation in MRI:Rationale and an iterative numerical solution,Magnetic Resonance in Medicine,1999(01).
[4]  Sedarat H. ;Nishimura DG.,On the optimality of the gridding reconstruction algorithm,IEEE Transactions on Medical Imaging?,2000, 19(4).
[5]  Jackson, J.I. ;Meyer, C.H.,Selection of a convolution function for Fourier inversion using gridding (computerised tomography application),IEEE Transactions on Medical Imaging?,1991, 10(3).
[6]  Plewes DB,Retrospective motion compensation using variable-density spiral trajectories.,Journal of magnetic resonance imaging?,2005, 22(3).
[7]  ,Nonuniform Fast Fourier Transforms Using Min-Max Interpolation,IEEE Transactions on Signal Processing?,2003, 51(2).
[8]  Sutton, B.P. ;Noll, D.C. ;Fessler, J.A.,Fast, iterative image reconstruction for MRI in the presence of field inhomogeneities,IEEE Transactions on Medical Imaging?,2003, 22(2).
[9]  Rasche, V. ;Sinkus, R. ;Boernert, P. ;Eggers, H. ;Proksa, R.,Resampling of data between arbitrary grids using convolution interpolation,IEEE Transactions on Medical Imaging?,1999, 18(5).
[10]  Wajer F T A W;Lethmate R;van Osch J,Interpolation from arbitrary to cartesian sample positions:Gridding,Veldhoven,the Netherlands:IEEE Benelux,2000.
[11]  Pipe JG,Motion correction with PROPELLER MRI:application to head motion and free-breathing cardiac imaging,Magnetic Resonance in Medicine? ,1999, 42.
[12]  Dold C;Zaitsev M;Speck O,Prospective head motion compensation for MRI by updating the gradients and radio,San Jose.CA,USA:Lecture Notes on Computer Science,2005.

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