A complete distortion correction for MR images: I. Gradient warp correction

被引:186
作者
Doran, SJ [1 ]
Charles-Edwards, L
Reinsberg, SA
Leach, MO
机构
[1] Univ Surrey, Dept Phys, Guildford GU2 7XH, Surrey, England
[2] Inst Canc Res, Clin Magnet Resonance Res Grp, Sutton SM2 5PT, Surrey, England
关键词
D O I
10.1088/0031-9155/50/7/001
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
MR images are known to be distorted because of both gradient nonlinearity and imperfections in the B-0 field, the latter caused either by an imperfect shim or sample-induced distortions. This paper describes in detail a method for correcting the gradient warp distortion, based on a direct field mapping using a custom-built phantom with three orthogonal grids of fluid-filled rods. The key advance of the current work over previous contributions is the large volume of the mapping phantom and the large distortions (> 25 mm) corrected, making the method suitable for use with large field of view, extra-cranial images. Experimental measurements on the Siemens AS25 gradient set, as installed on a Siemens Vision scanner, are compared with a theoretical description of the gradient set, based on the manufacturer's spherical harmonic coefficients. It was found that over a volume of 320 x 200 x 340 mm(3) distortions can be successfully mapped to within the voxel resolution of the raw imaging data, whilst outside this volume, correction is still good but some systematic errors are present. The phenomenon of through-plane distortion (also known as 'slice warp') is examined in detail, and the perturbation it causes to the measurements is quantified and corrected. At the very edges of the region of support provided by the phantom, through-plane distortion is extreme and only partially corrected by the present method. Solutions to this problem are discussed. Both phantom and patient data demonstrate the efficacy of the gradient warp correction.
引用
收藏
页码:1343 / 1361
页数:19
相关论文
共 22 条
[1]  
ARFKEN G, 1985, MATH METHODS PHYSICI, P669
[2]   ANALYSIS OF MACHINE-DEPENDENT AND OBJECT-INDUCED GEOMETRIC DISTORTION IN 2DFT MR IMAGING [J].
BAKKER, CJG ;
MOERLAND, MA ;
BHAGWANDIEN, R ;
BEERSMA, R .
MAGNETIC RESONANCE IMAGING, 1992, 10 (04) :597-608
[3]   Evaluation of the spatial accuracy of magnetic resonance imaging-based stereotactic target localization for gamma knife radiosurgery of functional disorders [J].
Bednarz, G ;
Downes, B ;
Corn, BW ;
Curran, WJ ;
Goldman, HW .
NEUROSURGERY, 1999, 45 (05) :1156-1161
[4]   Accuracy of MRI-guided stereotactic thalamic functional neurosurgery [J].
Bourgeois, G ;
Magnin, M ;
Morel, A ;
Sartoretti, S ;
Huisman, T ;
Tuncdogan, E ;
Meier, D ;
Jeanmonod, D .
NEURORADIOLOGY, 1999, 41 (09) :636-645
[5]  
CHANG H, 1990, P SOC PHOTO-OPT INS, V1233, P116
[6]  
DORAN SJ, 2001, P ISMRM 9 ANN M GLAS
[7]   Aspects of MR image distortions in radiotherapy treatment planning [J].
Fransson, A ;
Andreo, P ;
Pötter, R .
STRAHLENTHERAPIE UND ONKOLOGIE, 2001, 177 (02) :59-73
[8]   Use of spherical harmonic deconvolution methods to compensate for nonlinear gradient effects on MRI images [J].
Janke, A ;
Zhao, HW ;
Cowin, GJ ;
Galloway, GJ ;
Doddrell, DM .
MAGNETIC RESONANCE IN MEDICINE, 2004, 52 (01) :115-122
[9]   DIAGNOSTIC-IMAGING AS A MEASURING DEVICE FOR STEREOTAXIC NEUROSURGERY [J].
JONES, AP .
PHYSIOLOGICAL MEASUREMENT, 1993, 14 (02) :91-112
[10]   Radiotherapy treatment planning of prostate cancer using magnetic resonance imaging alone [J].
Lee, YK ;
Bollet, M ;
Charles-Edwards, G ;
Flower, MA ;
Leach, MO ;
McNair, H ;
Moore, E ;
Rowbottom, C ;
Webb, S .
RADIOTHERAPY AND ONCOLOGY, 2003, 66 (02) :203-216