Geometric distortion in clinical MRI systems - Part II: correction using a 3D phantom

被引:58
作者
Wang, D [1 ]
Strugnell, W
Cowin, G
Doddrell, DM
Slaughter, R
机构
[1] Univ Queensland, Ctr Magnet Resonance, St Lucia, Qld 4072, Australia
[2] Prince Charles Hosp, Cardiovasc MRI Res Ctr, Brisbane, Qld 4032, Australia
关键词
geometric distortion; full restoration; piecewise interpolation; MRI; 3D phantom;
D O I
10.1016/j.mri.2004.08.014
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
In this paper, we present the correction of the geometric distortion measured in the clinical magnetic resonance imaging (MRI) systems reported in the preceding paper (Part 1) using a 3D method based on the phantom-mapped geometric distortion data. This method allows the correction to be made on phantom images acquired without or with the vendor correction applied. With the vendor's 2D correction applied, the method corrects for both the "residual" geometric distortion still present in the plane in which the correction method was applied (the axial plane) and the uncorrected geometric distortion along the axis non-nal to the plane. The evaluation of the effectiveness of the correction using this new method was carried out through analyzing the residual geometric distortion in the corrected phantom images. The results show that the new method can restore the distorted images in 3D nearly to perfection. For all the MRI systems investigated, the mean absolute deviations in the positions of the control points (along x-, y- and z-axes) measured on the corrected phantom images were all less than 0.2 mm. The maximum absolute deviations were all below similar to0.8 mm. As expected, the correction of the phantom images acquired with the vendor's correction applied in the axial plane performed equally well. Both the geometric distortion still present in the axial plane after applying the vendor's correction and the uncorrected distortion along the z-axis have all been "restored." (C) 2004 Elsevier Inc. All rights reserved.
引用
收藏
页码:1223 / 1232
页数:10
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