A novel phantom and method for comprehensive 3-dimensional measurement and correction of geometric distortion in magnetic resonance imaging

Wang, Deming, Doddrell, David. M. and Cowin, Gary (2004) A novel phantom and method for comprehensive 3-dimensional measurement and correction of geometric distortion in magnetic resonance imaging. Magnetic Resonance Imaging, 22 4: 529-542. doi:10.1016/j.mri.2004.01.008


Author Wang, Deming
Doddrell, David. M.
Cowin, Gary
Title A novel phantom and method for comprehensive 3-dimensional measurement and correction of geometric distortion in magnetic resonance imaging
Journal name Magnetic Resonance Imaging   Check publisher's open access policy
ISSN 0730-725X
Publication date 2004-05-01
Sub-type Article (original research)
DOI 10.1016/j.mri.2004.01.008
Volume 22
Issue 4
Start page 529
End page 542
Total pages 14
Editor J. Gore
J. C. Gore
Place of publication New York
Publisher Elsevier
Language eng
Subject C1
249902 Medical Physics
730305 Diagnostic methods
Abstract A phantom that can be used for mapping geometric distortion in magnetic resonance imaging (MRI) is described. This phantom provides an array of densely distributed control points in three-dimensional (3D) space. These points form the basis of a comprehensive measurement method to correct for geometric distortion in MR images arising principally from gradient field non-linearity and magnet field inhomogeneity. The phantom was designed based on the concept that a point in space can be defined using three orthogonal planes. This novel design approach allows for as many control points as desired. Employing this novel design, a highly accurate method has been developed that enables the positions of the control points to be measured to sub-voxel accuracy. The phantom described in this paper was constructed to fit into a body coil of a MRI scanner, (external dimensions of the phantom were: 310 mm x 310 mm x 310 mm), and it contained 10,830 control points. With this phantom, the mean errors in the measured coordinates of the control points were on the order of 0.1 mm or less, which were less than one tenth of the voxel's dimensions of the phantom image. The calculated three-dimensional distortion map, i.e., the differences between the image positions and true positions of the control points, can then be used to compensate for geometric distortion for a full image restoration. It is anticipated that this novel method will have an impact on the applicability of MRI in both clinical and research settings. especially in areas where geometric accuracy is highly required, such as in MR neuro-imaging. (C) 2004 Elsevier Inc. All rights reserved.
Keyword Radiology, Nuclear Medicine & Medical Imaging
Geometric Distortion
3-dimensional Phantom
Comprehensive Assessment
Full Restoration
Magnetic Resonance Imaging
Stereotactic Localization
Accuracy
System
Q-Index Code C1
Additional Notes DOI: 10.1016/j.mri.2004.01.008

 
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Created: Wed, 15 Aug 2007, 13:43:07 EST