Geometric distortion in clinical MRI systems - Part I: evaluation using a 3D phantom

Wang, D., Strugnell, W., Cowin, G., Doddrell, D. M. and Slaughter, R. (2004) Geometric distortion in clinical MRI systems - Part I: evaluation using a 3D phantom. Magnetic Resonance Imaging, 22 9: 1211-1221. doi:10.1016/j.mri.2004.08.012

Author Wang, D.
Strugnell, W.
Cowin, G.
Doddrell, D. M.
Slaughter, R.
Title Geometric distortion in clinical MRI systems - Part I: evaluation using a 3D phantom
Journal name Magnetic Resonance Imaging   Check publisher's open access policy
ISSN 0730-725X
Publication date 2004-11
Sub-type Article (original research)
DOI 10.1016/j.mri.2004.08.012
Volume 22
Issue 9
Start page 1211
End page 1221
Total pages 11
Editor Gore, J. C.
Place of publication United States
Publisher Elsevier Inc
Collection year 2004
Language eng
Subject C1
249902 Medical Physics
730305 Diagnostic methods
Abstract Recently, a 3D phantom that can provide a comprehensive and accurate measurement of the geometric distortion in MRI has been developed. Using this phantom, a full assessment of the geometric distortion in a number of clinical MRI systems (GE and Siemens) has been carried out and detailed results are presented in this paper. As expected, the main source of geometric distortion in modern superconducting MRI systems arises from the gradient field nonlinearity. Significantly large distortions with maximum absolute geometric errors ranged between 10 and 25 mm within a volume of 240 x 240 x 240 mm(3) were observed when imaging with the new generation of gradient systems that employs shorter coils. By comparison, the geometric distortion was much less in the older-generation gradient systems. With the vendor's correction method, the geometric distortion measured was significantly reduced but only within the plane in which these 2D correction methods were applied. Distortion along the axis normal to the plane was, as expected, virtually unchanged. Two-dimensional correction methods are a convenient approach and in principle they are the only methods that can be applied to correct geometric distortion in a single slice or in multiple noncontiguous slices. However, these methods only provide an incomplete solution to the problem and their value can be significantly reduced if the distortion along the normal of the correction plane is not small. (C) 2004 Elsevier Inc. All rights reserved.
Keyword Radiology, Nuclear Medicine & Medical Imaging
Geometric Distortion
Comprehensive Assessment
Vendor's Correction Method
3d Phantom
Gradient Field Distortions
Stereotactic Localization
Quality Assurance
Q-Index Code C1

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Created: Wed, 15 Aug 2007, 03:49:56 EST