Method for a detailed measurement of image intensity nonuniformity in magnetic resonance imaging

Wang, Deming and Doddrell, David M. (2005) Method for a detailed measurement of image intensity nonuniformity in magnetic resonance imaging. Medical Physics, 32 4: 952-960. doi:10.1118/1.1869572


Author Wang, Deming
Doddrell, David M.
Title Method for a detailed measurement of image intensity nonuniformity in magnetic resonance imaging
Journal name Medical Physics   Check publisher's open access policy
ISSN 0094-2405
Publication date 2005-01-01
Sub-type Article (original research)
DOI 10.1118/1.1869572
Volume 32
Issue 4
Start page 952
End page 960
Total pages 9
Editor W. R. Hendee
Place of publication College Park, MD, U.S.A.
Publisher American Association of Physicists in Medicine
Language eng
Subject C1
291501 Clinical Engineering
671402 Medical instrumentation
Abstract In magnetic resonance imaging (MRI), the MR signal intensity can vary spatially and this spatial variation is usually referred to as MR intensity nonuniformity. Although the main source of intensity nonuniformity arises from B, inhomogeneity of the coil acting as a receiver and/or transmitter, geometric distortion also alters the MR signal intensity. It is useful on some occasions to have these two different sources be separately measured and analyzed. In this paper, we present a practical method for a detailed measurement of the MR intensity nonuniformity. This method is based on the same three-dimensional geometric phantom that was recently developed for a complete measurement of the geometric distortion in MR systems. In this paper, the contribution to the intensity nonuniformity from the geometric distortion can be estimated and thus, it provides a mechanism for estimation of the intensity nonuniformity that reflects solely the spatial characteristics arising from B-1. Additionally, a comprehensive scheme for characterization of the intensity nonuniformity based on the new measurement method is proposed. To demonstrate the method, the intensity nonuniformity in a 1.5 T Sonata MR system was measured and is used to illustrate the main features of the method. (c) 2005 American Association of Physicists in Medicine.
Keyword Radiology, Nuclear Medicine & Medical Imaging
Magnetic Resonance Imaging (mri)
Intensity Nonuniformity
Geometric Distortion
Rf Coils
3-d Phantom
Characterization
Quality Assurance (qa)
Phantom
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

 
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Created: Wed, 15 Aug 2007, 16:49:51 EST