Simple methods for the correction of T2 maps of phantoms

Lepage, M., Tofts, P. S., Back, S. A., Jayasekera, P. M. and Baldock, C. (2001) Simple methods for the correction of T2 maps of phantoms. Magnetic Resonance in Medicine, 46 (6). pp. 1123-9. ISSN 0740-3194

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Abstract

Two simple methodologies for correcting the errors in T2 maps for phantom measurements are presented; they both give accurate MRI maps with a low coefficient of variation (CV). The rate correction method is based on an equation relating the true T2 (T2,t) and that determined experimentally (T2,exp) for homogenous phantoms. The response matrix method is a phenomenological analysis of the difference between T2,exp and T2,t, from which correction factors are computed for a range of T2 values and for every pixel of an image. The factors were obtained from phantoms filled with a homogeneous gelatin gel and having different T2,t values. The CV in homogeneous phantom measurements were reduced from 2.5-4.0% to approximately 0.6-2.0% for T2,t values ranging from 180-600 ms. Examples are shown for the correction of T2 maps of phantoms filled with polymer dosimeter gel irradiated with photon beams from a linear accelerator. The methodologies presented can easily be implemented on a clinical MRI scanner.

Item Type: Article
Keywords: Humans Magnetic Resonance Imaging/instrumentation/ methods Phantoms, Imaging
Schools and Departments: Brighton and Sussex Medical School > Brighton and Sussex Medical School
Depositing User: Paul Stephen Tofts
Date Deposited: 13 Mar 2007
Last Modified: 30 Nov 2012 16:50
URI: http://sro.sussex.ac.uk/id/eprint/855
Google Scholar:16 Citations
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