Correction of intensity nonuniformity in spin-echo T(1)-weighted images |
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Authors: | Collewet G Davenel A Toussaint C Akoka S |
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Affiliation: | Cemagref, 17 Avenue de Cucillé, 35044 Rennes Cedex, France. guylaine.collewet@cemagref.fr |
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Abstract: | This paper presents a method to correct intensity nonuniformity in spin-echo T(1)-weighted images and particularly the inhomogeneities due to RF transmission imperfections which have tissue-dependent effects through the T(1) relaxation times. This method is based on the use of a uniform phantom, first for classic normalization by division by the phantom images, and second for T(1)-correction using the RF transmitted cartography. We present experimental results from a bi-phasic (oil/water) phantom and from a salmon with a 0.2 T imager. The results demonstrate the efficiency of the method in the two cases and its ability to cope with partial volume effect. |
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