Correction of intensity nonuniformity in spin-echo T(1)-weighted images.
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.
Collewet
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G
Cemagref, 17 Avenue de Cucillé, 35044 Rennes Cedex, France. guylaine.collewet@cemagref.fr
Davenel
A
A
Toussaint
C
C
Akoka
S
S
D000818:Animals; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging / Q000379:methods; D019047:Phantoms, Imaging; D012474:Salmon