Abstract
In polymer gel dosimetry, Magnetic Resonance Imaging (MRI) provides the spin-spin relaxation rate R2=1/T2 image data, which in turn is correlated with the absorbed dose in the irradiated gel dosimeter. The aim of this work is to compare two different mathematical models in determining R2, in terms of precision namely: i) the routinely applied conventional linear regression fitting model, and ii) a new weighted fitting model, which is based on the random noise figure applied for each signal of the T2 decay curve. To investigate the precision of the above models over a wide range of T2 values we have manufactured VIPAR gels with varying gelatine content and irradiated them to known doses.
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