The measurement of three dimensional dose distribution of a ruthenium-106 ophthalmological applicator using magnetic resonance imaging of BANG polymer gels

The BANG (RIGS Research Inc., Guilford, CT) polymer gel has been used as a dosimeter to determine three-dimensional (3D) dose distribution of a Ruthenium-106 ophthalmological applicator. An eye phantom made of the BANG gel was irradiated by the Ru-106 source and was MR scanned after two weeks. The MR images were then converted to dose mapping through customized software. The results were comparable with those measured with radiographic films and diodes. It is concluded that the BANG gel dosimetry offers the potential for measuring the dose distribution of an ophthalmologic applicator, in three dimensions, with high spatial resolution and relatively good accuracy.