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Abstract #3237

The influence of temperature on polymer gel radiation dosimetry with MRI

Hiromi Sano 1,2 , Takayuki Obata 3 , Hiroshi Kawaguchi 1 , Kuniaki Nabatame 2 , Satoshi Obara 2 , Jeff Kershaw 1 , Keiichi Akahane 2 , Yoshiya Shimada 2 , and Hiroshi Ito 1

1 Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Chiba, Japan, 2 Medical Exposure Research Project, National Institute of Radiological Sciences, Chiba, Chiba, Japan, 3 Research Centre for Charged Particle Therapy, National Institute of Radiological Sciences, Chiba, Chiba, Japan

Irradiation dose can be three-dimensionally visualized with polymer gel dosimetry and multi-slice R2 mapping. However, the high number of RF pulses may increase the temperature of the polymer gel, which causes errors in dose estimation because the R2 depends on temperature as well as the radiation dose. In this study, we investigated the relationship between changes to R2 and temperature caused by RF pulses in a polymer gel phantom. A temperature rise of 1 C caused a 0.099 s -1 reduction in R2, which suggests that temperature control and/or correction is needed to reduce errors in polymer gel dosimetry with MRI

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