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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