title: Development of high-radiation-sensitive polymer gel for magnetic resonance imaging in three-dimensional dosimetry.
abstract: We developed a high radiation sensitive polymer gel by modifying the amounts of the gel components and the temperature for the gel preparation. We evaluated its relaxation time linearity against dose and compared the measured dose distribution with the calculated one. For the relaxation time-dose linearity, irradiations were carried out with a linear accelerator using 6 MV photons and doses ranging from 0-5.0 Gy. The relationship between dose and R(2) value (reciprocal of T(2) relaxation time) was measured and it had good linearity over a wide range (0.3-5 Gy). The measured dose distributions were in good agreement with calculated ones. Since the present gel has higher sensitivity and it is synthesized more easily at lower cost than conventional polymer gels, we expect to see improved three-dimensional (3D) dosimetry using it.
authors.affiliation: Department of Medical Physics, National Institute of Radiological Sciences, 4-9-1, Anagawa, Chiba, Japan, 263-8555. shinshin@nirs.go.jp
authors.forename: Shinichiro
authors.initials: S
authors.lastname: Mori
authors.forename: Masahiro
authors.initials: M
authors.lastname: Endo
authors.forename: Shigeo
authors.initials: S
authors.lastname: Furukawa
authors.forename: Masayoshi
authors.initials: M
authors.lastname: Sunaoka
authors.forename: Hiroi
authors.initials: H
authors.lastname: Nonaka
authors.forename: Takayoshi
authors.initials: T
authors.lastname: Ishii
authors.forename: Hiroo
authors.initials: H
authors.lastname: Ikehira
mesh_terms: D004307:Dose-Response Relationship, Radiation; D005782:Gels / Q000737:chemistry*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D011108:Polymers / Q000737:chemistry*; D011829:Radiation Dosage; D011874:Radiometry / Q000295:instrumentation*; D011879:Radiotherapy Dosage; D013696:Temperature
chemical_list: D005782:Gels; D011108:Polymers