Application of Loading Phantom for Magnetic ResonanceImaging in Polymer Gel Dosimetry

• Main Authors: Chian-Huei Hung, 洪千惠
• Other Authors: Chen-Jung Chang
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/38802808668722513115

碩士 === 中臺科技大學 === 放射科學研究所 === 99 === The sensitivity of polymer gel dosimeter is high in radiation detection, which will be polymerized or cross-linked under the radiation exposure. Magnetic Resonance Imaging (MRI) was recognized as the most potential device in measuring the radiation dosage by gel dosimeters. However, the image quality of MRI is highly affected by the materials of the loading phantom, which can carry the test tubes in position during MRI testing. Therefore, in this study, the disc-shaped prosthesis, whole solid phantom and Gd jelly phantom were compared in the dose-response curve, image nonuniformity and SNR in the standard imaging quality. The results demonstrated that the Gd jelly phantom and the whole solid phantom display higher imaging quality nonuniformity (1.60%~1.84 %) and higher SNR (391~513), respectively. In addition, the dose scale method (scale=0.2, 0.5 and 1Gy) was utilized to study the dose discrimination of MRI. The discrimination in the dose range of 0~1.6 Gy and 12~16 Gy were 0.2 Gy and 0.5 Gy, respectively. The results showed that the loading phantom could easily promote the MRI imaging quality of the Polymer gel dosimeter.