An image-based approach to measure the ferric ion diffusion coefficient in fricke gel dosimetry.
A numerical method was adopted to solve the diffusion equation to determine ferric ion diffusion coefficient in Fricke-agarose gels. A fast MR acquisition technique was employed to avoid smearing of acquired data due to diffusion over an extended time period. Our results show that for a Fricke gel contained 1 mM ammonium ferrous sulfate, 1% agarose, 1 mM sodium chloride and 50 mM sulfuric acid, its ferric ion diffusion coefficient is 1.73 10-2cm2h-1in room temperature. This value is consistent with the 1 ~ 2 10-2cm2h-1range obtained by previous studies under varying concentrations of gel ingredients.
Tseng
Y
Y
Institutes of Biomedical Engineering, University Systems of Taiwan - National Yang Ming University, Pei-Tou, Taipei, Taiwan.
Huang
Sung-Cheng
SC
Chu
W
W