title: An image-based approach to measure the ferric ion diffusion coefficient in fricke gel dosimetry.
abstract: 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.
authors.affiliation: Institutes of Biomedical Engineering, University Systems of Taiwan - National Yang Ming University, Pei-Tou, Taipei, Taiwan.
authors.forename: Y
authors.initials: Y
authors.lastname: Tseng
authors.forename: Sung-Cheng
authors.initials: SC
authors.lastname: Huang
authors.forename: W
authors.initials: W
authors.lastname: Chu