| Автор | Torje V Pedersen |
| Автор | Dag R Olsen |
| Автор | Arne Skretting |
| Дата выпуска | 1997-08-01 |
| dc.description | A method has been developed to determine the diffusion coefficients of ferric ions in ferrous sulphate doped gels. A radiation induced edge was created in the gel, and two spin-echo sequences were used to acquire a pair of images of the gel at different points of time. For each of these image pairs, a longitudinal relaxation rate image was derived. From profiles through these images, the standard deviations of the Gaussian functions that characterize diffusion were determined. These data provided the basis for the determination of the ferric diffusion coefficients by two different methods. Simulations indicate that the use of single spin-echo images in this procedure may in some cases lead to a significant underestimation of the diffusion coefficient. The technique was applied to different agarose and gelatine gels that were prepared, irradiated and imaged simultaneously. The results indicate that the diffusion coefficient is lower in a gelatine gel than in an agarose gel. Addition of xylenol orange to a gelatine gel lowers the diffusion coefficient from 1.45 to , at the cost of significantly lower sensitivity. The addition of benzoic acid to the latter gel did not increase the sensitivity. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Measurement of the ferric diffusion coefficient in agarose and gelatine gels by utilization of the evolution of a radiation induced edge as reflected in relaxation rate images |
| Тип | paper |
| DOI | 10.1088/0031-9155/42/8/008 |
| Electronic ISSN | 1361-6560 |
| Print ISSN | 0031-9155 |
| Журнал | Physics in Medicine and Biology |
| Том | 42 |
| Первая страница | 1575 |
| Последняя страница | 1585 |
| Аффилиация | Torje V Pedersen; Department of Medical Physics and Technology, The Norwegian Radium Hospital, Montebello, N-0310 Oslo, Norway |
| Аффилиация | Dag R Olsen; Department of Medical Physics and Technology, The Norwegian Radium Hospital, Montebello, N-0310 Oslo, Norway |
| Аффилиация | Arne Skretting; Department of Medical Physics and Technology, The Norwegian Radium Hospital, Montebello, N-0310 Oslo, Norway |
| Выпуск | 8 |
