کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5430914 | 1397427 | 2007 | 16 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: A sensitivity function-based conjugate gradient method for optical tomography with the frequency-domain equation of radiative transfer A sensitivity function-based conjugate gradient method for optical tomography with the frequency-domain equation of radiative transfer](/preview/png/5430914.png)
The Sensitivity Function-based Conjugate Gradient Method (SFCGM) is described. This method is used to solve the inverse problems of function estimation, such as the local maps of absorption and scattering coefficients, as applied to optical tomography for biomedical imaging. A highly scattering, absorbing, non-reflecting, non-emitting medium is considered here and simultaneous reconstructions of absorption and scattering coefficients inside the test medium are achieved with the proposed optimization technique, by using the exit intensity measured at boundary surfaces. The forward problem is solved with a discrete-ordinates finite-difference method on the framework of the frequency-domain full equation of radiative transfer. The modulation frequency is set to 600Â MHz and the frequency data, obtained with the source modulation, is used as the input data. The inversion results demonstrate that the SFCGM can retrieve simultaneously the spatial distributions of optical properties inside the medium within a reasonable accuracy, by significantly reducing a cross-talk between inter-parameters. It is also observed that the closer-to-detector objects are better retrieved.
Journal: Journal of Quantitative Spectroscopy and Radiative Transfer - Volume 104, Issue 1, March 2007, Pages 24-39