T. Yuasa et al., RECONSTRUCTION METHOD FOR FLUORESCENT X-RAY COMPUTED-TOMOGRAPHY BY LEAST-SQUARES METHOD USING SINGULAR-VALUE DECOMPOSITION, IEEE transactions on nuclear science, 44(1), 1997, pp. 54-62
We describe a new attenuation correction method for fluorescent X-ray
computed tomography (FXCT) applied to image nonradioactive contrast ma
terials in vivo. The principle of the FXCT imaging is that of computed
tomography of the first generation, Using monochromatized synchrotron
radiation from the BLNE-5A bending-magnet beam line of Tristan Accumu
lation Ring in KEK, Japan, we studied phantoms with the FXCT method, a
nd we succeeded in delineating a 4-mm-diameter channel filled with a 5
00 mu g I/ml iodine solution in a 20-mm-diameter acrylic cylindrical p
hantom, However, to detect smaller iodine concentrations, attenuation
correction is needed, We present a correction method based on the equa
tion representing the measurement process, The discretized equation sy
stem is solved by the least-squares method using the singular value de
composition, The attenuation correction method is applied to the proje
ctions by the Monte Carlo simulation and the experiment to confirm its
effectiveness.