Title :
A novel method for determining source spectrum/detector spectral response in X-ray imaging
Author :
Yu, Lifeng ; Sidky, Emil Y. ; Pan, Xiaochuan
Author_Institution :
Dept. of Radiol., Chicago Univ., IL, USA
Abstract :
Knowledge of the X-ray spectrum in diagnostic imaging is important for dose calculations and correction for beam-hardening artifacts. This work investigates the possibility of determining the X-ray source spectrum from transmission data of a known phantom. In addition to the design of the phantom, the novel aspect of this work is the application of the expectation-maximization method, widely used in tomographic image reconstruction, in solving the ill-posed problem of finding the X-ray spectrum from transmission data.
Keywords :
X-ray spectra; computerised tomography; diagnostic radiography; dosimetry; image reconstruction; iterative methods; medical image processing; phantoms; X-ray imaging; X-ray spectrum; beam-hardening artifacts; diagnostic imaging; dose calculations; expectation-maximization method; ill-posed problem; phantom; source spectrum; spectral response; tomographic image reconstruction; transmission data; Attenuation; Computed tomography; Image reconstruction; Imaging phantoms; Integral equations; Linear systems; Optical imaging; X-ray detection; X-ray detectors; X-ray imaging;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2003 IEEE
Print_ISBN :
0-7803-8257-9
DOI :
10.1109/NSSMIC.2003.1352505
