Title :
Optimal X-ray imaging geometry for flat-panel cone-beam computed tomography [prostate radiotherapy application]
Author :
Siewerdsen, Jeffrey H. ; Jaffray, David A.
Author_Institution :
Dept. of Radiat. Oncology, William Beaumont Hospital, Royal Oak, MI, USA
Abstract :
A theoretical method for identifying optimal X-ray imaging geometry is presented and applied to cone-beam CT (CBCT) using a flat-panel imager (FPI). The method includes the effects of X-ray source distribution, imaging task, X-ray scatter, and detective quantum efficiency (DQE) on the ICRU-recommended figure of merit for image quality-detectability index. Cascaded systems analysis for FPIs is extended to incorporate the effects of X-ray scatter directly into the DQE. For the FPI-CBCT prototype being implemented for image-guided radiotherapy of the prostate, optimal magnification is ~1.4-1.6, depending primarily on the magnitude of the X-ray scatter fraction
Keywords :
X-ray scattering; biological organs; computerised tomography; radiation therapy; ICRU-recommended figure of merit; X-ray scatter fraction; X-ray source distribution; cascaded systems analysis; detective quantum efficiency; flat-panel cone-beam computed tomography; image quality-detectability index; image-guided radiotherapy; imaging task; medical diagnostic imaging; optimal X-ray imaging geometry; optimal magnification; prostate; Computational geometry; Computed tomography; Frequency; Optical imaging; Particle scattering; System performance; X-ray detection; X-ray detectors; X-ray imaging; X-ray scattering;
Conference_Titel :
Engineering in Medicine and Biology Society, 2000. Proceedings of the 22nd Annual International Conference of the IEEE
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-6465-1
DOI :
10.1109/IEMBS.2000.900680
