Title :
Multiple energy computed tomography with monochromatic X-rays from the NSLS
Author :
Dilmanian, F.A. ; Nachaliel, E. ; Garrett, R.F. ; Thomlinson, W.C. ; Chapman, L.D. ; Moulin, H.R. ; Oversluizen, T. ; Rarback, H.M. ; Rivers, M. ; Spanne, P. ; Thompson, A.C. ; Zeman, H.D.
Author_Institution :
Brookhaven Nat. Lab., Upton, NY, USA
Abstract :
Monochromatic X-rays from the X17 superconducting wiggler beamline at the National Synchrotron Light Source (NSLS) were used for dual-energy quantitative computed tomography (CT) of a 27-ram-diameter phantom containing solutions of different KOH concentrations in cylindrical holes of 5-mm diameter. The CT configuration was a fixed horizontal fan-shaped beam of 1.5-mm height and 30-mm width, and a subject rotating around a vertical axis. The transmitted X-rays were detected by a linear-array Si(Li) detector with 120 elements of 0.25-mm width each. A two-crystal Bragg-Bragg fixed-exit monochromator with Si<220> crystals was used. Dual photon absorptiometry CT data were taken at 20 and 38 keV. The reconstructed phantom images show the potential of the system for quantitative CT.<>
Keywords :
computerised tomography; synchrotron radiation; 0.25 mm; 1.5 mm; 20 keV; 27 mm; 30 mm; 38 keV; 5 mm; Bragg-Bragg fixed-exit monochromator; KOH; National Synchrotron Light Source; Si:Li; X17 superconducting wiggler beamline; cylindrical holes; dual photon absorptiometry; horizontal fan-shaped beam; linear-array detector; medical diagnostic imaging; monochromatic X-rays; multiple energy computer tomography; quantitative CT; reconstructed phantom images; vertical axis; Computed tomography; Image reconstruction; Imaging phantoms; Light sources; Photonic crystals; Synchrotrons; Undulators; X-ray detection; X-ray detectors; X-ray imaging;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1991., Conference Record of the 1991 IEEE
Conference_Location :
Santa Fe, NM, USA
Print_ISBN :
0-7803-0513-2
DOI :
10.1109/NSSMIC.1991.259231
