Study on Dual-Energy X-ray Computed Tomography using Synchrotron Radiation
- National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555 (Japan)
- Kitasato University, School of Veterinary Medicine and Animal Sciences, 35-1 Higashi 23-Bancho, Towada-Shi, Aomori 034-8628 (Japan)
- Japan Synchrotron Radiation Research Institute, 1-1 Koto, Mikazuki-cho, Sayo-gun, Hyogo 679-5198 (Japan)
The electron density is one of the most important elements for the treatment planning in the radiotherapy, because this information is used for the range estimation of the heavy-ion beam. In order to measure more precise electron density, we have developed the dual-energy x-ray CT system using synchrotron radiation. The x-ray detector consists of 256 x 96 scintillator-array. It can take more than a hundred projection images per second. The response of the detector to x-rays was proved to be linear up to at least 1013 photon/pixel. The experiments were carried out using two monochromatic x-rays of 40 keV and 70 keV at the beam-line BL20B2 of SPring-8. As the results from samples of water, ethanol and solutions of dipotassium hydrogenphosphate with five concentrations, the electron densities measured in the dual-energy x-ray CT method were in agreement with the theoretical values by about {+-} 1%. This is almost the same level as that achieved by the one-dimensional CT system we developed previously. In addition, a sample of kidney of a pig fixed by formalin neutral buffer solution was used to distinguish the tissues in the CT images based on the electron density and the effective atomic number that was additionally obtained in the dual-energy x-ray CT. It suggested that renal pelvis was enriched with adipose tissue, and it was difficult to distinguish renal cortex and renal medulla.
- OSTI ID:
- 20652883
- Journal Information:
- AIP Conference Proceedings, Vol. 705, Issue 1; Conference: 8. international conference on synchrotron radiation instrumentation, San Francisco, CA (United States), 25-29 Aug 2003; Other Information: DOI: 10.1063/1.1758056; (c) 2004 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
Similar Records
SU-E-I-78: Improving Prostatic Delineation Using Dual-Energy CT
WE-A-BRF-01: Dual-Energy CT Imaging in Diagnostic Imaging and Radiation Therapy
Related Subjects
ADIPOSE TISSUE
CAT SCANNING
ELECTRON DENSITY
ETHANOL
FORMALDEHYDE
HEAVY IONS
IMAGE PROCESSING
ION BEAMS
KEV RANGE 10-100
KIDNEYS
MONOCHROMATIC RADIATION
PELVIS
PHOTONS
RADIOTHERAPY
SOLUTIONS
SPRING-8 STORAGE RING
SWINE
SYNCHROTRON RADIATION
WATER
X RADIATION