DocumentCode :
2856394
Title :
Monochromatic X-ray CT using fluorescent X-rays excited by synchrotron radiation
Author :
Tokumori, Kenji ; Toyofuku, Fukai ; Kanda, Shigenobu ; Baba, Sueki ; Mito, Yoshio ; Hyodo, Kazuyuki ; Ando, Masami ; Uyama, C.
Author_Institution :
Dept. of Oral & Maxillofacial Radiol., Kyushu Univ., Fukuoka, Japan
Volume :
4
fYear :
2000
fDate :
2000
Firstpage :
2987
Abstract :
Monochromatic X-ray CT has several advantages over conventional CT, which utilizes bremsstrahlung white X-rays from an X-ray tube. Although various types of monochromatic X-ray CT systems using synchrotron radiation have been developed using a parallel X-ray beam for imaging of small samples with a high spatial resolution, imaging of large objects such as the human body have not been developed yet. The authors have developed a fan-beam monochromatic X-ray CT system for the large objects. The CT system consists of a fluorescent X-ray source, a rotating table, a CdTe array detector and a personal computer. The fluorescent X-ray source has several advantages such as wide beam size, wide energy range and rapid energy switching and no higher order harmonics. The 256-channel CdTe array detector was used in the photon counting mode. The size of the detector element was 1.98 mm(h)×1.98 mm(w)×0.5 mm(t) and the length of total sensitive area was 512 mm. The authors made phantom experiments using fluorescent X-rays ranging from 42 to 59 keV, CT images of relatively large phantoms such as head phantoms and test phantoms commonly used for conventional CT were obtained. Measured CT numbers were compared with linear attenuation coefficients, and they showed a good linearity over a wide range of contrast media concentrations. Monochromatic X-ray CT images of a head phantom containing gadolinium contrast medium were obtained at the energies just above and below the gadolinium K-edge. A gadolinium image was also obtained by K-edge subtraction
Keywords :
biomedical equipment; bremsstrahlung; computerised tomography; fluorescence; synchrotron radiation; 0.5 mm; 1.98 mm; 42 to 59 keV; 512 mm; CdTe; CdTe array detector; Gd; K-edge subtraction; contrast media concentration; detector element size; fan-beam monochromatic X-ray CT system; fluorescent X-ray source; fluorescent X-rays excited by synchrotron radiation; head phantoms; higher order harmonics; human body; linear attenuation coefficients; medical diagnostic imaging; rotating table; test phantoms; total sensitive area; Computed tomography; Detectors; Fluorescence; Head; High-resolution imaging; Imaging phantoms; Optical imaging; Sensor arrays; Synchrotron radiation; X-ray imaging;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Engineering in Medicine and Biology Society, 2000. Proceedings of the 22nd Annual International Conference of the IEEE
Conference_Location :
Chicago, IL
ISSN :
1094-687X
Print_ISBN :
0-7803-6465-1
Type :
conf
DOI :
10.1109/IEMBS.2000.901507
Filename :
901507
Link To Document :
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