Abstract
To obtain two kinds of tomograms at two different X-ray energy ranges simultaneously, we have constructed a dual-energy X-ray photon counter with a lutetium-oxyorthosilicate photomultiplier detector system, three comparators, two microcomputers, and two frequency-voltage converters. X-ray photons are detected using the detector system, and the event pulses are input to three comparators simultaneously to determine threshold energies. At a tube voltage of 100 kV, the three threshold energies are 16, 35 and 52 keV, and two energy ranges are 16 - 35 and 52 - 100 keV. X-ray photons in the two ranges are counted using microcomputers, and the logical pulses from the two microcomputers are input to two frequency-voltage converters. In dual-energy computed tomography (CT), the tube voltage and current were 100 kV and 0.29 mA, respectively. Two tomograms were obtained simultaneously at two energy ranges. The energy ranges for gadolinium-L-edge and K-edge CT were 16 - 35 and 52 - 100 keV, respectively. The maximum count rate of dual-energy CT was 105 kilocounts per second with energies ranging from 16 to 100 keV, and the exposure time for tomography was 19.6 min.
Highlights
Monochromatic parallel X-ray beams [1] [2] are produced using a synchrotron and silicon single crystals and have been applied to perform enhanced iodine (I) K-edge angiography
The DE counter consists of the LSO-photomultiplier tube (PMT) detector, an inverse high-speed voltage-voltage (V-V) amplifier, a pulse-width extender, three comparators (STMicroelectronics, TS3022), two microcomputers (MCs; Atmel, ATMEGA168P-20PU), and two frequency-voltage converters (FVCs)
We are performing a DE-computed tomography (CT) using a cadmium telluride (CdTe) array detector made by XCounter, the first-generation energy-dispersive CT with the single detector is useful for carrying out fundamental experiments concerning various photon counting detectors, confirming the imaging effect with changes in the detector, and reducing the cost of the CT scanner
Summary
Monochromatic parallel X-ray beams [1] [2] are produced using a synchrotron and silicon single crystals and have been applied to perform enhanced iodine (I) K-edge angiography. Using this imaging, fine coronary arteries below 100 microns in diameter can be observed at high contrasts. Preclinical energy-dispersive computed tomography (CT) scanners [6] [7] [8] have been developed using cadmium telluride (CdTe) array detectors In this regard, we are developing an energy-dispersive CT scanner using a dual-energy CdTe array detector [9] to perform high-speed energy-dispersive CT
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