| Autor: |
Eiichi SATO, Hitomi ITO, Yasuyuki ODA, Osahiko HAGIWARA, Hiroshi MATSUKIYO, Toshiyuki ENOMOTO, Manabu WATANABE, Shinya KUSACHI |
| Jazyk: |
angličtina |
| Rok vydání: |
2016 |
| Předmět: |
|
| Zdroj: |
Mechanical Engineering Journal, Vol 3, Iss 6, Pp 16-00308-16-00308 (2016) |
| Druh dokumentu: |
article |
| ISSN: |
2187-9745 |
| DOI: |
10.1299/mej.16-00308 |
| Popis: |
Dual-energy photon counting was performed using an energy-selecting device (ESD) and a cadmium telluride detector. The ESD is used to determine a low-energy range for computed tomography (CT) and consists of two comparators and a microcomputer (MC). The two threshold energies are determined using low and high-energy comparators, respectively. The MC in the ESD produces a single logical pulse when only a logical pulse from the low-energy comparator is input to the MC. To determine the high-energy range, logical pulses from the high-energy comparator are input to the MC outside the ESD. Logical pulses from the two MCs are input to frequency-voltage converters (FVCs) to convert count rates into voltages. The output voltages from the two FVCs are sent to a personal computer through an analog-digital converter to reconstruct tomograms. Dual-energy CT was accomplished at a tube voltage of 70 kV and a maximum count rate of 4.5 kilocounts per second, and two-different-energy tomograms were obtained simultaneously using iodine media. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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