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Volume 9 (1992)
- Issue 3 Pages 101-
- Issue 2 Pages 53-
- Issue 1 Pages 1-
Volume 9, Issue 2
Displaying 1-5 of 5 articles from this issue
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Eiichi SATO, Haruo OBARA, Teiji OIZUMI, Yasuomi HAYASI, Yutaka OHTA, H ...1992 Volume 9 Issue 2 Pages 53-60
Published: 1992
Released on J-STAGE: August 27, 2012
JOURNAL FREE ACCESSA repetitive flash x-ray generator utilizing a hot-cathode diode in conjunction with a modified Blumlein pulser for biomedical radiography is described. This generator consisted of the following essential components: a constant high-voltage power supply with a maximum voltage of 100 kV, an energy-storage condenser of 97 nF, a high-voltage pulser, a DC power supply for the filament, and an x-ray tube. The x-ray tube was of the glass-enclosed diode and consisted of the following major devices: a plate target made of tungsten, a hot cathode (filament) made from a tungsten wire, a focusing electrode made of iron, and a glass tube body. The two ceramic condensers in the high-voltage pulser were charged from -50 to -70 kV, and the peak voltages of the pulser output were about -1.4 times the condenser charged voltage. The tube voltages were nearly equivalent to the pulser outputs, and the tube currents were considered to be a value of less than 0.6 A. The effective durations of the flash x rays were less than 10 μs, and the maximum x-ray intensity was 43 nC/kg at 0.5 m per pulse with a charged voltage of -70 kV. The repetitive rate of the flash x rays was less than 40 Hz, and the sizes of the xray source were about 4×4 mm.View full abstractDownload PDF (2661K) -
Eiichi SATO, Michiaki SAGAE, Teiji OIZUMI, Hiroyasu ARIMA, Yoshiharu T ...1992 Volume 9 Issue 2 Pages 61-66
Published: 1992
Released on J-STAGE: August 27, 2012
JOURNAL FREE ACCESSThe constructions and the fundamental studies for the high-speed x-ray television (TV) system utilizing a flash memory device in conjunction with a high-speedc harge-coupled-devic(eC CD)c amera are described. This system can be applied to low-noise type flash x-ray generators and consisted of the following essential components: a repetitive flash x-ray generator, an image intensifier (II), a highspeed CCD camera, a flash memory device, a timing device between the x-ray generator and the flash memory device, and an image processor. The radiographic images from an II were taken by a CCD camerai n conjunctionw ith a flash memoryd evice. Theses troboscopici magesw erer ecordedb y a video tape recorder (VTR) and were reproduced and analyzed by the image processor having a color printer. The flash memory device was connected to the pulsed x-ray generator through a timing device utilizing a light coupling system. The frame speed of the TV system was controlled by the flash memory system in conjunction with a repetitive flash light system. When a home-video system was employed, the maximum frame speed was 30 fps (Hz).View full abstractDownload PDF (2544K) -
Eiichi SATO, Arimitsu SHIKODA, Teiji OIZUMI, Yutaka OHTA, Haruo OBARA, ...1992 Volume 9 Issue 2 Pages 67-74
Published: 1992
Released on J-STAGE: August 27, 2012
JOURNAL FREE ACCESSThe constructions and the fundamental studies for the high-intensity flash x-ray generator utilizing a surface-discharge radiation tube in conjunction with a large capacity condenser are described. This generator consisted of the following essential components: a high-voltage power supply, a coaxial oil condenser of 199 nF, a turbo molecular pump, a trigger device for the surface-discharge cathode, and an x-ray tube. The x-ray tube was of the demountable-type which was connected to a turbo molecular lecular pump operated at a pressure of 1.3×10-3 Pa and consisted of the following major devices: a rod-shaped long anode tip made of tungsten, a surface-discharge cathode made from a ferrite plate, and a tube body made of stainless steel. The high-voltage condenser was charged from 30 to 50 kV, and the electric charges in the condenser were discharged to the x-ray tube when a surface discharge was caused on the ferrite cathode by the triggering. The maximum tube voltage was equivalent to the initial charged voltage, and both the maximum current and the current duration with a charged voltage of 50 kV were 13kA and 40μs, respectively. The pulse widths of the flash x rays were less than 3μs, and the maximum x-ray intensity was about 6μC/kg at 1.0m per pulse.View full abstractDownload PDF (1583K) -
Eiichi SATO, Michiaki SAGAE, Shingo KIMURA, Arimitsu SHIKODA, Teiji OI ...1992 Volume 9 Issue 2 Pages 75-82
Published: 1992
Released on J-STAGE: August 27, 2012
JOURNAL FREE ACCESSA repetitive kilohertz-range flash x-ray generator utilizing a hot-cathode triode in conjunction with a new type of grid control device is described. This generator consisted of the following essential components: a constant high-voltage power supply with a maximum voltage of 100 kV, an energy storage condenser of 97 nF, a repetitive grid control device, and a hot-cathode triode. The energystorage condenser was charged from 50 to 70 kV by a power supply, and the electric charges in the condenser were discharged repetitively by the grid electrode driven by the grid control device. The maximum values of both the tube voltage and the tube current were 70 kV and about 0.4 A, respectively. The duration of pulsed x rays was primarily determined by the time constant of the grid control device and the cutoff voltage of thermoelectrons. The effective duration and the x-ray intensity were about 0.8 ms and 0.62μC/kg at 1.0m per pulse, respectively, with an initial grid voltage of -1.5 kV, a charging resistance of 2.0 MΩ, and a condenser charged voltage of 70 kV. The maximum repetitive frequency was about 1 kHz, and the size of the x-ray source was less than 4×4mm.View full abstractDownload PDF (1781K) -
Animal ExperimentH. FUKAGAWA, Y. SUZUKI, T. YAMAGUCHI, S. HASEGAWA, K. HYODO, M. ANDO, ...1992 Volume 9 Issue 2 Pages 83-90
Published: 1992
Released on J-STAGE: August 27, 2012
JOURNAL FREE ACCESSX-ray K-edge energy subtraction television system for noninvasive angiography was implemented using high speed monochromator, X-ray image intensifier, special prism and two CCD cameras combined with synchrotron radiation system at the National Laboratory for High Energy Physics (KEK), Tsukuba, Japan. Each exposure for dual energy monochromatized X-ray and interval times are 2 ms. Angiograms of an anesthetized dog were obtained as real time images.View full abstractDownload PDF (2967K)
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