&lt;title&gt;High-speed soft x-ray generators in biomedicine&lt;/title&gt;

Satô, Eiichi; Sagae, Michiaki; Takahashi, Kei; Oizumi, Teiji; Ojima, Hidenori; Takayama, K.; Takayama, Yoshiharu; Yanagisawa, Toru; Fujiwara, Aya; Mitoya, Kanji

doi:10.1117/12.209662

Cited by 19 publications

(12 citation statements)

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“…44 (4) ber of the target element, and high-photon-energy bremsstrahlung x-rays are not absorbed effectively in the plasma. Therefore, the condenser charging voltage should be raised as high as possible to increase the characteristic x-ray intensity.…”

Section: -4 Optical Engineeringmentioning

confidence: 99%

“…44 (4) set in the cathode electrode. As electron beams from the cathode electrode are roughly converged to the target by an electric field in the tube, the weakly ionized plasma, which consists of cerium ions and electrons, forms around the target by evaporating.…”

Section: -2 Optical Engineeringmentioning

confidence: 99%

“…[1][2][3][4][5] In the cases of multishot and cine radiographies, we have developed several different repetitive-flash [6][7][8][9][10] and stroboscopic x-ray generators. [11][12][13][14][15][16][17] Although most flash x-ray generators have cold-cathode tubes, the stroboscopic generators utilize hotcathode tubes.…”

Section: Introductionmentioning

confidence: 99%

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High-speed enhanced K-edge angiography utilizing cerium plasma x-ray generator

et al. 2005

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The cerium target plasma flash x-ray generator is useful to perform high-speed enhanced K-edge angiography using cone beams, because K-series characteristic x-rays from the cerium target are absorbed effectively by iodine-based contrast mediums. In the plasma generator, a 200-nF condenser is charged up to 60 kV by a power supply, and flash x-rays are produced by the discharging. The x-ray tube is a demountable triode with a trigger electrode, and the turbomolecular pump evacuates air from the tube with a pressure of approximately 1 mPa. Target evaporation leads to the formation of weakly ionized linear plasma, consisting of cerium ions and electrons, around the target, and intense flash x-rays are produced. At a charging voltage of 55 kV, the maximum tube voltage is almost equal to the charging voltage of the main condenser, and the maximum current is approximately 20 kA. When the charging voltage is increased, weakly ionized cerium plasma forms, and the K-series characteristic x-ray intensities increase. The x-ray pulse widths are about 500 ns, and the time-integrated x-ray intensity has a value of about 40 C/kg at 1.0 m from the x-ray source with a charging voltage of 55 kV. In the angiography, we employ a filmless computed radiography (CR) system and iodine-based microspheres.

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Section: -4 Optical Engineeringmentioning

confidence: 99%

Section: -2 Optical Engineeringmentioning

confidence: 99%

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High-speed enhanced K-edge angiography utilizing cerium plasma x-ray generator

et al. 2005

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“…[3][4][5][6][7][8][9][10][11][12][13][14][15] Currently, when the plasma x-ray source is formed, the conversion efficiency of the electrostatic energies into x-rays substantially increases, and the high-intensity characteristic x-rays are produced. Therefore, we have designed several different plasma x-ray generators16-20 and have performed fundamental experiments for producing higher-intensity characteristic x-rays.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of the plasma flash x-ray generator and applications

et al. 1999

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“…Particularly, soft generators with energies of less than 150 keV have been applied to image biomedical objects. [3][4][5][6][7][8][9][10][11][12][13][14] Most flash x-ray generators have the high-voltage condenser in conjunction with a cold-cathode radiation tube, and the plasma x-ray source becomes to form and grow according to increases in the electrostatic energies in the condenser. Generally, when the plasma x-ray source is formed, the conversion efficiency of the electrostatic energies into x-rays substantially increases, and the high-intensity characteristic x-rays are produced.…”

Section: Introductionmentioning

confidence: 99%

<title>Tentative study on x-ray enhancement by fluorescent emission of radiation by plasma x-ray source</title>

Satô

Sagae

Ichimaru

et al. 1999

Radiation Sources and Radiation Interactions

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Tentative study on characteristic x-ray enhancement by fluorescent emission of radiation by plasma x-ray source is described. The enhancement was performed by the plasma flash x-ray generator having a cold-cathode triode. And the generator employs a high-voltage power supply, a low-impedance coaxial transmission line with a gap switch, a high-voltage condenser with a capacity of 200 nF, a turbo-molecular pump, a thyristor pulser as a trigger device, and a flash x-ray tube. The high-voltage main condenser is charged up to 60 kV by the power supply, and the electric charges in the condenser are discharged to the tube after triggering the cathode electrode. The flash x-rays are then produced. The x-ray tube is of a demountable triode that is connected to the turbo molecular pump with a pressure of approximately 1 mPa. As the electron flows from the cathode electrode are roughly converged to the target by the electric field in the tube, the plasma x-ray source, which consists of metal ions and electrons, forms by the target evaporating. Both the tube voltage and current displayed damped oscillations, and their peak values increased according to increases in the charging voltage. In the present work, the peak tube voltage was almost equivalent to the initial charging voltage of the main condenser, and the peak current was less than 30 kA. The characteristic x-ray intensity substantially increased according to the growth in the plasma x-ray source. When the linear plasma x-ray source formed, the bremsstrahlung x-rays were absorbed without using a monochromatic filter, and highintensity characteristic x-rays were produced.

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<title>High-speed soft x-ray generators in biomedicine</title>

Cited by 19 publications

References 0 publications

High-speed enhanced K-edge angiography utilizing cerium plasma x-ray generator

High-speed enhanced K-edge angiography utilizing cerium plasma x-ray generator

Characteristics of the plasma flash x-ray generator and applications

<title>Tentative study on x-ray enhancement by fluorescent emission of radiation by plasma x-ray source</title>

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