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28 May 1999 Laser-produced plasma (LPP) x-ray source with BaF2 and rare-earth targets for application in dual-energy subtraction angiography (DESA)
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Abstract
A laser produced plasma (LPP) x-ray source utilizing ultra- fast laser was investigated in the context of its utility for dual energy subtraction angiography. Experiments were performed with a Table Top Terawatt (TTT) laser using BaF2 and rare-earth metal targets including La, Ce, Nd and Gd. The laser was operated in a single-pulse or in a dual pulse mode with surface power density in the 1018 - 1019 Wcm-2 range with pulse duration of 150 or 450 fs. Infrared and/or green beams were utilized. Hot electrons' temperature was in the 35 - 50 keV range. The obtained LPP x- ray spectra were comprised of a continuous bremsstrahlung component as well as discrete characteristic lines. The bremsstrahlung extended to high energies with no evident cutoff energy below 100 keV. Its shape was best described by exp(-E/kTe), where Te is the hot electron temperature. The overall efficiency was equal to approximately 9 X 10-4 for 450 fs pulse and approximately 6 X 10-4 for 150 fs pulses. The x-ray focal spot size was in the range 13 to 50 microns. We have found that the LPP x- ray source with BaF2 and rare-earth targets provide x-ray spectra that might be suitable for DESA.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Andrzej Krol, Jean-Claude Kieffer, Zhiming Jiang, Jianfan Yu, Charles C. Chamberlain, Daniel A. Bassano, and Pascal Gallant "Laser-produced plasma (LPP) x-ray source with BaF2 and rare-earth targets for application in dual-energy subtraction angiography (DESA)", Proc. SPIE 3659, Medical Imaging 1999: Physics of Medical Imaging, (28 May 1999); https://doi.org/10.1117/12.349553
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