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16 Nov 1998

Volume 73, Issue 20, pp. 2857-3009

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Time-gated x-ray tomography

M. Grätz, L. Kiernan, C.-G. Wahlström, S. Svanberg, and K. Herrlin

Appl. Phys. Lett. 73, 2899 (1998); http://dx.doi.org/10.1063/1.122623 (3 pages) | Cited 3 times

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Time-gated x-ray tomography with scatter reduction is demonstrated using a laser-produced plasma as an ultrashort-pulse x-ray source in combination with a time-resolving streak-camera detector. Backprojections of a phantom imbedded in 9 cm of water show an effective 50% increase in contrast when scattered x-ray quanta (being delayed in time) are suppressed by gating on the prompt, nonscattered photons. Implications for future volumetric tomography, in particular concerning possible dose reductions, are discussed. © 1998 American Institute of Physics.
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87.59.bd Computed radiography
07.85.Fv X- and γ-ray sources, mirrors, gratings, and detectors
52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
52.25.Os Emission, absorption, and scattering of electromagnetic radiation

Guiding characteristics of an acoustic standing wave in a piezoelectric tube

C. M. Fauser, E. W. Gaul, S. P. Le Blanc, and M. C. Downer

Appl. Phys. Lett. 73, 2902 (1998); http://dx.doi.org/10.1063/1.122624 (3 pages) | Cited 2 times

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Propagation of an He–Ne laser beam through a gas filled piezoelectric tube is used to characterize the guiding properties of a radially driven acoustic standing wave. Impedance matched driving at 1 MHz of the 5-cm-long piezotube yields radial density perturbations of 0.005 at 40 V driving voltage. The frequency spectrum of the cavity resonances is used to measure the damping of the standing wave due to shear viscosity in Ar. © 1998 American Institute of Physics.
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43.20.Mv Waveguides, wave propagation in tubes and ducts
52.38.-r Laser-plasma interactions
42.79.Jq Acousto-optical devices
42.79.Gn Optical waveguides and couplers
52.40.Fd Plasma interactions with antennas; plasma-filled waveguides
42.60.Jf Beam characteristics: profile, intensity, and power; spatial pattern formation
85.50.-n Dielectric, ferroelectric, and piezoelectric devices
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