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A monochromator has been developed for coronary angiography, comprising a single bent crystal of silicon in Laue transmission geometry. K spectra of laser irradiated solid tin and tantalum (Z=50 and 73, respectively) targets were measured. The high resolution crystal spectrometer resolve the Sn and Ta K alpha doublets, allowing in a proof-of-principle experiment the absolute K alpha photon numbers emitted by the source to be determined. The Ta K alpha yield is measured as a function of the laser pulse energy, allowing an assessment to be made of the suitability of such sources for medical applications. (C) 2001 American Institute of Physics

Coronary angiography using laser plasma sources: X-ray source efficiency and optimization of a bent crystal monochromator