1 February 1991 Multilayer monochromator for synchrotron radiation angiography
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Abstract
We have investigated the properties of small period multilayers as possible diffracting elements in a monochromator for synchrotron radiation angiography. This type of angiography uses two photon beams, tuned above and below the iodine K-edge (33 KeV) resp., to image an iodine contrast agent injected into the coronary circulation. The fine energy resolution of the perfect Si(1 1 1) Bragg reflectors now used is not necessary and severely limits the useful flux from the synchrotron. We report measurements showing that an increase in flux of nearly 2 orders of magnitude times that of Si may be obtained by using small period (20 to 27 A) W/C or W/B C multilayers. However, the background in the angiogram due to bone and tissue increases as the energy difference between the two beams goes up, and therefore as the bandpass increases. Additional work is needed to determine the maximum allowable bandpass.
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Alfred Q. R. Baron, Alfred Q. R. Baron, Troy W. Barbee, Troy W. Barbee, George S. Brown, George S. Brown, } "Multilayer monochromator for synchrotron radiation angiography", Proc. SPIE 1343, X-Ray/EUV Optics for Astronomy, Microscopy, Polarimetry, and Projection Lithography, (1 February 1991); doi: 10.1117/12.23232; https://doi.org/10.1117/12.23232
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