| Recent
Advances in Medical Applications of Synchrotron Radiation Stanford Synchrotron Radiation Laboratory March 4-5, 2002 Program Director: Edward Rubenstein |
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Dark
Field Imaging
Masami Ando1,2,† 2Department of Photo-Science, School of Advanced Studies, GUAS, Hayama, Miura, Kanagawa 240-0193, Japan; † masami.ando@kek.jp |
We report
an X ray optical syste
m "Owl," capable of dark field imaging which
is available by a drawing shown below. It is comprised of a Bragg
case asymmetric monochromator and a monolithic X-ray optics housing
a collimator C and an analyzer A that can select only the refracted
light by 4,4,0 diffraction and the crystals C and A with 1.08 mm thickness.
The angular width of diffraction is 0.3 µrad at X-ray energy
of 35keV. It has been proven that one c
an obtain a forward diffracted
beam which corresponds to the dark field imaging and the other a diffracted
one corresponding to the bright field or vice versa depending on the
specified thickness of the analyzer. Images due to refraction contrast
in the dark field are clearly shown. In this report design and test
of this X-ray optics will be described in detail. For demonstration
of its application a variety of samples have
been attempted: a dried
phalanx, human auditory ossicles and a mammographic phantom. Visual
observation was performed with spatial resolution of approximately
30 µm or better. Exposure time for each picture was approximately
1-2 min. Acknowledgement This work has been don e under the approval of the Program Advisory Committee for experiment at BL20B (2001A0198-CL-np), at BL24XU (C01A5054N) at SPring-8 and at BL14B (2000G036) at Photon Factory. We acknowledge KEK and GUAS for research fund KEK/2001-22 and Soken/K01-5 in 2001, respectively. Collaboration Kazuyuki Hyodo, Anton Maksimenko, Vladimir Nedoresov, Wanwisa Pattanasiriwisawa, Joseph Roberson, Edwa rd Rubenstein, Hiroshi Sugiyama, Ei Ueno References [1] Ando M., Sugiyama H., Maksimenko A., Pattansiriwisawa W., Hyodo K. & Zhang X. (2001). Jpn. J. Appl. Phys. 40, L844-L846. [2] Ando M., Roberson J., Rubenstein E., Pattanasiriwisawa W., Maksimenko A., Sugiyama H. & Hyodo K. (2001). Proceedings of JSBB, Yamagata, in press. [3] Pattan asiriwisawa W., Maksimenko A., Sugiyama H., Hyodo K. & Ando M. (2001). Proceedings of JSBB, Yamagata, in press. [4] Ando M, Hyodo K, Sugiyama H, Maksimenko A, Pattanasiriwisawa W, Roberson J, Rubenstein E, Tanaka, (2002). Jpn. J. Appl. Phys. in press. |
