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KMID : 1038720150260040215
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Progress in Medical Physics
2015 Volume.26 No. 4 p.215 ~ p.222
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Experimental Study for Phase-contrast X-ray Imaging Based on a Single Antiscatter Grid and a Polychromatic X-ray Source
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Park Yeon-ok
Cho Hyo-Sung
Lim Hyun-Woo
Je Ui-kyu
Park Chul-kyu
Cho Hee-moon
Kim Kyu-seok
Kim Gu-na
Park So-young
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Abstract
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In this work, we performed a proof-of-concept experiment for phase-contrast x-ray imaging (PCXI) based on a single antiscatter grid and a polychromatic x-ray source. We established a table-top setup which consists of a focused-linear grid having a strip density of 200 lines/inch, a microfocus x-ray tube having a focal-spot size of about 5 μm, and a CMOS-type flat-panel detector having a pixel size of 48 μm. By using our prototype PCXI system and the Fourier demodulation technique, we successfully obtained attenuation, scattering, and differential phase-contrast images of improved visibility from the raw images of several selected samples at x-ray tube conditions of 90 kVp and 0.1 mAs. Further, fusion image (e.g., the attenuation+the scattering) may have an advantage in displaying details of the sample's structures that are not clearly visible in the conventional attenuation image. Our experimental results indicate that single-grid-based approach seems a useful method for PCXI with great simplicity and minimal requirements on the setup alignment.
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KEYWORD
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Phase-contrast x-ray imaging, Antiscatter grid, Microfocus x-ray tube, Scattering image
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