Small-field imaging properties of narrow energy band X-ray beams for mammography

1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record Pub Date : 1995-10-21 DOI:10.1109/NSSMIC.1995.500261

M. Gambaccini, A. Taibi, A. Del Guerra, F. Frontera

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引用次数: 14

Abstract

X-ray imaging with low-energy, narrow-band, and tunable radiation offers the possibility of reducing dose and improving image contrast. We investigate the production of narrow energy band X-ray beams with a standard X-ray tube by using Bragg diffraction on mosaic crystals for mammography application. Quasi-monochromatic X-ray beams (/spl Delta/E/E/spl sim/0.1) have been produced in the mammography energy range. Small-field (1.1/spl times/3.0 cm/sup 2/) radiographs of a plexiglas phantom 3.6 cm thick were obtained with 18, 20, and 22 keV quasi-monochromatic beams and a conventional film/screen combination for mammography. Images showed a nonuniformity in the irradiation field. A digital detector was used as imaging system to correct the phantom radiographs for this uneven illumination across the image. The overall contrast of the images decreases with increasing energy of the beam from 18 keV to 22 keV. A measurement of the resolving power of the reflected beam has shown an asymmetric unsharpness along the two dimensions of the image plane. The actual focal spot has a size of about 0.2/spl times/0.05 cm/sup 2/.

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窄能带x射线束乳腺x线造影的小场成像特性

低能量、窄带和可调辐射的x射线成像提供了减少剂量和提高图像对比度的可能性。我们研究了在标准x射线管上利用马赛克晶体的布拉格衍射产生窄能带x射线束。准单色x射线束(/spl Delta/E/E/spl sim/0.1)已在乳房x线造影能量范围内产生。采用18、20和22 keV准单色光束和传统的胶片/屏幕组合进行乳房x线摄影，获得3.6 cm厚有机玻璃模体的小视场(1.1/spl倍/3.0 cm/sup 2/) x线照片。图像显示辐照场不均匀。一个数字探测器被用作成像系统，以纠正幻影射线片的这种不均匀的照明在整个图像。随着光束能量从18kev增加到22kev，图像的整体对比度降低。对反射光束的分辨能力的测量表明，在成像平面的两个维度上存在不对称的不锐度。实际焦斑的大小约为0.2/倍/0.05 cm/sup /。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record

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