Development of phase sensitive radiography for human imaging by means of synchrotron radiation

点击翻译按钮获取中文摘要

Refraction contrast imaging of the fine structures of the ribs of a pig and a specimen of human osteosarcoma utilizing the spatial coherence of synchrotron X-rays was successfully performed with an incident X-ray energy of 30 keV at KEK.PF and SPring-8. The image contrast appearing at the periphery of trabecular bone, small calcification and small fractures is caused by the phase shift of the X-rays at the boundary of these objects that have different X-ray refractive indices. The image was recorded on mammography film without an intensifying screen. Comparison of the image contrast using different sample-to-film distances, Z, such as Z=5 m and Z=0 m, showed that the former images were always more informative, i.e. better in resolution and /or image contrast when imaging of trabecular bone, bone marrow and small fractures in compact bone, and for imaging of cartilage.Refraction contrast imaging of a pig head with penetration of wooden foreign body in his oral cavity utilizing the spatial coherence of synchrotron X-rays was successfully performed with an incident X-ray energy of 35 keV at BL20B2 of SPring-8. The image was recorded on mammography film with an intensifying screen. Comparison of the image contrast using different sample-to-film distances such as Z=5 m and Z=0 m, showed that the former images were always more informative, i.e. the wooden foreign body could be detected only by the refraction contrast imaging.Radiography using synchrotron X-rays for phase objects should be a powerful tool for diagnosis in orthopedics and wooden foreign body imaging.