Sharper dark-field images

Researchers at the

(PSI) and the

in

have developed a method for producing dark-field x-ray images at wavelengths normally used in medical and industrial imaging equipment.

Dark-field images are said to provide more detail than ordinary x-ray radiographs and could be used to diagnose the onset of osteoporosis, breast cancer or Alzheimer’s disease. They can also be used to identify explosives in hand luggage, or to pinpoint hairline cracks or corrosion in functional structures.

Until recently, dark-field x-ray imaging required advanced optics and could only be produced at facilities like the PSI’s synchrotron. With new nanostructured gratings, dark-field images could soon be produced using ordinary x-ray equipment.

Unlike traditional x-ray images, which show a simple absorption contrast, dark-field images capture the scattering of the radiation within the material itself, exposing subtle changes in bone, soft tissue, or alloys. The improved sensitivity in measuring bone density and hairline fractures could help diagnose the onset of osteoporosis. Because cancer or plaque cells scatter radiation slightly differently than normal cells, dark-field x-ray images can also be used to explore soft tissue, providing safer early diagnosis of breast cancer or the plaques associated with Alzheimer’s disease.