Abstract
Compared to conventional attenuation x-ray radiographic imaging, the x-ray Talbot-Lau technique provides further information about the scattering and the refractive properties of the object in the beam path. Hence, this additional information should improve the diagnostic process concerning medical applications and non-destructive testing. Nevertheless, until now, due to grating fabrication process, Talbot-Lau imaging suffers from small grating sizes (70 mm diameter). This leads to long acquisition times for imaging large objects. Stitching the gratings is one solution. Another one consists of scanning Talbot-Lau setups. In this publication, we present a compact and very fast scanning setup which enables imaging of large samples. With this setup a maximal scanning velocity of 71.7 mm/s is possible. A resolution of 4.1 lines/mm can be achieved. No complex alignment procedures are necessary while the field of view comprises 17.5 × 150 cm2. An improved reconstruction algorithm concerning the scanning approach, which increases robustness with respect to mechanical instabilities, has been developed and is presented. The resolution of the setup in dependence of the scanning velocity is evaluated. The setup imaging qualities are demonstrated using a human knee ex-vivo as an example for a high absorbing human sample.
Highlights
Conventional x-ray attenuation radiography and tomography is the gold standard for several detection tasks in medical imaging and non destructive testing
We examine the quality of imaging with a scanning velocity of 71.7 mm/s which corresponds to a dose of about 43 μGy air kerma
The resolution of the scanning system is evaluated in dependence of the scanning velocity
Summary
Conventional x-ray attenuation radiography and tomography is the gold standard for several detection tasks in medical imaging and non destructive testing. The grating interferometric methods (Talbot-Lau imaging) and the grating non-interferometric methods (edge illumination) have shown promising results in medical imaging[24,25,26,27,28,29,30] and non-destructive testing[31,32,33,34,35,36,37]. These two techniques could be operated using conventional x-ray sources[17,19], which gives the opportunity to be adopted in clinics and industrial test facilities. To bring x-ray phase-contrast imaging to clinics and non-destructive testing workflows, a highly stable system with a large field of view and a fast acquisition time has to be available
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