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Imagerie de phase quantitative par interférométrie à décalage quadri-latéral. Application au domaine des rayons x durs

Abstract : Since Röntgen discovered X-rays, X-ray imaging systems are based on absorption contrast. This technique is inefficient for weakly absorbing objects. As a result, X-ray standard radiography can detect bones lesions, but cannot detect ligament lesions.However, phase contrast imaging can overcome this limitation. Since the years 2000, relying on former works of opticians, X-ray scientists are developing phase sensitive devices compatible with industrial applications such as medical imaging or non destructive control.Standard architectures for interferometry are challenging to implement in the X-ray domain.This is the reason why grating based interferometers became the most promising devices to envision industrial applications. They provided the first x-ray phase contrast images of living human samples.Nevertheless, actual grating based architectures require the use of at least two gratings, and are challenging to adapt on an industrial product. So, the aim of my thesis was to develop a single phase grating interferometer. I demonstrated that such a device can provide achromatic and propagation invariant interference patterns. I used this interferometer to perform quantitative phase contrast imaging of a biological fossil sample and x-ray flat mirror metrology.
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Submitted on : Thursday, December 12, 2013 - 9:52:11 AM
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Julien Rizzi. Imagerie de phase quantitative par interférométrie à décalage quadri-latéral. Application au domaine des rayons x durs. Autre [cond-mat.other]. Université Paris Sud - Paris XI, 2013. Français. ⟨NNT : 2013PA112248⟩. ⟨tel-00917590⟩

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