Laminographic Reconstruction from Real-Time Radiographic Images

Barker, M.

doi:10.1007/978-1-4613-0817-1_58

Cited by 7 publications

(4 citation statements)

References 2 publications

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“…In contrast to FBP algorithms, iterative reconstruction techniques do not require modification to be applicable to laminar reconstruction, whether the scan trajectory leads to varying or constant magnification. In theory, all that is required is the specification of the appropriate system matrix that describes the laminar measurement geometry, and indeed these algorithms have been applied to laminographic reconstructions since the late 1980s [7]. Many iterative methods are broadly classed as algebraic techniques, although an iterative version of the classically non-iterative filtered backprojection algorithm has also been developed to reconstruct laminographic differential phase measurements [37].…”

Section: Iterative Reconstruction Techniquesmentioning

confidence: 99%

Recent Advances in X-ray Cone-beam Computed Laminography

O'Brien

Boardman

Sinclair

et al. 2016

XST

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X-ray computed tomography is an established volume imaging technique used routinely in medical diagnosis, industrial non-destructive testing, and a wide range of scientific fields. Traditionally, computed tomography uses scanning geometries with a single axis of rotation together with reconstruction algorithms specifically designed for this setup. Recently there has however been increasing interest in more complex scanning geometries. These include so called X-ray computed laminography systems capable of imaging specimens with large lateral dimensions or large aspect ratios, neither of which are well suited to conventional CT scanning procedures. Developments throughout this field have thus been rapid, including the introduction of novel system trajectories, the application and refinement of various reconstruction methods, and the use of recently developed computational hardware and software techniques to accelerate reconstruction times. Here we examine the advances made in the last several years and consider their impact on the state of the art.

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Section: Iterative Reconstruction Techniquesmentioning

confidence: 99%

Recent Advances in X-ray Cone-beam Computed Laminography

O'Brien

Boardman

Sinclair

et al. 2016

XST

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“…The favorable conditions are: (1) between the planes of the tomograms; and (2) similarity between the shape of the objects on adjacent planes. For example, the plantom used in the simulations in (3) has a spacing between the planes equal to 10 times the pixel size, and the pinstripe patterns are rotated by only 22S from one plane to the next.…”

Section: \ \ Imentioning

confidence: 99%

“…The method of tomography was modified and applied to the x-ray imaging of multilayered structures under the name of digital tomography (DT) or laminography (1,2,3]. In this paper it is shown that digital tomography is basically a limited-angle imaging problem.…”

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confidence: 99%

Digital Tomography Incorporating a Priori Information

Tam¹,

Thomas²

1990

Review of Progress in Quantitative Nondestructive Evaluation

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The technique of tomography has long been used in radiography and in nuclear medicine to sharpen images of objects on the tomographic plane and to blur images of objects on the off-planes. The method is illustrated in Figure 1. Suppose one is interested in examining the plane Tin the object. The x-ray source and the film are moved parallel to each other in the opposite directions with the plane of interest as the fulcrum. This is achieved by choosing the velocity v1 of the x-ray source and the velocity v 2 of the film such that the ratio v1/v2 is equal to difd 2 , where d 1 is the source-to-plane distance, and d 2 is the plane-to-film distance. The objects on the plane of interest are in focus, whereas the objects on the other planes are out of focus and blurred. However, the blurrings could become quite serious in some cases and interfere with the objects of interest.

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“…Modern laminography [1,2] for NDE involves taking several digital radiographs of an object at different angles and then backprojecting the digital radiographs to form a three-dimensional image.…”

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confidence: 99%