Incorporating dark-field information in mesh-based x-ray phase imaging

Pyakurel, Uttam; D'Moore, Desirée; Cheung, Pikting; Kanwal, Bushra; Zhang, Xiaoyun; MacDonald, Carolyn A.; Petruccelli, Jonathan C.

doi:10.1117/12.2582192

Cited by 2 publications

(3 citation statements)

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“…6 When an object is placed in the path of the beam, its attenuation, phase delay and ultra-small angle scatter will change the structure of the mesh harmonics. The high contrast object transmission image, referred to as the TRANS image, is obtained from inverse fast Fourier transforming the windowed normalized central harmonic, 7,8 0…”

Section: Methodsmentioning

confidence: 99%

“…Instead, we have demonstrated simple and effective phase contrast and dark field imaging by using a simple, coarse wire mesh to pattern the beam from a conventional source. 6,7,8 Mesh-based dark field imaging shares similarities with grating interferometry and speckle-based imaging in that all three methods retrieve phase and dark field information by measuring the distortion of a reference pattern on the beam due to the phase shift imparted by object. Talbot interferometers use fine diffraction gratings to produce periodic Talbot patterns on the beam.…”

Section: Introductionmentioning

confidence: 99%

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Dark field signal maximization in mesh-based x-ray imaging

Pyakurel

MacDonald

Petruccelli

2023

Computational Imaging VII

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Small angle x-ray scatter from microstructure too small to resolve in conventional imaging can provide an additional "dark field" signal that is complementary to attenuation and phase. Unfortunately, the low spatial coherence of clinical sources reduces dark field contrast. Focusing polycapillary optics are employed to allow for the use of high-power primary sources by increasing the phase signal after the focus. The method for this system is to structure the beam with a low-cost wire mesh that further relaxes the coherence requirement on the source. However, the coarseness of the mesh reduces the strength of the dark field signal compared with grating-based techniques, so optimization of the signal is important.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dark field signal maximization in mesh-based x-ray imaging

Pyakurel

MacDonald

Petruccelli

2023

Computational Imaging VII

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“…This additional channel of information is directly available by processing the acquired images to quantify the reduction in contrast of the mesh wires. 17 In conventional mammography, overlapping fibroglandular tissue can obscure malignant tissue, causing missed cancers. Similarly, industrial applications can suffer from obscuring features.…”

Section: Introductionmentioning

confidence: 99%

Initial investigation of mesh-based x-ray phase tomography

Allahyani

Pyakurel

Redgate

et al. 2023

Computational Imaging VII

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X-ray phase and dark field imaging offer two additional channels of information to enhance image contrast as well as providing information on material micro-texture that is unavailable to conventional x-ray imaging. These signals are commonly acquired by using multiple precisely aligned, fine-pitched gratings to both pattern the beam and to detect subtle shifts and blurring in this pattern. We instead use a single, low-cost, easily-aligned, coarse-pitched mesh to produce a pattern that is imaged directly to produce phase and dark field computed tomography (CT) images. We demonstrate phase and CT reconstructions using our system for a variety of phantoms.

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Incorporating dark-field information in mesh-based x-ray phase imaging

Cited by 2 publications

References 0 publications

Dark field signal maximization in mesh-based x-ray imaging

Dark field signal maximization in mesh-based x-ray imaging

Initial investigation of mesh-based x-ray phase tomography

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