Spot size measurement of a flash-radiography source using the pinhole imaging method

Wang, Yi; 李勤,; 陈楠,; 程晋明,; 谢宇彤,; 刘云龙,; 龙全红,

doi:10.1088/1674-1137/40/7/076202

Cited by 4 publications

(2 citation statements)

References 6 publications

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“…In this case, the X-ray source dynamics depends on the radiation transport process, plasma process, and hydrodynamics of the target. The observation technique is based on projecting the X-ray flux from the target onto a scintillator using a pinhole camera or the roll-bar (knife edge) technique [13], [14]. There are several approaches to recording the dynamics of the scintillator glow.…”

Section: Introductionmentioning

confidence: 99%

Observation of the Dynamics of a Focal Spot Using a Long-Pulse Linear Induction Accelerator

Trunev

Skovorodin

Бурдаков

et al. 2020

IEEE Trans. Plasma Sci.

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A diagnostic has been developed to study the focusing dynamics of a high-power electron beam on a target. The diagnostic uses a pinhole camera to observe bremsstrahlung from the converter target. A data acquisition system yields images of the beam focal spot with a frame duration of 20 ns and an almost unlimited recording duration. The focal spot dynamics of a linear induction accelerator with an energy of 1.5 MeV, a current of 1.2 kA and a pulse duration of 350 ns were studied. The focal spot was found to be disrupted within the first 100 ns of the pulse. Defocusing has a complex 3-D character. The feasibility of additional cleaning of the target using an accelerator pre-pulse was shown. Stable beam focusing for up to 200 ns was demonstrated.

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Section: Introductionmentioning

confidence: 99%

Observation of the Dynamics of a Focal Spot Using a Long-Pulse Linear Induction Accelerator

Trunev

Skovorodin

Бурдаков

et al. 2020

IEEE Trans. Plasma Sci.

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“…Radiographic image tomography is an inverse problem with enormous impact on applications, and it still offers a wealth of mathematical task driven by concrete, practical issues. In this paper, we focus on an important case, Abel inversion tomography (AIT) in hydrodynamic tests, where pulsed radiography (PR) is utilized to study the behavior of dense, shock driven materials, or determine the major densification of an object [2,13,45,46,47,94]. This type of radiography is characterized by high-energy radiation source, few (one or two) penetrating angles and limited or localized field of view, very heavy attenuation by the object and explosive shielding, and very brief pulse duration [13].…”

mentioning

confidence: 99%

A variational method for Abel inversion tomography with mixed Poisson-Laplace-Gaussian noise

Kong

Wei

2022

IPI

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<p style='text-indent:20px;'>Abel inversion tomography plays an important role in dynamic experiments, while most known studies are started with a single Gaussian assumption. This paper proposes a mixed Poisson-Laplace-Gaussian distribution to characterize the noise in charge-coupled-device (CCD) sensed radiographic data, and develops a multi-convex optimization model to address the reconstruction problem. The proposed model is derived by incorporating varying amplitude Gaussian approximation and expectation maximization algorithm into an infimal convolution process. To solve it numerically, variable splitting and augmented Lagrangian method are integrated into a block coordinate descent framework, in which anisotropic diffusion and additive operator splitting are employed to gain edge preserving and computation efficiency. Supplementarily, a space of functions of adaptive bounded Hessian is introduced to prove the existence and uniqueness of solution to a higher-order regularized, quadratic subproblem. Moreover, a simplified algorithm with higher order regularizer is derived for Poisson noise removal. To illustrate the performance of the proposed algorithms, numerical tests on synthesized and real digital data are performed.</p>

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Size characterization of x-ray tube source with sphere encoded imaging method

Yu,

Li,

Dai

et al. 2024

Review of Scientific Instruments

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In x-ray imaging, the size of the x-ray tube light source significantly impacts image quality. However, existing methods for characterizing the size of the x-ray tube light source do not meet measurement requirements due to limitations in processing accuracy and mechanical precision. In this study, we introduce a novel method for accurately characterizing the size of the x-ray tube light source using spherical encoded imaging technology. This method effectively mitigates blurring caused by system tilting, making system alignment and assembly more manageable. We employ the Richardson–Lucy algorithm to iteratively deconvolve the image and recover spatial information about the x-ray tube source. Unlike traditional coded imaging methods, spherical coded imaging employs high-Z material spheres as coding elements, replacing the coded holes used in traditional approaches. This innovation effectively mitigates blurring caused by system tilting, making system alignment and assembly more manageable. In addition, the mean square error is reduced to 0.008. Our results demonstrate that spherical encoded imaging technology accurately characterizes the size of the x-ray tube light source. This method holds significant promise for enhancing image quality in x-ray imaging.

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Spot size measurement of a flash-radiography source using the pinhole imaging method

Cited by 4 publications

References 6 publications

Observation of the Dynamics of a Focal Spot Using a Long-Pulse Linear Induction Accelerator

Observation of the Dynamics of a Focal Spot Using a Long-Pulse Linear Induction Accelerator

A variational method for Abel inversion tomography with mixed Poisson-Laplace-Gaussian noise

Size characterization of x-ray tube source with sphere encoded imaging method

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