Novel approach to stationary transmission scanning using Compton scattered radiation

Nguyen, Maï K.; Truong, T.T.; Delarbre, J.-L.; Roux, C.; Zaidi, Habib

doi:10.1088/0031-9155/52/15/017

Cited by 7 publications

(8 citation statements)

References 26 publications

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“…Numerical simulations have demonstrated the feasibility of this new imaging principle [24]. Issues related to higher order scattering contribution, nonuniform attenuation, Poisson emission noise, detection sensitivity, collimator efficiency are part of ongoing research with innovative extensions to transmission imaging, leading eventually to an efficient dual-modality imaging procedure [25].…”

Section: Point Spread Function and Results Of Simulationsmentioning

confidence: 99%

“…We have recently advocated a new functional modality following the principle of emission imaging by scattered gamma-rays without mechanical collimation [25], [26]. Removing the collimator from the detector allows gamma rays to reach a detecting pixel from all directions coming from the upper-half space of this site, therefore increasing the strength of the signal (Fig.…”

Section: How To Increase Sensitivity?mentioning

confidence: 99%

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On a Novel Approach to Compton Scattered Emission Imaging

Nguyen¹,

Truong²,

Driol³

et al. 2009

IEEE Trans. Nucl. Sci.

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Abstract-Imaging processes built on the Compton scattering effect are currently under intense investigation. However, despite many innovative contributions, this topic still pose a formidable mathematical and technical challenge. In this work, we argue that, in the framework of single-photon emission imaging, collecting Compton scattered radiation from an emitting object, allows to image the radiotracer distribution in vivo. Data is acquired by a stationary collimated gamma camera under the form of compounded conical projections of the activity density function. Mathematically, the image formation process is described by the so-called Compounded Conical Radon Transform (CCRT) and three-dimensional object reconstruction is based on an inversion formula of the CCRT. We perform numerical simulations to show the feasibility of this new imaging modality, which offers the remarkable advantage of operating in stationary mode without the need of bulky and cumbersome spatial rotational mechanism of conventional gamma cameras. This is highly attractive for applications in medical imaging, industrial non-destructive evaluation, nuclear waste storage surveillance and homeland security monitoring. Finally, to improve drastically the sensitivity, we introduce a new feature allowing to acquire data without mechanical collimation and support the findings with some preliminary simulation results.

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Section: Point Spread Function and Results Of Simulationsmentioning

confidence: 99%

Section: How To Increase Sensitivity?mentioning

confidence: 99%

On a Novel Approach to Compton Scattered Emission Imaging

Nguyen¹,

Truong²,

Driol³

et al. 2009

IEEE Trans. Nucl. Sci.

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“…Arguments showing the convergence of this iterative procedure are given in [16], as well as geometric limitations in real situations. To confirm the working we present simulations on medical phantoms under the following conditions.…”

Section: Simulations Resultsmentioning

confidence: 99%

On the concept of scattered gamma-ray imaging and corresponding generalized Radon transforms

Nguyen

Truong

2009

ESAIM: Proc.

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Abstract. This paper reviews the concept of gamma-ray imaging based on Compton scattered radiation introduced some years ago. We describe its mathematical supporting structure of generalized Radon transforms and point out its main advantages in view of applications in nuclear medicine, industrial non-destructive evaluation, nuclear waste surveillance and fissile materials transportation monitoring. Some possible generalizations are mentioned as future research topics.Résumé. Dans cet article, nous présentons le concept d'imagerie gamma basée sur le rayonnement diffusé par effet Compton, qui aété introduit quelques années auparavant. Nous exposons la structure mathématique des transformations de Radon généralisées sous-jacente et passons en revue ses propriétés avantageuses en vue d' applications en médecine nucléaire, contrôle non-destructif industriel, surveillance des dépôts de déchets radioactifs et contrôle du transport des matériaux fissiles. Quelques généralisations de ce concept sont susceptibles de recherche future.

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“…Performed numerical simulations are in favor of the feasibility of this new imaging principle [35]. However issues related to higher-order scattering contribution, nonuniform attenuation, Poisson emission noise, detection sensitivity, and collimator efficiency are to be resolved before interesting practical modalities with possible combination with transmission imaging can be proposed [37]. …”

Section: Compton-scattered Radiation Imaging In Three Dimensionsmentioning

confidence: 99%

Scattered Radiation Emission Imaging: Principles and Applications

Nguyen

Truong

Morvidone

et al. 2011

International Journal of Biomedical Imaging

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Imaging processes built on the Compton scattering effect have been under continuing investigation since it was first suggested in the 50s. However, despite many innovative contributions, there are still formidable theoretical and technical challenges to overcome. In this paper, we review the state-of-the-art principles of the so-called scattered radiation emission imaging. Basically, it consists of using the cleverly collected scattered radiation from a radiating object to reconstruct its inner structure. Image formation is based on the mathematical concept of compounded conical projection. It entails a Radon transform defined on circular cone surfaces in order to express the scattered radiation flux density on a detecting pixel. We discuss in particular invertible cases of such conical Radon transforms which form a mathematical basis for image reconstruction methods. Numerical simulations performed in two and three space dimensions speak in favor of the viability of this imaging principle and its potential applications in various fields.

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Novel approach to stationary transmission scanning using Compton scattered radiation

Cited by 7 publications

References 26 publications

On a Novel Approach to Compton Scattered Emission Imaging

On a Novel Approach to Compton Scattered Emission Imaging

On the concept of scattered gamma-ray imaging and corresponding generalized Radon transforms

Scattered Radiation Emission Imaging: Principles and Applications

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