Towards a new concept for high sensitivity Compton scatter emission imaging

Nguyen, Maï K.; Driol, C.; Truong, T.T.; Zaidi, Habib

doi:10.2971/jeos.2008.08010

Cited by 4 publications

(3 citation statements)

References 19 publications

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“…The original objet is a square formed by 12 points in the middle of the scattering square medium. The most laborious task is the computation of the "weight" matrix in this numerical inversion procedure for implementation of the conjugate gradient reconstruction technique [7], [8]. The results are presented in Fig.…”

Section: A the Two-dimensional Casementioning

confidence: 87%

Effect of Energy Resolution in Compton Scattered Radiation Imaging

Nguyen

Delarbre

Truong³

et al. 2008

2008 IEEE Nuclear Science Symposium Conference Record

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Abstract-Recently emission imaging exploiting Compton scattered radiation has been shown to be a feasible three-dimensional imaging modality, in particular for medical imaging. It exhibits several advantageous features among which the possibility of acquiring data using a stationary detector, instead of a moving one as in standard emission tomography imaging modalities. But measurements of scattered photons require high energy resolution detectors. Nowadays progress in detector technology allows to reach higher and higher energy resolution [1]- [3]. In this work, we consider the effect on image reconstruction of the finite energy resolution ∆E of a realistic collimated gamma camera. Approximate reconstruction methods are used to evaluate the image quality of the reconstructed object. It was observed that when ∆E is very small, the relative mean quadratic error is rather stable with respect to increasing values of n, the number of energy channels detected, but it becomes fluctuating as ∆E gets larger and larger. Conversely for given n, the relative mean quadratic error increases with ∆E. Results obtained using a simple phantom are also presented for various values of n and ∆E.

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Section: A the Two-dimensional Casementioning

confidence: 87%

Effect of Energy Resolution in Compton Scattered Radiation Imaging

Nguyen

Delarbre

Truong³

et al. 2008

2008 IEEE Nuclear Science Symposium Conference Record

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“…9). An introductory study in two dimensions has recently been performed [27] to demonstrate conclusively the feasibility of this idea and to motivate the present work.…”

Section: How To Increase Sensitivity?mentioning

confidence: 91%

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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“…Removing the collimator from the detector allows more 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 ( Figure 10 ). An introductory study in two dimensions has recently been performed [ 39 ] to show convincingly the viability of this idea and to motivate the present work.…”

Section: Compton-scattered Radiation Imaging In Three Dimensionsmentioning

confidence: 94%

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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Towards a new concept for high sensitivity Compton scatter emission imaging

Cited by 4 publications

References 19 publications

Effect of Energy Resolution in Compton Scattered Radiation Imaging

Effect of Energy Resolution in Compton Scattered Radiation Imaging

On a Novel Approach to Compton Scattered Emission Imaging

Scattered Radiation Emission Imaging: Principles and Applications

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