Conference Paper

Three-Dimensional Object Reconstruction from Compton Scattered Gamma-Ray Data.

DOI: 10.1007/978-3-540-27816-0_3 Conference: Computer Vision and Mathematical Methods in Medical and Biomedical Image Analysis, ECCV 2004 Workshops CVAMIA and MMBIA, Prague, Czech Republic, May 15, 2004, Revised Selected Papers
Source: DBLP

ABSTRACT A new imaging principle for object reconstruction is proposed in Single Photon Emission Computer Tomography (SPECT) which
is widely used in nuclear medicine. The quality of SPECT images is largely affected by many adverse factors among which chiefly
Compton scattering of gamma rays. Recently we have proposed to exploit Compton scattered radiation to generate new data necessary for object reconstruction, instead of discarding it as usually done. This has led us to a new underlying imaging
principle based on the inversion of a generalized Radon transform. In this new three-dimensional reconstruction method both
signal to noise ratio and image quality are improved. Remarkably the complete data, collected at various angles of scattering, can be obtained by a motionless data taking gamma camera. Examples of object reconstruction are presented as illustrations.

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    ABSTRACT: A new modality in gamma-ray emission imaging, based on the use of scattered radiation detected with an uncollimated gamma camera, is put forward. Recently, we have shown that scattered radiation by Compton effect registered on a collimated gamma camera can be in principle used to reconstruct an object in three dimensions. To improve drastically the sensitivity of this process, we propose that data acquisition should be performed without mechanical collimation. As a first step, image formation in two dimensions is derived and validated by Monte Carlo simulations. Then, numerical reconstructions are presented to support the feasibility and attractiveness of this new concept.
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    ABSTRACT: Conventional tomography (X-ray scanner, Computed Tomography : CT, Single Photon Emission CT : SPECT,...) is widely used in numerous fields such as medical imaging and non-destructive testing. In theses tomographies, a detector rotates in space to collect primary radiation emitted by an object under investigation. In this case Compton scattered radiation behaves as noise hindering image quality and consequently correction to scatter should be applied. However recently an interesting new imaging concept, which uses precisely scattered radiation as imaging agent, has been advocated. The camera records now images labeled by scattered photon energy or equivalently scattering angle. Then it is shown that the three dimensional image reconstruction from scattered radiation data is feasible [1, 2, 3, 4, 5]. In this work we propose a new form of Compton scattering tomography (CST), akin to the X-ray scanning tomography, in the sense that it works in transmission but uses Compton scattered radiation. The new image formation modeling is based on a new class of Radon transforms on circular arcs. Through simulation results we show the feasibility and the relevance of this new process.
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    ABSTRACT: This paper presents a new dual-modality imaging principle using two recent results. The first one demonstrates the feasibility of reconstruction of a radioactive distribution from its Compton-scattered radiation. This may be regarded as a novel gamma-ray emission imaging principle. The second one shows the possibility to reconstruct the electronic density of a medium and its attenuation map from other Compton-scattered radiation emitted by an external gamma source and scattered in the medium. The required data for the two reconstructions are easily acquired from an energy and space measuring gamma camera under the form of scattered distribution images classified by their Compton-scattering angle. The usual motion of camera is no longer necessary and so all images needed for a three-dimensional reconstruction are recorded simultaneously. For non-immobile object, this is a decisive advantage
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