Attenuation map estimation without transmission scanning using measured scatter data

Cade, Sarah C.; Arridge, Simon; Evans, M.; Hutton, Brian F.

doi:10.1109/nssmic.2011.6155246

Cited by 4 publications

(3 citation statements)

References 15 publications

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“…Perhaps the most obvious of these is that the current model uses only photons that have been scattered once, which cannot be isolated in the real situation. However, we have previously shown 13 that provided the magnitude of the contribution of higher order scatter events is estimated with reasonable accuracy the precise distribution is not crucial. As a result, although the behavior of the approach in the presence of multiple scatter is not known, it is likely that this will not represent a significant limitation.…”

Section: Discussionmentioning

confidence: 99%

Use of measured scatter data for the attenuation correction of single photon emission tomography without transmission scanning

et al. 2013

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Section: Discussionmentioning

confidence: 99%

Use of measured scatter data for the attenuation correction of single photon emission tomography without transmission scanning

et al. 2013

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“…In order to make this new bimodal con cept realistic, an attenuation factor is taken into account in this pa per for both transmission and emission modalities. [13] deals with the attenuation correction in SPECT using scattered data. Here our imaging system is aimed to reconstruct the heterogeneous electron density and solve the attenuation problem in emission modality from the estimation of the electron density by a transmission CST modal ity which appears to be new.…”

Section: Discussionmentioning

confidence: 99%

New bimodal scattered radiation tomographic imaging with attenuation and electron density correction algorithm

Rigaud

Régnier

Nguyen

2013

2013 IEEE International Conference on Acoustics, Speech and Signal Processing

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Bimodal medical imaging, which combines two non-invasive tech niques to explore two different aspects (e.g. function and morphol ogy) of an organ, has emerged as a major clinical imaging modality nowadays. The gained information as compared to single modality imaging is overwhelmingly useful for diagnostics and therapy plan ning. Up to now all bimodal techniques make use exclusively of primary radiation. In this work, we describe a new bimodal imaging concept based solely on the exploitation of scattered radiation. Fol lowing a presentation of its theoretical basis, we discuss the mod elings of measurements and inversion formulae used for image re construction. Thus an attenuation and electron density correction algorithm inspired of the Iterative Pre-Correction algorithm (IPC) is proposed. Simulation results demonstrate convincingly the feasibil ity and efficiency of this new bimodal imaging modality.

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“…9, 23 This method works well when activity is widely distributed, 24–28 but it has limitations when the activity is focal. 2 There are also some preliminary studies on estimating the attenuation map by inverting the models used to correct for scatter, 29, 30 but the methods are still slow.…”

Section: Introductionmentioning

confidence: 99%

Joint reconstruction of activity and attenuation map using LM SPECT emission data

Jha

Clarkson

Kupinski

et al. 2013

Medical Imaging 2013: Physics of Medical Imaging

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Attenuation and scatter correction in single photon emission computed tomography (SPECT) imaging often requires a computed tomography (CT) scan to compute the attenuation map of the patient. This results in increased radiation dose for the patient, and also has other disadvantages such as increased costs and hardware complexity. Attenuation in SPECT is a direct consequence of Compton scattering, and therefore, if the scattered photon data can give information about the attenuation map, then the CT scan may not be required. In this paper, we investigate the possibility of joint reconstruction of the activity and attenuation map using list-mode (LM) SPECT emission data, including the scattered-photon data. We propose a path-based formalism to process scattered-photon data. Following this, we derive analytic expressions to compute the Cramér-Rao bound (CRB) of the activity and attenuation map estimates, using which, we can explore the fundamental limit of information-retrieval capacity from LM SPECT emission data. We then suggest a maximum-likelihood (ML) scheme that uses the LM emission data to jointly reconstruct the activity and attenuation map. We also propose an expectation-maximization (EM) algorithm to compute the ML solution.

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Attenuation map estimation without transmission scanning using measured scatter data

Cited by 4 publications

References 15 publications

Use of measured scatter data for the attenuation correction of single photon emission tomography without transmission scanning

Use of measured scatter data for the attenuation correction of single photon emission tomography without transmission scanning

New bimodal scattered radiation tomographic imaging with attenuation and electron density correction algorithm

Joint reconstruction of activity and attenuation map using LM SPECT emission data

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