Material Separation with Dual-Layer CT

Carmi, Raz; Naveh, Galit; Altman, Ami

doi:10.1109/nssmic.2005.1596697

Cited by 82 publications

(71 citation statements)

References 4 publications

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“…There are a few common methods of obtaining dual-energy spectral CT data: sequential dual scanning, simultaneous dual-source scanning, the single-source dual-detector layer technique, and the rapid switching technique. Photon-counting detectors have also been used ( 5,(20)(21)(22).…”

Section: Genitourinary Imaging: Dual-energy Ct Determination Of Renalmentioning

confidence: 99%

“…In the current study, we used a singlesource dual-detector layer scanner confi guration, in which a single x-ray tube is used to expose two layered arrays of detectors mounted in the gantry, one above the other ( 21 ). The inner layer absorbs lower-energy photons, and the outer layer absorbs the higher-energy photons.…”

Section: Genitourinary Imaging: Dual-energy Ct Determination Of Renalmentioning

confidence: 99%

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Determination of Renal Stone Composition with Dual-Energy CT: In Vivo Analysis and Comparison with X-ray Diffraction

Hidas

Eliahou²,

Duvdevani³

et al. 2010

Radiology

210

101

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Section: Genitourinary Imaging: Dual-energy Ct Determination Of Renalmentioning

confidence: 99%

Section: Genitourinary Imaging: Dual-energy Ct Determination Of Renalmentioning

confidence: 99%

Determination of Renal Stone Composition with Dual-Energy CT: In Vivo Analysis and Comparison with X-ray Diffraction

Hidas

Eliahou²,

Duvdevani³

et al. 2010

Radiology

210

101

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show abstract

“…(5) has N d non-linear equations with N k unknowns. Here, N d is the total number of detector channels.…”

Section: Effective Kvp Estimationmentioning

confidence: 99%

“…Several approaches have been pursued, both experimentally and as commercial offerings. [3][4][5][6] Among those approaches, fast kVp switching, where the kVp alternates between low and high kVp every view, has several benefits including fine temporal view registration, helical and axial acquisitions, and full field of view. It also presents some challenges.…”

Section: Introductionmentioning

confidence: 99%

Dual energy CT via fast kVp switching spectrum estimation

Langan

et al. 2009

SPIE Proceedings

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Recently there has been significant interest in dual energy CT imaging with several acquisition methods being actively pursued. Here we investigate fast kVp switching where the kVp alternates between low and high kVp every view. Fast kVp switching enables fine temporal registration, helical and axial acquisitions, and full field of view. It also presents several processing challenges. The rise and fall of the kVp, which occurs during the view integration period, is not instantaneous and complicates the measurement of the effective spectrum for low and high kVp views. Further, if the detector digital acquisition system (DAS) and generator clocks are not fully synchronous, jitter is introduced in the kVp waveform relative to the view period.In this paper we develop a method for estimation of the resulting spectrum for low and high kVp views. The method utilizes static kVp acquisitions of air with a small bowtie filter as a basis set. A fast kVp acquisition of air with a small bowtie filter is performed and the effective kVp is estimated as a linear combination of the basis vectors. The effectiveness of this method is demonstrated through the reconstruction of a water phantom acquired with a fast kVp acquisition. The impact of jitter due to the generator and detector DAS clocks is explored via simulation. The error is measured relative to spectrum variation and material decomposition accuracy.

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“…On the other hand dual-layer sandwich detectors [3,4] can be embedded into a conventional CT system. Basically two scintillator detectors are placed on top of each other ( Fig.…”

Section: Introductionmentioning

confidence: 99%

SNR performance comparison of dual-layer detector and dual-kVp spectral CT

Heismann

Wirth

2007

2007 IEEE Nuclear Science Symposium Conference Record

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-Tube-based dual-kVp and detector-based duallayer sandwich detector CT systems can be used to generate spectral CT data. We investigate the influence of their energy weighting functions on the performance of reconstructed base material coefficient images and projections. A Monte-Carlo (MC) simulation of the noise propagation for typical water and bone CT projections is used. We find a large difference in the SNR of the reconstructed coefficient projections. Dual-kVp scanning methods yield a factor of 2 better SNR in the coefficient projections than dual-layer detector based CT. This can be explained by the degree of overlap of the weighting functions, especially for low-energy X-ray quanta.

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Material Separation with Dual-Layer CT

Cited by 82 publications

References 4 publications

Determination of Renal Stone Composition with Dual-Energy CT: In Vivo Analysis and Comparison with X-ray Diffraction

Determination of Renal Stone Composition with Dual-Energy CT: In Vivo Analysis and Comparison with X-ray Diffraction

Dual energy CT via fast kVp switching spectrum estimation

SNR performance comparison of dual-layer detector and dual-kVp spectral CT

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