Completeness map evaluation demonstrated with candidate next‐generation cardiac CT architectures

Liu, Baodong; Bennett, James R.; Wang, Ge; Man, Bruno De; Zeng, Kai; Yin, Zhye; Fitzgerald, Peter; Yu, Hengyong

doi:10.1118/1.3700172

Cited by 23 publications

(21 citation statements)

References 23 publications

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“…The level of cone‐beam artifacts associated with an architecture is evaluated by computing the amount of data missing in Radon space . Our completeness score is defined as the percentage of the Radon space that is actually measured, for the worst‐case voxel location in the imaged volume.…”

Section: Methods — Evaluation Metricsmentioning

confidence: 99%

Quest for the ultimate cardiac CT scanner

et al. 2017

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Purpose To quantitatively evaluate and compare six proposed system architectures for cardiac CT scanning. Methods Starting from the clinical requirements for cardiac CT, we defined six dedicated cardiac CT architectures. We selected these architectures based on a previous screening study, and defined them in sufficient detail to comprehensively analyze their cost and performance. We developed rigorous comparative evaluation methods for the most important aspects of performance and cost, and we applied these evaluation criteria to the defined cardiac CT architectures. Results We found that CT system architectures based on the third-generation geometry provide nearly linear performance improvement versus the increased cost of additional beam lines (i.e. source-detector pairs), although similar performance improvement could be achieved with advanced motion correction algorithms. The third-generation architectures outperform even the most promising of the proposed architectures that deviate substantially from the traditional CT system architectures. Conclusion This work confirms the validity of the current trend in commercial CT scanner design. However, we anticipate that over time, CT hardware and software technologies will evolve, the relative importance of the performance criteria will change, the relative costs of components will vary, some of the remaining challenges will be addressed, and perhaps new candidate architectures will be identified; therefore, the conclusion of a comparative analysis like this may change. The evaluation methods that we used can provide a framework for other researchers to analyze their own proposed CT architectures.

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Section: Methods — Evaluation Metricsmentioning

confidence: 99%

Quest for the ultimate cardiac CT scanner

et al. 2017

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“…Some methods to determine the sampling completeness in projections were introduced for pinhole SPECT [5], [6]. Another paper proposed a completeness map for a number of candidate cardiac CT system designs [7]. We have developed a similar method to quantify this incompleteness for motion corrected helical CT, as a predictor of the reconstruction accuracy.…”

Section: Introductionmentioning

confidence: 99%

Quantification of local reconstruction accuracy for helical CT with motion correction

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Fulton

et al. 2014

2014 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)

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In previous work, we have demonstrated the feasibility of rigid motion correction for helical CT brain imaging, using an optical motion tracking system. To correct for motion during reconstruction, the object is considered stationary, while the inverse of the motion is applied to the CT system. As a result, the original helical CT trajectory is replaced with a new, irregular trajectory. We have observed that, depending on the motion and the CT scanning parameters, the irregular motion corrected trajectory may not provide sufficient data for tomographic reconstruction. The known completeness conditions, such as the Tuy condition, assume untruncated projections and therefore can not be applied to helical CT, where the projections are axially truncated. Other groups have developed methods to quantify the degree to which sampling completeness is satisfied locally in pinhole SPECT. Here we propose a related approach to quantify the local completeness of the irregular CT trajectory, by assessing to which degree the local Tuy condition is unsatisfied. In a simulation experiment, we compare this empirical local completeness measure to the local occurrence of artifacts. The results indicate if the Tuy value is relatively high in some region, the reconstruction is likely to suffer from artifacts in this region.

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“…In the same time, we propose a reconstruction method for the specific configuration which adopts an iterative algorithm to resolve the reconstruction based on the alterative part projections. Besides, there are missing projection data that is at the region of placing X-ray source devices in the source-detector plate, which will result in artifacts in the reconstructed image [14], [15]. Due to the width of the X-ray source device is in millimeter level, which is much higher than the pixel size of the detector, the conventional artifact deduction methods, such as interpolation [16], [17], regularization in iterative reconstruction [18] cannot handle it well.…”

Section: Introductionmentioning

confidence: 99%

A Novel Stationary CT Scheme Based on High-Density X-Ray Sources Device

et al. 2020

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With the introduction of cold electron sources such as nanotubes, X-ray sources became small in size so that many sources are installed in array to form stationary CT, which brings benefits of simplicity in mechanism and fast response. However, the nanotube-based X-ray source is still singly packaged and hence density of X-ray sources is limited, which introduces severe sparse-view artifacts and could not be used in practice. With the invention of X-ray sources device based on ZnO nanowires as cold electron emitters, a large amount of X-ray sources is first integrated in a flat panel device. In this study, we design a stationary CT architecture using high-density sources devices, called HD-SCT, and develop corresponding reconstruction algorithm. Specifically, several flat panel detectors and X-ray sources devices are spliced together to form a source-detector plate. Multiple source-detector plates are organized as a polygon that encloses object to complete CT scanning. In HD-SCT, X-ray sources are close to object which can significantly decrease CT device volume. The X-ray beam emitted by each source just cover part of object and the spot sources alternately light to completely scan object. Simultaneously, we propose a reconstruction method for the specific configuration which adopts an iterative algorithm to resolve the reconstruction based on alterative part projections, as well as a novel correction process of projection completion for the shadowed area of placing X-ray source devices. To validate the design of the proposed HD-SCT, we execute a series of simulation experiments, which show that the proposed HD-SCT and corresponding reconstruction method effectively remove the artifacts caused by the embed X-ray source device. The results also disclose that with the increase of density of X-ray sources, the resolution of reconstruction has been dramatically improved, which demonstrates the practical value of introducing high-density X-ray sources device into stationary CT design. INDEX TERMS Stationary CT scheme, high-density X-ray sources devices, source-detector plate, iterative reconstruction.

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Completeness map evaluation demonstrated with candidate next‐generation cardiac CT architectures

Cited by 23 publications

References 23 publications

Quest for the ultimate cardiac CT scanner

Quest for the ultimate cardiac CT scanner

Quantification of local reconstruction accuracy for helical CT with motion correction

A Novel Stationary CT Scheme Based on High-Density X-Ray Sources Device

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