Temporal resolution improvement in cardiac CT using PICCS (TRI‐PICCS): Performance studies

Tang, Jie; Hsieh, Jiang; Chen, Guang-Hong

doi:10.1118/1.3460318

Cited by 69 publications

(83 citation statements)

References 43 publications

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“…For the typical third generation architecture with a single X-ray tube and a single detector array positioned on a gantry and rotated jointly around the patient, the temporal resolution is approximately half of the gantry rotation time [15]. Modern single-tube systems have gantry rotation times of approximately 300 ms (270-350 ms), and a temporal resolution of approximately 150 ms. Temporal resolution can be improved using reconstruction techniques that work with limited projection data [16,17].…”

Section: Cardiac Ct Has Old Roots As Wellmentioning

confidence: 99%

Computed tomography—old ideas and new technology

2011

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Section: Cardiac Ct Has Old Roots As Wellmentioning

confidence: 99%

Computed tomography—old ideas and new technology

2011

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“…Note that there is no need to perform a full SVD in SVT λ (X), since only those singular values above the selected regularization parameter λ are needed as shown in Eq. (18). However, in the application presented in our paper, the difference between a full SVD and an economical SVD is negligible from computation load standpoint since we only have 3-5 time image columns and thus only 3-5 singular values.…”

Section: E Smart-recon: Objective Function and Numerical Implementmentioning

confidence: 99%

“…When a prior CT image of the same image object without limited-view artifacts is available for use in the reconstruction, limited-view artifacts can be mitigated using the PICCS algorithm 4,7,18 for an angular span greater than 180…”

Section: D Nuclear Norm Of the Prior Image Augmented Spatial-tempomentioning

confidence: 99%

“…7,18 However, to the best of the authors' knowledge, there is no work published yet to show that time-resolved CT images can be reconstructed without severe limited-view angle artifacts when the angular span of the data is significantly below 180…”

Section: Introductionmentioning

confidence: 99%

“…7,17,18 Recently, it has been shown that, when the angular span is not significantly shorter than 180…”

Section: Introductionmentioning

confidence: 99%

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Synchronized multiartifact reduction with tomographic reconstruction (SMART‐RECON): A statistical model based iterative image reconstruction method to eliminate limited‐view artifacts and to mitigate the temporal‐average artifacts in time‐resolved CT

Chen

2015

Medical Physics

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Purpose: In x-ray computed tomography (CT), a violation of the Tuy data sufficiency condition leads to limited-view artifacts. In some applications, it is desirable to use data corresponding to a narrow temporal window to reconstruct images with reduced temporal-average artifacts. However, the need to reduce temporal-average artifacts in practice may result in a violation of the Tuy condition and thus undesirable limited-view artifacts. In this paper, the authors present a new iterative reconstruction method, synchronized multiartifact reduction with tomographic reconstruction (SMART-RECON), to eliminate limited-view artifacts using data acquired within an ultranarrow temporal window that severely violates the Tuy condition. Methods: In time-resolved contrast enhanced CT acquisitions, image contrast dynamically changes during data acquisition. Each image reconstructed from data acquired in a given temporal window represents one time frame and can be denoted as an image vector. Conventionally, each individual time frame is reconstructed independently. In this paper, all image frames are grouped into a spatial-temporal image matrix and are reconstructed together. Rather than the spatial and/or temporal smoothing regularizers commonly used in iterative image reconstruction, the nuclear norm of the spatial-temporal image matrix is used in SMART-RECON to regularize the reconstruction of all image time frames. This regularizer exploits the low-dimensional structure of the spatial-temporal image matrix to mitigate limited-view artifacts when an ultranarrow temporal window is desired in some applications to reduce temporal-average artifacts. Both numerical simulations in two dimensional image slices with known ground truth and in vivo human subject data acquired in a contrast enhanced cone beam CT exam have been used to validate the proposed SMART-RECON algorithm and to demonstrate the initial performance of the algorithm. Reconstruction errors and temporal fidelity of the reconstructed images were quantified using the relative root mean square error (rRMSE) and the universal quality index (UQI) in numerical simulations. The performance of the SMART-RECON algorithm was compared with that of the prior image constrained compressed sensing (PICCS) reconstruction quantitatively in simulations and qualitatively in human subject exam. Results: In numerical simulations, the 240• short scan angular span was divided into four consecutive 60• angular subsectors. SMART-RECON enables four high temporal fidelity images without limitedview artifacts. The average rRMSE is 16% and UQIs are 0.96 and 0.95 for the two local regions of interest, respectively. In contrast, the corresponding average rRMSE and UQIs are 25%, 0.78, and 0.81, respectively, for the PICCS reconstruction. Note that only one filtered backprojection image can be reconstructed from the same data set with an average rRMSE and UQIs are 45%, 0.71, and 0.79, respectively, to benchmark reconstruction accuracies. For in vivo contrast enhanced cone beam CT data acquired from...

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Motion compensation in the region of the coronary arteries based on partial angle reconstructions from short‐scan CT data

et al. 2017

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Due to the fast reconstruction of PAMoCo images and the introduction of a new motion model, we were able to re-initialize the optimization routine at pre-selected parameter sets and thereby increase the potential of the MAM algorithm. From the phantom measurement we conclude that PAMoCo performed almost equally well in all cardiac phases and suggest applying the PAMoCo algorithm for single source systems in case of patients with high or irregular heart rates.

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Temporal resolution improvement in cardiac CT using PICCS (TRI‐PICCS): Performance studies

Cited by 69 publications

References 43 publications

Computed tomography—old ideas and new technology

Computed tomography—old ideas and new technology

Synchronized multiartifact reduction with tomographic reconstruction (SMART‐RECON): A statistical model based iterative image reconstruction method to eliminate limited‐view artifacts and to mitigate the temporal‐average artifacts in time‐resolved CT

Motion compensation in the region of the coronary arteries based on partial angle reconstructions from short‐scan CT data

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