Effect of a Novel Intracycle Motion Correction Algorithm on Dual-Energy Spectral Coronary CT Angiography: A Study with Pulsating Coronary Artery Phantom at High Heart Rates

Xing, Yan; Zhao, Yuan; Guo, Ning; Pan, Chen; Azati, Gulina; Wang, Yanwei; Liu, Wenya

doi:10.3348/kjr.2017.18.6.881

Cited by 4 publications

(5 citation statements)

References 15 publications

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“…Excessively low CT value will weaken the contrast between the blood vessel and surrounding tissue, and the coronary artery can be displayed clearly-when the CT value is approximately 350 HU. Our previous study also found that the adequate enhancement obtained at the lower monochromatic energy levels in the dual-energy spectral CT imaging (50 keV, 60 keV, 70 keV) was also important for a motion correction algorithm that requires the real-time tracking of coronary artery motion to be successful 17 . On the other hand, excessively high CT values in the vessel could also be detrimental.…”

Section: Discussionmentioning

confidence: 91%

Exploring the best monochromatic energy level in dual energy spectral imaging for coronary stents after percutaneous coronary intervention

Liu

Wang

et al. 2021

Sci Rep

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In this study, the optimal monochromatic energy level in dual-energy spectral CT required for imaging coronary stents after percutaneous coronary intervention (PCI) was explored. Thirty-five consecutive patients after PCI were examined using the dual-energy spectral CT imaging mode. The original images were reconstructed at 40–140 keV (10-keV interval) monochromatic levels. The in-stent and out-stent CT values at each monochromatic level were measured to calculate the signal-to-noise ratio(SNR) and contrast-to-noise ratio (CNR) for the vessel and the CT value difference between the in-stent and out-stent lumen (dCT (in–out)), which reflects the artificial CT number increase due to the beam hardening effect caused by the stents. The subjective image quality of the stent and in-stent vessel was evaluated by two radiologists using a 5-point scale. With the increase in energy level, the CT value, SNR, CNR, and dCT (in–out) all decreased. At 80 keV, the mean CT value in-stent reached (345.24 ± 93.43) HU and dCT (in–out) started plateauing. In addition, the subjective image quality of the stents and vessels peaked at 80 keV. The 80 keV monochromatic images are optimal for imaging cardiac patients with stents after PCI, balancing the enhancement and SNR and CNR in the vessels while minimizing the beam hardening artifacts caused by the stents.

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Section: Discussionmentioning

confidence: 91%

Exploring the best monochromatic energy level in dual energy spectral imaging for coronary stents after percutaneous coronary intervention

Liu

Wang

et al. 2021

Sci Rep

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“…Cho et al (8) demonstrated that the coronary artery image quality and diagnostic accuracy (i.e., measurement errors of the MLA and MLD) improved on using MCA at high HRs (i.e., 80 bpm and 100 bpm), although there was no benefit at low HRs (i.e., 60 bpm). Xing et al (17) also showed that the coronary artery image quality improved on using MCA at 70–100 bpm (10-bpm interval) on monochromatic levels of 50, 60, and 70 keV in their phantom study using dual-energy spectral CT. Their results have similar trends to our results. However, they used a 64-slice single-source dual-energy CT scanner, and their maximum HR was set at 100 bpm.…”

Section: Discussionmentioning

confidence: 97%

“…Prior studies have documented beneficial effects of MCA in terms of image quality and diagnostic accuracy using a pulsating coronary phantom (Mocomo; Fuyo Corp, Tokyo, Japan) (817). Cho et al (8) demonstrated that the coronary artery image quality and diagnostic accuracy (i.e., measurement errors of the MLA and MLD) improved on using MCA at high HRs (i.e., 80 bpm and 100 bpm), although there was no benefit at low HRs (i.e., 60 bpm).…”

Section: Discussionmentioning

confidence: 99%

Influence of Heart Rate and Innovative Motion-Correction Algorithm on Coronary Artery Image Quality and Measurement Accuracy Using 256-Detector Row Computed Tomography Scanner: Phantom Study

et al. 2019

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ObjectiveTo investigate the efficacy of motion-correction algorithm (MCA) in improving coronary artery image quality and measurement accuracy using an anthropomorphic dynamic heart phantom and 256-detector row computed tomography (CT) scanner.Materials and MethodsAn anthropomorphic dynamic heart phantom was scanned under a static condition and under heart rate (HR) simulation of 50–120 beats per minute (bpm), and the obtained images were reconstructed using conventional algorithm (CA) and MCA. We compared the subjective image quality of coronary arteries using a four-point scale (1, excellent; 2, good; 3, fair; 4, poor) and measurement accuracy using measurement errors of the minimal luminal diameter (MLD) and minimal luminal area (MLA).ResultsCompared with CA, MCA significantly improved the subjective image quality at HRs of 110 bpm (1.3 ± 0.3 vs. 1.9 ± 0.8, p = 0.003) and 120 bpm (1.7 ± 0.7 vs. 2.3 ± 0.6, p = 0.006). The measurement error of MLD significantly decreased on using MCA at 110 bpm (11.7 ± 5.9% vs. 18.4 ± 9.4%, p = 0.013) and 120 bpm (10.0 ± 7.3% vs. 25.0 ± 16.5%, p = 0.013). The measurement error of the MLA was also reduced using MCA at 110 bpm (19.2 ± 28.1% vs. 26.4 ± 21.6%, p = 0.028) and 120 bpm (17.9 ± 17.7% vs. 34.8 ± 19.6%, p = 0.018).ConclusionMotion-correction algorithm can improve the coronary artery image quality and measurement accuracy at a high HR using an anthropomorphic dynamic heart phantom and 256-detector row CT scanner.

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“…Currently, the evaluation of the hepatic vascular system is primarily through the use of multi-slice computed tomography (CT) angiography (MSCTA). Recently, spectral CT imaging has been gradually applied clinically ( 5 6 7 ). Spectral CT energy imaging using single-source instantaneous kVp switching technology can switch between high and low tube voltage (140 kVp and 80 kVp) instantaneously in less than 0.5 ms for a quasi-simultaneous sampling of two sets of data.…”

Section: Introductionmentioning

confidence: 99%

Optimal Monochromatic Imaging of Spectral Computed Tomography Potentially Improves the Quality of Hepatic Vascular Imaging

Yin

Gao

et al. 2018

Korean J Radiol

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ObjectiveTo investigate the efficiency of spectral computed tomography (CT) optimal monochromatic images in improving imaging quality of liver vessels.Materials and MethodsThe imaging data of 35 patients with abdominal CT angiography were retrospectively analyzed. Hepatic arteries, portal veins, and hepatic veins were reconstructed with mixed energy (quality check, QC), 70 keV and optimal monochromatic mode. Comparative parameters were analyzed including CT value, image noise (IN), contrast-to-noise ratio (CNR), signal-to-noise ratio (SNR), and subjective qualitative analysis.ResultsThe optimal monochromatic value for assessment of the common hepatic artery, portal vein, and hepatic vein ranged between 49 keV and 53 keV, with a mean of 51 keV. There were statistically significant differences (p < 0.001) among the optimal monochromatic, 70 keV and QC images with regards to the hepatic vascular CT value, IN, CNR, SNR, and subjective qualitative score. CNR of the common hepatic artery in the optimal monochromatic, 70 keV and QC groups was 24.6 ± 10.9, 18.1 ± 8.3, and 11.6 ± 4.6, respectively (p < 0.001) with subjective scores of 4.7 ± 0.2, 4.0 ± 0.3, and 3.6 ± 0.4, respectively (p < 0.001). CNR of the hepatic portal vein was 6.9 ± 2.7, 4.3 ± 1.9, and 3.0 ± 2.1, respectively (p < 0.001) with subjective scores of 4.5 ± 0.3, 3.9 ± 0.4, and 3.3 ± 0.3, respectively (p < 0.001). CNR of the hepatic vein was 5.7 ± 2.3, 4.2 ± 1.9, and 2.7 ± 1.4, respectively with subjective scores of 4.3 ± 0.3, 3.8 ± 0.4, and 3.2 ± 0.3, respectively (p < 0.001).ConclusionOptimal monochromatic images can lead to improvement in the imaging parameters and optimization of the image quality of the common hepatic artery, hepatic portal vein and hepatic vein compared with conventional mixed kV and with 70 keV datasets.

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Effect of a Novel Intracycle Motion Correction Algorithm on Dual-Energy Spectral Coronary CT Angiography: A Study with Pulsating Coronary Artery Phantom at High Heart Rates

Cited by 4 publications

References 15 publications

Exploring the best monochromatic energy level in dual energy spectral imaging for coronary stents after percutaneous coronary intervention

Exploring the best monochromatic energy level in dual energy spectral imaging for coronary stents after percutaneous coronary intervention

Influence of Heart Rate and Innovative Motion-Correction Algorithm on Coronary Artery Image Quality and Measurement Accuracy Using 256-Detector Row Computed Tomography Scanner: Phantom Study

Optimal Monochromatic Imaging of Spectral Computed Tomography Potentially Improves the Quality of Hepatic Vascular Imaging

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