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
Korean Journal of Radiology
;
: 881-887, 2017.
Article
in English
| WPRIM
| ID: wpr-191318
ABSTRACT
OBJECTIVE:
Using a pulsating coronary artery phantom at high heart rate settings, we investigated the efficacy of a motion correction algorithm (MCA) to improve the image quality in dual-energy spectral coronary CT angiography (CCTA). MATERIALS ANDMETHODS:
Coronary flow phantoms were scanned at heart rates of 60–100 beats/min at 10-beats/min increments, using dual-energy spectral CT mode. Virtual monochromatic images were reconstructed from 50 to 90 keV at 10-keV increments. Two blinded observers assessed image quality using a 4-point Likert Scale (1 = non-diagnostic, 4 = excellent) and the fraction of interpretable segments using MCA versus conventional algorithm (CA). Comparison of variables was performed with the Wilcoxon rank sum test and McNemar test.RESULTS:
At heart rates of 70, 80, 90, and 100 beats/min, images with MCA were rated as higher image scores compared to those with CA on monochromatic levels of 50, 60, and 70 keV (each p < 0.05). Meanwhile, at a heart rate of 90 beats/min, image interpretability was improved by MCA at a monochromatic level of 60 keV (p < 0.05) and 70 keV (p < 0.05). At a heart rate of 100 beats/min, image interpretability was improved by MCA at monochromatic levels of 50 keV (from 69.4% to 86.1%, p < 0.05), 60 keV (from 55.6% to 83.3%, p < 0.05) and 70 keV (from 33.3% to 69.3%, p < 0.05).CONCLUSION:
Low-keV monochromatic images combined with MCA improves image quality and image interpretability in CCTAs at high heart rates.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Angiography
/
Tomography, X-Ray Computed
/
Coronary Vessels
/
Heart
/
Heart Rate
Type of study:
Prognostic study
Language:
English
Journal:
Korean Journal of Radiology
Year:
2017
Type:
Article
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