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| A prospective study of virtual monoenergetic for bronchial artery angiography in dual-energy CT |
| HU Na, LI Yong, ZHAO Lin-wei, CHEN Hong, FENG Ying, YANG Guo-qing, FU Quan-shui |
| Department of Radiology, Suining Central Hospital, Suining Sichuang 629000, China |
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Abstract Objective: To study the virtual monoenergetic image quality and radiation dose of dual-energy mode with single-energy mode for bronchial artery in dual-source dual-energy CT. To explore the clinical significance of dual-source CT dual-energy virtual single-energy technology in bronchial artery imaging. Methods: Sixty-four patients were randomly dived into 2 groups: dual-energy group and single-energy group, 32 cases for each group. 1.2 mL/kg of iodine contrast medium (370 mgI/mL) for patients was injected via the antecubital vein at a rate of 4 mL/s, and 40 mL normal saline was added. One group of enhanced images was obtained for each patient in the single-energy group, and multiple groups of images ranging from 40 keV to 190 keV were generated in the dual-energy group, and the group with the highest contrast signal-to-noise ratio(CNR) was automatically obtained through virtual single-energy technology. A 5-point scale was carried out to evaluate angiography image quality by two radiologists subjectively. Mean CT attenuation value and standard deviation were measured to calculate the CNR and single-to-noise ratio(SNR). Volume computed tomography dose index(CTDI) and the dose-length product(DLP) for calculating radiation dose were recorded automatically. Subjective scores and quantitative parameters were compared via Mann-Whitney U test and T test respectively. Results: There were excellent agreements between two radiologists for grading right and left bronchial arteries respectively(all Kappa value>0.8). Image quality scores were significantly higher in dual-energy group compared with single-energy group for both right(P<0.001) and left(P=0.001) angiography branches. Compared with single-energy, dual-energy group demonstrated higher CT attenuation(P<0.001, P<0.001), standard deviation(P<0.001, P<0.001), CNR(P=0.001, P=0.003) and SNR(P=0.012, P=0.035) in right and left bronchial arteries respectively. There were no significant differences in two groups for CTDI and DLP respectively(P=0.097, P=0.132). Conclusion: Dual-energy bronchial artery CT angiography with virtual monochromatic technique has significant higher image quality which can better meet the need for diagnosis and preoperative evaluation.
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Received: 23 November 2018
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