Abstract：Objective To study the use of the optimal monochromatic image technique in dual-energy Spectral imaging to optimize
the image quality in head and neck CT angiography (CTA). Methods 30 patients were selected to undergo head and neck CTA using
Spectral scan mode. After scanning, 5 sets of monochromatic images at 60, 65, 70, 75 and 80 keV were reconstructed. Images were
transferred to AW4.6 workstation for MPR, VR and CPR reconstruction. Two experienced radiologists evaluated the subjective
image quality with a 4-point scoring system. The consistency of the scores were evaluated by Kappa test. The CT values and their
standard deviations of the aortic arch, common carotid artery, internal carotid artery, middle cerebral artery, cleidomastoid, and brain
parenchyma were measured. The signal to noise ratio (SNR) and contrast to noise ratio (CNR) of the cervical vessels were calculated.
Measurements were statistically compared between the five groups. Results The differences of SNR, CNR and subjective image
scores among the 5 groups were statistically significant (P<0.05). The scores of the two radiologists were consistent with Kappa value
>0.800. SNR and CNR of the 60 keV group and the 65 keV group were also the highest, and the CT values of the vessels measured
in these two groups were all greater than 300 HU, which was conducive to vascular display. The 60 keV group had the highest
subjective score, which was (3.64±0.49) score. Conclusion Spectrum CT Optimal Monochromatic Image Technique can improve
the image quality of head and neck CTA, and the optimal energy level of head and neck CTA imaging is 60 keV.
马光明，于勇，陈静，党珊，于楠，段海峰，窦越群. 能谱CT单能量技术优化头颈CTA图像质量研究[J]. 中国医疗设备, 2021, 36(8): 86-89.
MA Guangming, YU Yong, CHEN Jing, DANG Shan, YU Nan, DUAN Haifeng, DOU Yuequn. Research on Optimization of Head and Neck CTA Image Quality by Spectrum CT Optimal
Monochromatic Image Technique. China Medical Devices, 2021, 36(8): 86-89.
