颈动脉CTA过程中应用大螺距扫描配合能谱CT双低减影法的效果及对辐射剂量和对比剂用量的影响

doi:10.7517/issn.1674-0475.201103

摘要/Abstract

摘要： 本研究选取了86例因颈动脉病变引起脑供血不足的患者，均行颈动脉CTA检查，其中43例作为对照组，行常规扫描模式，另选43例作为研究组，配合能谱CT双低减影法行大螺距扫描，以探讨大螺距扫描配合能谱CT双低减影法在颈动脉CT血管成像（CTA）过程中的应用效果及对辐射剂量、对比剂用量的影响。结果显示，研究组颈动脉各段血管腔CT值均高于对照组（P<0.05）；研究组颈总动脉、颈内动脉信噪比（SNR）、对比噪声比（CNR）均高于对照组（P<0.05）；研究组图像质量平均分值高于对照组（P<0.05）；研究组鞍上骨皮质差值低于对照组，去骨效果评分高于对照组（P<0.05）；研究组剂量长度乘积（DLP）、容积CT剂量指数（CTDlvol）、有效剂量（ED）、碘摄入量均小于对照组（P<0.05）。由此可见，采用大螺距扫描配合能谱CT双低减影法行颈动脉CTA，能显著改善检查效果，提高图像质量，且能减少辐射剂量和对比剂用量。

关键词: 颈动脉病变, 脑供血不足, CT血管成像, 大螺距扫描, 能谱CT双低减影法, 图像质量

Abstract: In this paper, the application effect of large-pitch scanning combined with energy spectrum CT double-low subtraction in the process of carotid CT angiography (CTA) were explored, as well as the influence on the radiation dose and the dose of contrast agent. We chose 86 cases of cerebral insufficiency caused by carotid artery disease, and all patients underwent carotid CTA. Among them, 43 cases underwent conventional scanning mode as the control group, and the other 43 cases underwent large-pitch scanning combined with energy spectrum CT double low subtraction method as the study group. The results showed that the CT values of each segment of the carotid artery CTA in the study group were higher than those in the control group (P<0.05). The signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) of the common carotid artery and internal carotid artery in the study group were higher than those in the control group (P<0.05). The average score of image quality in the study group was higher than that of the control group (P<0.05). The difference of suprasellar cortex in the study group was lower than that of the control group, 375 and the score of bone removal effect was higher than that of the control group (P<0.05). The dose length product (DLP) of the study group were less than those of the control group (P<0.05), as well as CT dose index (CTDlvol), effective dose (ED) and iodine intake. It can be seen that the application of large-pitch scanning and energy spectrum CT double-low subtraction for carotid CTA can significantly improve the inspection effect and the image quality, and reduce the radiation dose and the amount of contrast agent.

Key words: carotid artery disease, cerebral insufficiency, CT angiography, large pitch scan, energy spectrum CT double low subtraction, image quality

赵欣耘, 李曼. 颈动脉CTA过程中应用大螺距扫描配合能谱CT双低减影法的效果及对辐射剂量和对比剂用量的影响[J]. 影像科学与光化学, 2021, 39(3): 375-380.

ZHAO Xinyun, LI Man. Effect of Large-pitch Scanning Combined with Energy Spectrum CT Double-low Subtraction in Carotid CTA and the Influence on the Dose of Radiation and Contrast Medium[J]. IMAGING SCIENCE AND PHOTOCHEMISTRY, 2021, 39(3): 375-380.

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