| 江桂莲,钟朝辉,卓磊,程旭,张丹,徐辉.肝移植术后婴幼儿腹部CT血管成像:对比能谱及低管电压扫描图像质量和辐射剂量[J].中国医学影像技术,2024,40(11):1769~1772 |
| 肝移植术后婴幼儿腹部CT血管成像:对比能谱及低管电压扫描图像质量和辐射剂量 |
| Abdominal CT angiography in infants and young children after liver transplantation: Comparison on image quality and radiation dose between spectrum CT and low tube voltage scanning |
| 投稿时间：2024-04-07 修订日期：2024-07-22 |
| DOI：10.13929/j.issn.1003-3289.2024.11.028 |
| 中文关键词: 儿童 肝移植 图像质量 对比剂 血管造影术 |
| 英文关键词:child liver transplantation image quality contrast media angiography |
| 基金项目:国家自然科学基金项目(82371904)。 |
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| 中文摘要: |
| 目的 对比以能谱CT及低管电压扫描对肝移植术后婴幼儿行腹部CT血管造影(CTA)的图像质量及辐射剂量。方法 纳入41例肝移植术后患儿,其中22例接受能谱CT (能谱组)、19例接受低管电压(80 kV,低管电压组) CT扫描。对能谱组选择50 keV单能量图像观察腹部血管。对2组图像质量进行主、客观评价,后者包括测算肝动脉及门静脉CT值及噪声、肝动脉及门静脉对比度及对比度噪声比(CNR);记录2组容积CT剂量指数(CTDIvol)、剂量长度乘积(DLP)及有效剂量(ED)。结果 组间图像质量主观评分差异无统计学意义(P＞0.05)。低管电压组动脉期肝动脉CT值、对比度动脉及CNR动脉,以及门静脉期肝动脉CT值、肝组织噪声、对比度门静脉及CNR门静脉均高于能谱组(P均＜0.05)。能谱组CTDIvol、DLP及ED均高于低管电压组(P均＜0.05)。结论 相比能谱CT,利用低管电压CT结合迭代重建技术对肝移植术后婴幼儿行腹部CTA可获得更佳图像并降低辐射剂量。 |
| 英文摘要: |
| Objective To compare image quality and radiation dose for abdominal CT angiography (CTA) in infants and young children after liver transplantation using energy spectrum CT and low tube voltage scanning. Methods Totally 41 infants or young children after liver transplantation were included, including 22 cases who underwent energy spectrum CT (energy spectrum group) and 19 cases who underwent low tube voltage (80 kV) CT scanning (low tube voltage group). 50 keV single energy images of energy spectrum group were extracted to observe abdominal blood vessels. Subjective and objective evaluation on image quality were performed, the latter aimed at CT value and noise value of hepatic artery and portal vein, the contrast and contrast-to-noise ratio (CNR) of hepatic artery and portal vein. The examined volume CT dose index (CTDIvol), dose-length product (DLP) and effective dose (ED) of both groups were recorded. Results No significant difference of subjective image quality score was found between groups (P＞0.05). In low tube voltage group, during arterial phase, CT values of hepatic artery, contrastarteries and CNRarteries were higher, and during the portal vein phase, CT values of hepatic artery, liver tissue noise, contrastportal vein and CNRportal vein were all higher than those in energy spectrum group (all P＜0.05). CTDIvol, DLP and ED in energy spectrum group were higher than those in low tube voltage group (all P＜0.05). Conclusion Compared with energy spectrum CT, low tube voltage CT scanning combined with iterative reconstruction technology could result better image quality and lower radiation dose for abdominal CTA in infants and young children after liver transplantation. |
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