双源CT双能量虚拟平扫对喉癌的诊断价值

发布时间：2018-01-30 12:40

本文关键词： 喉肿瘤体层摄影术 X线计算机质量控制辐射剂量　出处：《中国医学影像学杂志》2017年04期 　论文类型：期刊论文

【摘要】：目的探讨双源CT双能量虚拟平扫代替常规平扫诊断喉癌的可行性,以减少受检者的辐射剂量。资料与方法 49例经手术及病理证实的喉癌患者行颈部常规CT平扫和双能量动、静脉双期扫描,经双能后处理软件处理得到动、静脉期虚拟平扫图,比较常规平扫与虚拟平扫图像病灶平均CT值、病灶信噪比、对比噪声比、病灶形态、图像质量评分及辐射剂量的差异。结果常规平扫图平均CT值、病灶信噪比、对比噪声比及图像质量评分均高于动、静脉期虚拟平扫图像,差异有统计学意义(P0.05),而动、静脉期虚拟平扫图像评分差异无统计学意义(P0.05)。虚拟平扫图的图像评分均在3分以上,达到诊断要求,与常规平扫图像评分比较,差异无统计学意义(P0.05);常规平扫与虚拟平扫病灶形态、大小、边界、发现病灶内囊变坏死、周围间隙侵犯、骨质破坏及周围淋巴结大小比较无差异。双能量动、静脉期扫描较常规三期扫描辐射剂量降低约0.42 mSv(18.3%)。结论采用双能量CT扫描可在保证喉癌患者图像质量不影响诊断的前提下,降低辐射剂量,具有较好的应用价值。
[Abstract]:Objective to explore the feasibility of double source CT dual energy virtual plain scan instead of conventional plain scan in the diagnosis of laryngeal carcinoma. Materials and methods 49 patients with laryngeal carcinoma confirmed by surgery and pathology were examined with conventional CT scan and dual energy arteriovenous scanning. The mean CT value, SNR, noise ratio and shape of the focus were compared between conventional plain scan and virtual plain scan. Results the average CT value, SNR, contrast noise ratio and image quality score of conventional plain scan were higher than that of arteriovenous virtual plain scan. The difference was statistically significant (P 0.05), but there was no significant difference in the image score of virtual plain scan in arteriovenous phase (P 0.05). The image score of virtual plain scan was above 3 points, which met the diagnostic requirements. Compared with the conventional plain scan image score, the difference was not statistically significant (P 0.05). There was no difference between conventional plain scan and virtual plain scan in the shape, size and boundary of the lesions, including cystic necrosis, peripheral space invasion, bone destruction and peripheral lymph node size. The radiation dose of venous phase scan was reduced by 0.42 mSvl18.30.Conclusion Dual-energy CT scan can ensure that the image quality of laryngeal cancer patients will not be affected. It has good application value to reduce the radiation dose.
【作者单位】：昆明医科大学第一附属医院影像学科CT室;
【分类号】：R730.44;R739.65
【正文快照】： 喉癌是常见的头颈部恶性肿瘤,发病率约占全身肿瘤的1%~5%,并呈明显上升趋势[1-2]。CT对喉癌的定位及显示侵犯范围较为理想,常用于术前全面评估病变及制订合理的治疗计划。CT检查一般为平扫、动脉期、静脉期三期扫描,对患者的辐射不容忽视,鉴于颈部有甲状腺这一敏感器官,更应关

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