颈部淋巴结病变的具有SPS双能量扫描图像质量评估

发布时间：2018-04-16 03:32

本文选题：能谱纯化技术 + 颈部肿大淋巴结　；参考：《中国医学计算机成像杂志》2015年04期

【摘要】：目的:探讨颈部淋巴结肿大患者中采用具有选择性能谱纯化技术(SPS)的双能量(DE)CT扫描的图像质量。方法:经病理证实的46例颈部淋巴结肿大患者纳入研究,随机分为两组,每组23人,分别对应SPS-DECT组和未用SPS的DECT组,扫描前将两组的CTDIVOI设置为14.87 mGy,SPS-DECT组扫描参数:管电压分别为100kV,Sn140kV,管电流分别为157mAs和100mAs;DECT组的2个球管电压分别为140kV和80kV,球管电流分别为50mAs和213mAs,其余参数均相同。由两名有经验的医师对两组图像质量进行双官法评分,利用Kappa检验比较观察者间评分的一致性;采用独立样本t检验比较两组患者平均CT值、噪声、信噪比(SNR)、对比噪声比(CNR)、图像质量评分,并对两组淋巴结钙化显示情况进行分析。以病理证实为金标准,比较两组扫描对病变淋巴结的诊断准确率。结果:共显示110枚肿大淋巴结,两组平均CT值、噪声和信噪比无统计学明显差异(P0.05),但SPS-DECT组的CNR明显高于DECT组(P=0.015,t=2.581)。两组图像质量的主观评分无统计学差异(P0.05)。SPS-DECT组对淋巴结内微小钙化的检出无漏检情况,而DECT对微小钙化显示存在漏检情况。SPS-DECT与DECT组对病变诊断准确率均为95.65%(22/23)。结论:在相同曝光剂量条件下,SPS-DECT具有更高的图像质量,具有潜在降低辐射剂量的作用。
[Abstract]:Objective: to investigate the image quality of double energy detrusor CT scanning with selective energy spectrum purification (SPS) in patients with cervical lymphadenopathy.Methods: 46 patients with cervical lymphadenopathy confirmed by pathology were randomly divided into two groups, 23 in each group, corresponding to SPS-DECT group and DECT group without SPS, respectively.Before scanning, the CTDIVOI of the two groups was set to 14.87 mGy SPS-DECT: the voltage of the tube was 100kV and Sn140kV, the current of the tube was 140kV and 80kV, the current of the tube was 50mAs and 213mAsDECT, and the other parameters were the same.The image quality of the two groups was scored by two experienced physicians, and the consistency of the scores between the observers was compared by Kappa test, and the average CT value and noise of the two groups were compared by independent sample t-test.Signal to noise ratio (SNR), contrast noise ratio (NIR), image quality score, and the display of lymph node calcification in two groups were analyzed.The diagnostic accuracy of pathological diagnosis of lymph nodes was compared between the two groups.Results: there were 110 enlarged lymph nodes. There was no significant difference in CT value, noise and signal-to-noise ratio between the two groups (P 0.05), but the CNR of SPS-DECT group was significantly higher than that of DECT group.There was no significant difference in the subjective score of image quality between the two groups. There was no significant difference in the detection of microcalcification in lymph nodes in SPS-DECT group. However, the diagnostic accuracy of microcalcification in SPS-DECT group and DECT group was 95.65% 2223% (P < 0.05).Conclusion: SPS-DECT with the same exposure dose has higher image quality and has the potential to reduce radiation dose.
【作者单位】：昆明医科大学第一附属医院医学影像科;大理学院附属医院放射科;
【基金】：2014年度云南省医疗卫生单位内设研究机构科研项目
【分类号】：R816.1

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