摘要
目的:探讨18氟-氟代脱氧葡萄糖(18 F-fluorodeoxyglucose,18 F-FDG)PET图像异质性对食管癌放疗靶区勾画的影响。方法:28例经病理确诊为食管鳞癌初治患者治疗前行18 F-FDG PET/CT扫描。通过视觉法和三维图像纹理参数(能量和熵)分析获得FDG摄取异质性。CT图像上勾画出肿瘤靶区(GTVCT)。PET图像上肿瘤靶区采用自动勾画法,分别采用40%SUVmax阈值勾画(GTVPET40%)和标准化摄取值(standardized uptake value,SUV)=2.5绝对值阈值勾画(GTVPET2.5)。分析FDG摄取异质性与不同方法勾画肿瘤靶区体积差值间的相关性。结果:3种方法获得的肿瘤靶区差异有统计学意义,GTVCT为(45.00±43.40)cm3明显大于GTVPET40%的(20.42±16.12)cm3和GTVPET2.5(35.88±36.33)cm3,其中GTVCT与GTVPET40%差异有统计学意义,t=4.34,P=0.00;GTVCT与GTVPET2.5差异有统计学意义,t=4.80,P=0.00;GTVPET40%与GTVPET2.5:差异有统计学意义,t=3.59,P=0.00。肿瘤摄取异质性与传统代谢参数SUVmax和SUVmean及靶区体积间存在相关性,|r|=0.41,P≤0.03。GTVPET40%和GTVPET2.5之间的差异与熵呈正相关,r=0.41,P=0.029;与能量负相关,r=-0.39,P=0.04。视觉评分与GTVPET40%和GTVPET2.5之间的百分率差值也存在相关性,r=0.59,P=0.001。结论:PET图像上靶区勾画受到FDG摄取异质性的影响,特别是异质性较大的肿瘤。PET精确靶区勾画方法需要考虑到肿瘤异质性的影响。
OBJECTIVE:To evaluate new PET image parameters,FDG uptake heterogeneity defined by texture anal- ysis or visual scoring,and its impact on target volume delineation for squamous cell esophageal cancer (SCEC). METH- ODS: Patients with newly diagnosed and pathologically proved SCEC (n=28) were received whole body 18 F-FDG PET/ CT scanning before treatments. Intra-tumor 18F_FDG uptake heterogeneity was accessed by visual scoring and three-di- mensional image texture feature (entropy and energy). Tumor volumes were delineated on the CT (GTVcT) and PET images, using a fixed threshold at 40% of the SUVmax (GTVprT40) or the absolute SUV cut-off values of 2.5 (GTVpET2.S).
出处
《中华肿瘤防治杂志》
CAS
北大核心
2013年第16期1270-1273,1278,共5页
Chinese Journal of Cancer Prevention and Treatment