摘要
目的比较高和超高b值弥散加权成像(DWI)图像质量和显示直肠癌效果,优化选择b值。方法对58例直肠腺癌患者行多个b值(800、1 000、1 500、2 000 s/mm^2)DWI扫描(DWI800、DWI1 000、DWI1 500、DWI2 000),对比图像质量和病变信号强度分级,测量并比较不同b值下肿瘤信噪比(SNR)、对比度噪声比(CNR)和信号强度比(SIR)。结果 DWI800、DWI1 000、DWI1 500及DWI2 000图像质量评分差异均有统计学意义(P<0.001),且DWI800、DWI1 000、DWI1 500图像质量评分呈升高趋势,DWI1 000与DWI1 500间差异有统计学意义(P<0.001)。DWI800、DWI1 000、DWI1 500图像信号强度为Ⅰ型者逐渐增多、Ⅱ型逐渐减少(P均<0.001),DWI1 500图像中无Ⅲ型信号;DWI2 000图像中Ⅰ型信号略少于DWI1 500,差异无统计学意义(P=0.096)。随b值升高,SNR、CNR和SIR均逐渐降低(P均<0.001)。结论 b值为800、1 000、1 500、2 000 s/mm^2的DWI图像中,b=1 500 s/mm^2时图像质量最优,显示直肠癌病灶最佳。
Objective To compare image quality and display effect of rectal cancer with diffusion weighted imaging(DWI)using high and ultrahigh b value,so as to optimize b value selection.Methods Multiple b values(800,1000,1500 and 2000 s/mm 2)DWI scanning(DWI 800,DWI 1000,DWI 1500 and DWI 2000)were performed on 58 patients with rectal adenocarcinoma.The imaging quality,grading signal intensity,signal-to-noise ratio(SNR),contrast-to-noise ratio(CNR)and signal intensity ratio(SIR)were measured and compared among DWI images obtained using different b values.Results The image quality scores of DWI 800,DWI 1000,DWI 1500 and DWI 2000 were statistically different(P<0.001).The image quality scores of DWI 800,DWI 1000 and DWI 1500 showed an increasing trend,and the difference between DWI 1000 and DWI 1500 was statistically significant(P<0.001).On DWI 800,DWI 1000,and DWI 1500 images,typeⅠsignal lesions increased while typeⅡdecreased gradually(all P<0.001),and there was no typeⅢsignal on DWI 1500.The number of typeⅠsignal lesions on DWI 2000 was slightly fewer than that of DWI 1500,but there was not statistical difference(P=0.096).With the increase of b value,SNR,CNR and SIR all gradually decreased(all P<0.001).Conclusion Among DWI images with b value of 800,1000,1500 and 2000 s/mm 2,image quality of b=1500 s/mm 2 was the best,and displaying of rectal cancer lesions was the best.
作者
陆志华
蒋恒
翁晓燕
姚鸿欢
曹燕
陆文俊
胡芳
季立标
LU Zhihua;JIANG Heng;WENG Xiaoyan;YAO Honghuan;CAO Yan;LU Wenjun;HU Fang;JI Libiao(Department of Radiology,Changshu Hospital Affiliated to Soochow University,Changshu No.1 People's Hospital,Changshu 215500,China)
出处
《中国医学影像技术》
CSCD
北大核心
2020年第12期1858-1862,共5页
Chinese Journal of Medical Imaging Technology
基金
江苏省青年医学重点人才计划(QNRC2016212)
苏州市临床重点病种诊疗计划专项(LCZX201823)
苏州市姑苏卫生人才培养项目(GSWS2019077)
常熟市科技发展计划(CS201624)。
关键词
直肠肿瘤
弥散磁共振成像
B值
rectal neoplasms
diffusion magnetic resonance imaging
b value
