飞行时间技术和高清技术对PET/CT图像质量的影响  

Research on impact of time of flight acquisition and high definition reconstruction on PET/CT image quality

作　　者：吴天棋[1] 庄静文[1] 谢峰[1] 白玫[1] 

机构地区：[1]首都医科大学宣武医院医学工程处,北京100053

出　　处：《中国医学装备》2016年第1期2-5,共4页China Medical Equipment

基　　金：国家自然科学基金(81372923)"宽探测器螺旋CT所致的剂量评价方法研究"

摘　　要：目的：分析PET/CT飞行时间技术（TOF）和高清技术（HD）的特点,以指导临床使用。方法：参照美国国家电气制造商协会（NEMA）标准,以PET/CT扫描NEMA标准国际电工委员会（IEC）体模,在TOF＋HD＋OSEM、TOF＋OSEM、HD＋OSEM以及OSEM的4种重建条件下分别进行分析。结果：TOF＋HD＋OSEM组与OSEM组的对比度分别为41.70%~92.53%和32.10%~81.32%,本底变化率分别为1.48%~2.88%和1.71%~2.97%,肺区平均残余误差为11.5%和20.25%。结论：TOF＋HD＋OSEM图像对比度、本底变化率、衰减和散射校正精度均优于其他各组,TOF技术和HD技术配合使用对小病灶对比度有显著提高。Objective： To analyze the characteristics of time of flight（TOF） and High definition（HD） recon struction was analysis on PET/CT for clinical use guidance. Methods： The NEMA body phantom was scaned by PET/CT and reconstructed in the condition of TOF＋HD＋OSEM, TOF＋OSEM, HD＋OSEM and OSEM and was analyzed according to the NEMA standard respectively. Results： The image contrast of group TOF＋HD＋OSEM and group OSEM are 41.70%~92.53% and 32.10%~81.32% respectively. The background variability of group TOF＋HD＋OSEM and group OSEM are 1.48%~2.88% and 1.71%~2.97% respectively. The accuracy of attenuation and scatter corrections of group TOF＋HD＋OSEM and group OSEM are 11.5% and 20.25% respectively. Conclusion： The image contrast, background variability and accuracy of attenuation and scatter corrections with the reconstruction condition of TOF＋HD＋OSEM were superior to other groups. The contrast of small lesions has improved significantly by application of both TOF and HD technology.

关 键 词：飞行时间技术 高清技术 剂量评价 PET/CT 图像质量 

分 类 号：R812[医药卫生—放射医学]