胸部模型~(18)F-FDG双探头符合显像实验研究

目的　评价18F 脱氧葡萄糖 (FDG)双探头符合线路显像对肺部结节的探测效果。方法用胸部模型作双探头符合显像。结果　符合计数率足够时 ,衰减校正 (AC)和非衰减校正 (NOAC)均能见到≥ 11mm的球体 ,AC的靶 /本底 (T/B)比值小于NOAC ,大结节的T/B值比小结节高。增大T/B值则结节的分辨率提高。随着符合计数率的减低 ,NOAC仅能发现≥ 15mm的球体 ,而AC能发现所有的球体。结论　符合计数率适当时产生的图像最佳 ,AC比NOAC能发现更小的结节。

~(18)F-FDG dual-head gamma camera coincidence imaging of chest phantom

Objective To study the Dual Head Gamma Camera Coincidence(GCC) imaging of chest phantom. Methods The images of chest phantom were acquired with Dual Head Coincidence mode. Results When the coincidence count rate was adequate, the Camera could depict nodules larger than spheres with a diameter of 11 mm with attenuation correction (AC) or non attenuation correction(NOAC). When the target/background (T/B)count rate was elevated , all nodules could be seen in the AC or NOAC images. With the count rate decreasing , the AC could detect all spheres ,but NOAC could only depict spheres with diameter larger than 15 mm. Conclusion In order to improve the detecting effect of the GCC,the injected activity of the 18 F FDG should be suitable to produce a appropriate count rate .In the meantime, comparing with NOAC the AC could detect smaller spheres.