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目的探讨脊柱椎弓根螺钉内固定术后周围脓肿患者的单能量、双能量CT图像质量差异。方法 27例脊柱椎弓根螺钉内固定术后周围脓肿患者,均行双源CT非增强扫描,扫描完成自动获得100keV和140keV及平均加权120keV图像。将100、140keV图像调入Syngo Dual Energy软件,经Monoenergetic程序处理得到40~190keV连续单能谱图像。选取50、80、110、140keV能谱值图像以及平均加权120keV图像进行多平面重建、最大密度投影及容积再现后处理,评价图像质量。结果平均加权120keV图像质量优良率为40.74%;50、80、110、140keV能量图像质量优良率分别为7.41%、81.48%、96.30%、55.56%;110keV能量图像质量优良率高于平均加权120keV图像及50、80、140keV能量图像,差异均有统计学意义(P<0.05)。结论双源CT双能量扫描技术中110keV能量图像可消除金属伪影,显示脓肿形态,在脊柱椎弓根螺钉内固定术后周围脓肿诊断中具有重要价值。
Objective To investigate the difference of single energy and dual energy CT images in patients with abscess after spinal pedicle screw internal fixation. Methods Twenty - seven patients with peripheral abscess after internal fixation with spinal pedicle screw fixation underwent double - source CT non - enhancement scanning. The images of 100keV and 140keV and average weighted 120keV were automatically obtained after the scan. The 100,140 keV images were loaded into Syngo Dual Energy software and processed by Monoenergetic program to obtain 40 ~ 190 keV continuous single energy spectrum images. 50, 80, 110, 140 keV spectral value images and average weighted 120 keV images were selected for multi-plane reconstruction, maximum density projection and volume rendering post-processing to evaluate the image quality. Results The excellent and good image quality of average energy at 120keV was 40.74%. The excellent and good images of energy at 50,80,110 and 140keV were 7.41%, 81.48%, 96.30% and 55.56% And 50,80,140keV energy images, the differences were statistically significant (P <0.05). Conclusion The 110 keV energy image in dual-source CT dual-energy scanning technique can eliminate metal artifacts and show the morphology of abscess. It is of great value in the diagnosis of peripheral abscess after spinal pedicle screw fixation.