摘要
目的探讨能谱纯化技术(SPS)、器官剂量调制技术(OBTCM)以及两者结合对婴幼儿头部CT扫描器官剂量及图像质量的影响。方法利用两个头部仿真体模(CIRS 1岁和5岁),分别采用参考扫描模式(Reference)、Reference+OBTCM、SPS及SPS+OBTCM 4种模式进行扫描;测量并比较不同体模不同扫描模式眼晶状体、脑部前侧及脑部后侧的辐射剂量,眼眶和脑实质区域的噪声水平及对比噪声比(CNR)。结果相比Reference模式,1岁与5岁体模的眼晶状体剂量在Reference+OBTCM模式分别减少约(21.89±0.01)%和(28.33±0.34)%;在SPS模式下,1岁和5岁体模的眼晶状体剂量减少分别为(71.38±1.30)%和(53.72±2.42)%;SPS+OBTCM模式分别减少约(71.12±2.54)%和(55.73±1.90)%。不同体模不同扫描模式眼眶及脑实质的噪声水平,差异有统计学意义(F=5.67~85.47,P<0.05);与Reference模式相比,Reference+OBTCM模式的噪声水平在不同体模不同部位中略有增加(<1.45HU),而SPS和SPS+OBTCM模式产生较小的噪声增加(<2.58 HU);不同体模不同扫描模式不同部位的CNR差异无统计学意义(P>0.05)。结论SPS和SPS+OBTCM模式可以显著降低婴幼儿头部CT扫描中眼晶状体及整个图像平面的辐射剂量,同时保持图像质量。
Objective To compare the dose and image quality of selected photon shield(SPS)technique,organ-based tube current modulation(OBTCM)technique and the combination of these two techniques for reducing the organ dose in head CT examination for infants.Methods Two anthropomorphic head phantoms(CIRS 1-yr-old and 5-yr-old)were scanned by using Reference mode,Reference+OBTCM mode,SPS mode and SPS+OBTCM mode,respectively.Radiation doses to the lens of the eye,the anterior of the brain,the posterior of the brain,noise level and CNR of orbit and brain in different phantoms were measured and compared by using different scanning modes.Results Compared with Reference mode,the doses to the lens of the eye in 1-yr-old and 5-yr-old phantom decreased by(21.89±0.01)%and(28.33±0.34)%,respectively.In SPS mode,the reduction in doses to the lens of the eye in 1-yr-old and 5-yr-old phantom were(71.38±1.30)%and(53.72±2.42)%,respectively.In SPS+OBTCM mode,the reduction was(71.12±2.54)%and(55.73±1.90)%,respectively.There was significant difference in the noise level of orbit and brain in different phantoms under various scanning modes(F=5.67-85.47,P<0.05).The noise level in OBTCM mode compared with reference mode increased slightly(<1.45 HU)in various phantoms.SPS and SPS+OBTCM mode resulted in a small noise increase(<2.58 HU).There was no significant difference in CNR of different phantoms under various scanning modes(P>0.05).Conclusions SPS and SPS+OBTCM mode can significantly reduce the radiation dose of lens and the whole image plane in the head CT scan for infants,with maintaining the image quality.
作者
袁子龙
刘涛
张彪
陈迢
李翠玲
张照喜
吴磊
Yuan Zilong;Liu Tao;Zhang Biao;Chen Tiao;Li Cuiling;Zhang Zhaoxi;Wu Lei(Department of Clinical Medicine,Medical College,Wuhan University of Science and Technology,Wuhan,430065,China;Department of Radiology,Hubei Cancer Hospital,Tongji Medical College,Huazhong University of Science and Technology,Wuhan 430079,China;Department of Radiological Health,Wuhan Hospital for the Prevention and Treatment of Occupational Disease,Wuhan 430015,China)
出处
《中华放射医学与防护杂志》
CAS
CSCD
北大核心
2022年第3期225-229,共5页
Chinese Journal of Radiological Medicine and Protection
关键词
能谱纯化
器官剂量
辐射剂量
眼晶状体
计算机体层成像
Selected photon shield
Organ-based tube current modulation
Radiation dose
Eye lens
Computed tomography
