鼻骨锥形束CT辐射剂量的优化研究  

Radiation dose optimization in nasal bone cone beam CT

作　　者：张均[1] 韩晓楠 陈诗飞 赵宏宇 宋岩[1] 钟志伟[1] 吴文娟[1] 吴慧钊[1] ZHANG Jun;HAN Xiaonan;CHEN Shifei;ZHAO Hongyu;SONG Yan;ZHONG Zhiwei;WU Wenjuan;WU Huizhao(Department of Radiology,the Third Hospital of Hebei Medical University,Shijiazhuang 050051,China)

机构地区：[1]河北医科大学第三医院放射科,河北石家庄050051

出　　处：《实用放射学杂志》2024年第10期1702-1706,共5页Journal of Practical Radiology

基　　金：河北省卫生健康委员会重点科技研究计划(20211623);河北省卫生健康委员会医学适用技术跟踪计划项目(GZ2022036)。

摘　　要：目的探讨鼻骨锥形束CT(CBCT)的适宜扫描参数,实现鼻骨CBCT的低剂量扫描。方法使用普兰梅卡CBCT 3D单牙序列,以2种剂量协议、5种体型、5种分辨率共50个扫描序列对2个人体等效体模进行鼻骨扫描,记录其剂量面积乘积(DAP)和容积CT剂量指数(CTDIvol)。于矢状位图像设置感兴趣区(ROI)计算ROI对比噪声比(CNR)、信噪比(SNR)、噪声及图像品质因子(FOM)进行图像质量客观评分,以5级李克特量表进行主观评分,比较分析不同扫描参数下检查剂量及成像质量的差异。结果(1)不同剂量模式、不同体型、不同分辨率DAP差异有统计学意义(P<0.05),其中XS体型的DAP值最小。(2)不同剂量模式、不同分辨率CNR、SNR、噪声及FOM差异均有统计学意义(P<0.05),XS体型的SNR值及FOM值最高,噪声最低,200μm分辨率的CNR值较高,SNR值最高,噪声及FOM值适中。(3)不同剂量模式、不同体型、不同分辨率下图像质量、对比度、锐利度、噪声差异均有统计学意义(P<0.05),200μm和150μm分辨率的主观评分较高,图像解剖细节显示清晰。结论超低剂量协议下XS体型200μm分辨率的扫描参数实现了低辐射剂量与高图像质量的平衡,适宜进行低剂量鼻骨CBCT检查。Objective To investigate the optimal scanning parameters for cone beam computed tomography(CBCT)of the nasal bone,to achieve low-dose scanning of the nasal bone CBCT.Methods Utilizing Prangmerka CBCT 3D single-tooth sequence,nasal bone scans were performed on two human-equivalent phantoms using two dose protocols,five body types,and five resolutions,resulting in 50 scanning sequences.The dose area product(DAP)and volume CT dose index(CTDIvol)were recorded.Objective image quality assessment was conducted by calculating the contrast-to-noise ratio(CNR),signal-to-noise ratio(SNR),noise,and figure of merit(FOM)in region of interest(ROI)set on sagittal images.Subjective scoring was performed using a five-point Likert scale.Differences in radiation dose and image quality among various scanning parameters were compared and analyzed.Results(1)Significant differences in DAP were observed among different dose modes,body types,and resolutions(P<0.05),with the lowest DAP values recorded for the XS body type.(2)Statistically significant differences in CNR,SNR,noise,and FOM were found among different dose modes and resolutions(P<0.05).The XS body type exhibited the highest SNR and FOM values and the lowest noise.The 200μm resolution demonstrated the higher CNR value and the highest SNR value,with moderate noise and FOM value.(3)Significant differences in image quality,contrast,sharpness,and noise were observed among different dose modes,body types,and resolutions(P<0.05).Higher subjective scores were assigned to the 200μm and 150μm resolutions,indicating clear anatomical details.Conclusion The scanning parameters of 200μm resolution combined with an ultra-low-dose protocol for the XS body type achieve a balance between low radiation dose and high image quality,making them suitable for low-dose nasal bone CBCT examinations.

关 键 词：锥形束CT 鼻骨 低剂量 

分 类 号：R814.42[医药卫生—影像医学与核医学] R816.1[医药卫生—放射医学] R144.1[医药卫生—临床医学]