Radiation dose optimization in nasal bone cone beam CT
10.3969/j.issn.1002-1671.2024.10.029
- VernacularTitle:鼻骨锥形束CT辐射剂量的优化研究
- Author:
Jun ZHANG
1
;
Xiaonan HAN
;
Shifei CHEN
;
Hongyu ZHAO
;
Yan SONG
;
Zhiwei ZHONG
;
Wenjuan WU
;
Huizhao WU
Author Information
1. 河北医科大学第三医院放射科,河北 石家庄 050051
- Keywords:
cone beam computed tomography;
nasal bone;
low-dose
- From:
Journal of Practical Radiology
2024;40(10):1702-1706
- CountryChina
- Language:Chinese
-
Abstract:
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,resul-ting 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)Signifi-cant 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 differ-ent dose modes and resolutions(P＜0.05).The XS body type exhibited the highest SNR and FOM values and the lowest noise.The 200 μm resolution demonstrated the higher CNR value and the highest SNR value,with moderate noise and FOM value.(3)Signifi-cant differences in image quality,contrast,sharpness,and noise were observed among different dose modes,body types,and resolu-tions(P＜0.05).Higher subjective scores were assigned to the 200 μm and 150 μm resolutions,indicating clear anatomical details.Conclusion The scanning parameters of 200 μm 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.
