Dual-low dose protocol combined with iterative model reconstruction in CT angiography of ophthalmic artery
10.13929/j.issn.1672-8475.2025.06.009
- VernacularTitle:双低剂量方案联合全模型迭代重建用于眼动脉CT血管成像
- Author:
Qi GUO
1
;
Xuening ZHANG
;
Guohua FAN
;
Dai SHI
Author Information
1. 天津医科大学第二医院医学影像科,天津 300211
- Publication Type:Journal Article
- Keywords:
ophthalmic artery;
computed tomography angiography;
radiation dosage;
contrast media;
iterative reconstruction
- From:
Chinese Journal of Interventional Imaging and Therapy
2025;22(6):409-412
- CountryChina
- Language:Chinese
-
Abstract:
Objective To observe the value of dual-low dose protocol(low tube voltage and low contrast agents)combined with iterative model reconstruction(IMR)in CT angiography(CTA)of ophthalmic artery.Methods Totally 100 patients who underwent head and neck CTA were retrospectively enrolled and divided into observation group(n=50,dual-low dose protocol+IMR)and control group(n=50,conventional protocol+filtered back projection[FBP]).Subjective and objective evaluations on image quality were performed,radiation doses and dosage of contrast agents were calculated,and the outcomes were compared between groups.Results Signal-to-noise ratio(SNR)and contrast-to-noise ratio(CNR)of ophthalmic artery on CTA were both higher(both P＜0.001),while noise(SD)of optic nerve,volume CT dose index(CTDIvol),dose-length product(DLP)and effective dose(ED)in observation group were all lower than those in control group(all P＜0.001).No significant difference of subjective scoring of image quality,CT values of ophthalmic artery nor optic nerve was found between groups(all P＞0.05).Compared with control group,CTDIvol,DLP,ED,iodine dosage and iodine flow rate in observation group decreased by 69.85%,70.17%,70.28%,43.24%and 43.24%,respectively.Conclusion Dual-low dose protocol combined with IMR could reduce radiation dose and contrast agents dosage in CTA of ophthalmic artery under the condition of ensuring image quality.
