Feasibility of Low-kV Sinogram Affirmed Iterative Reconstruction in Thyroid CT Examination
10.3969/j.issn.1005-5185.2017.12.003
- VernacularTitle:低管电压联合迭代重建技术在甲状腺CT检查中的可行性
- Author:
Wen CHANG
1
;
Wen ZHAO
;
Shasha SHEN
;
Dan HAN
Author Information
1. 昆明医科大学第一附属医院影像科 云南昆明 650032
- Keywords:
Thyroid diseases;
Tomography,X-ray computed;
Algorithms;
Iterative reconstruction;
Radiation dosage
- From:
Chinese Journal of Medical Imaging
2017;25(12):889-891,893
- CountryChina
- Language:Chinese
-
Abstract:
Purpose To explore the feasibility of low-kV sinogram affirmed iterative reconstruction (SAFIRE) in thyroid CT examination.Materials and Methods Eighty patients who had taken thyroid examination through dual-source dual-energy CT were retrospectively analyzed and were divided into group A,B and C according to different tube voltages.Group A was with linear fusion (equal to 120 kV),group B 100 kV combined with SAFIRE and group C 80 kV combined with SAFIRE.CT value,signal noise ratio (SNR),contrast noise ratio (CNR),background noise and subjective scoring of normal and lesion thyroid tissues during arterial and venous phase of images in the three groups were compared.Image nodular morphology (irregular shapes,enhanced ring around the tumor,gravel calcification and segmental defects) in the three groups were analyzed to diagnose difference of sensitivity,specificity and accuracy of the malignant nodules.Results Background noise in group B and C during arterial and venous phase and CT value of normal thyroid and lesion tissues were both higher than those of group A.The difference was of statistical significance (P＜0.01).Difference of SNR and CNR of normal thyroid during arterial phase,CNR of lesion tissues in group A and C and normal thyroid CNR and lesion tissues SNR during venous phase was of no statistical significance (P＞0.05) and all were higher than those of group B.SNR difference of normal thyroid during venous phase in each group was of statistical significance (P＜0.05) and value in group C was the highest.Subjective scoring in group B and C and sensitivity and accuracy used for malignant thyroid nodules diagnosis were of no statistical difference (P＞0.05) and all were higher than that of group A.Conclusion Low-kV SAFIRE can ensure image quality and diagnostic accuracy improvement as well as radiation dose reduction for thyroid CT examination.
