Low energy targeted reconstruction combined with adaptive statistical iterative reconstruction-Veo in venography of lower extremity
10.3969/j.issn.1002-1671.2024.05.030
- VernacularTitle:低能级靶重建结合自适应统计迭代重建算法在下肢静脉成像中的应用
- Author:
Shigeng WANG
1
;
Xin FANG
;
Yijun LIU
;
Beibei LI
;
Xu WANG
;
Yong FAN
;
Xiaoyu TONG
;
Wei WEI
Author Information
1. 大连医科大学附属第一医院放射科,辽宁 大连 116011
- Keywords:
deep venous thrombosis;
targeted reconstruction;
adaptive statistical iterative reconstruction-Veo
- From:
Journal of Practical Radiology
2024;40(5):809-813
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the application value of energy spectral CT low energy(keV)targeted reconstruction tech-niques combined with adaptive statistical iterative reconstruction-Veo(ASIR-V)algorithm in lower extremity computed tomography venography(CTV).Methods Forty patients with lower extremity CTV examination were retrospectively selected.Gemstone spec-tral imaging(GSI)mode was used with a transient tube voltage of 80 kVp/140 kVp and tube current in GSI Assist mode.Group A(conventional group):70 keV combined with 40％ASIR-V mono-energy images,conventional display field of view(DFOV)inclu-ding both lower extremity.Group B(low keV group):50 keV combined with 50％ASIR-V mono-energy images,DFOV as in group A.Group C(low keV targeted reconstruction group):50 keV combined with 50％to 80％ASIR-V mono-energy images(10％interval,called as groups C1-C4),targeted reconstruction(small DFOV,covered one lower extremity with left and right femurs as the center).The CT and standard deviation(SD)values of the bilateral lower extremity veins were measured on each axial image and the signal-to-noise ratio(SNR)and contrast-to-noise ratio(CNR)were calculated.Two observers scored the venous images and the sharpness of embolus display subjectively using a 5-point scale and Kappa test was used to examine the consistency.Results In terms of vein dis-play,the score of groups B and C was better than that of group A(P＜0.05).In terms of embolus display sharpness,the scores of large and small embolus in group C increased with the increase of ASIR-V percentage initially and then gradually decreased(P＜0.05).The scores in group C2 were the highest which were superior to the scores of group B and group A(P＜0.05).The CT values of each venous segment in groups B and C were higher than those in group A(P＜0.05).In groups C1 to C4,with the increasing weight of ASIR-V,the SNR and CNR increased gradually(P＜0.05),but slightly lower than those in group B(P＜0.05).Conclusion 50 keV targeted reconstruction techniques combined with 60％ASIR-V algorithm significantly improves the contrast of lower extremity veins and the embolus display sharpness,providing more accurate clinical imaging information.
