Impact of 70 kVp Combined with Deep Learning Image Reconstruction on the Quality of Double Low CTA Images After Thoracic Endovascular Aortic Repair
Objective To explore the effect of 70 kVp combined with deep learning image reconstruction(DLIR)algorithm on the image quality of aortic CT angiography(CTA)after thoracic endovascular aortic repair(TEVAR)under low radiation dose and low contrast agent dosage.Methods A total of 65 patients that accepted follow-up aortic CTA after TEVAR were included in the prospective study and were individed into two groups.The conventional protocol group(group A)accepted standard tube voltage of 100 kVp and contrast medium volume of 60 mL,the low-dose group(group B)received a"double low"regimen,tube voltage of 70 kVp and contrast medium dosage of 0.5 mL·kg-1.The images in group A were reconstructed with 50％multiple model adaptive statistical iterative reconstruction-Veo(ASIR-V),and four sets for group B were reconstructed with filtered back projection(FBP)(subgroup B1),50％ASIR-V(subgroup B2),90％ASIR-V(subgroup B3)and DLIR-H(subgroup B4),respectively.CT values,image noise,contrast-to noise ratio(CNR)and FOM of the aorta were measured and compared.The image noise,sharpness and overall image quality were scored on a 5-point scale.Results Subgroup B4 had the lowest noise level,with a reduction of approximately 23.49％compared to group A(P＜0.001).There was no statistically difference in region of interest(ROI)CT values,CNR values and subjective image scores of the aortic between group A and subgroup B4(P＞0.05).FOM value in subgroup B4 was greater than group A(P＜0.001).Compared with group A,group B showed a reduction of approximately 52.38％in radiation dose(P＜0.001),with a decrease of approximately 39％in contrast medium dosage and 33.6％in injection flow rate,respectively(P＜0.001).Conclusion The use of 70 kVp combined with DLIR algorithm can achieve image quality comparable to conventional dose in TEVAR postoperative aortic CTA scanning,and significantly reduce radiation dose and contrast medium dosage.
deep learning image reconstruction algorithmimage processingcomputed tomographyaorta
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