Analysis of the Value of GSI Scanning Combined with"Double-low"Technology in Head and Neck CTA in Middle-aged and Elderly Individuals
ZHANG Xiaolong
ZHAO Yingming
ZHANG Guoxiang
WEI Fangsheng
CHEN Cheng
Abstract：Objective:This study aimed to investigate the value of gemstone spectral imaging(GSI)scanning combined with"double-low"technology in head and neck computed tomography angiography(CTA)in middle-aged and elderly individuals.Materials and Methods:One hundred fifty patients who underwent head and neck CTA from February to December 2023 were retrospectively collected and divided into three groups,comprising 50 patients each,according to different scanning modalities;A,B,and C.Groups A and B underwent conventional spiral scans,with tube voltages of 120 kV and 100 kV,respectively,and tube currents of 300～500 mA were automatically modulated,and the dose and flow rate of the contrast agent were fixed at 55 mL,4.5 mL/s,saline with the same dose and flow rate for flushing and group C energy spectrum scanning,the tube voltage of the flat scanning group was 80 kV,the tube voltage of the enhancement group was 80～140 kV instantaneous switching,and the tube current was a constant 320 mA in all cases,with a personalized contrast agent injection scheme.The subjective evaluation,objective evaluation,and comparison of contrast use dose were performed on the imaging data of all groups.Results:The mean CT values of head and neck vessels in group B were greater than those in groups A and C,with statistically significant differences.At the aortic arch level,the SNR and CNR parameters in group B were better than those in groups A and C,with statistically significant differences.At the level of the remaining blood vessels,the SNR,CNR,and SD parameters of group C were better than those in groups A and B,excluding the common carotid artery level,with statistically significant differences.The radiation dose in group C was 53.9%and 27.6%lower than that in groups A and B,respectively,and the contrast dose was 27.2%lower.Conclusion:In middle-aged and elderly individuals,head and neck CTA with GSI scanning combined with"double-low"technique can effectively reduce radiation and contrast doses and improve image quality.
Keywords：computed tomography angiographyenergy spectrum single energyradiation dosecontrast agent
Publication Date：2025-03-31
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 295-302 )