Objective To investigate the value of the nomogram based on quantitative parameters of dual-layer detector spectral CTand conventionalCT features in preoperatively predicting tumor deposits(TDs)in colorectal cancer.Me...Objective To investigate the value of the nomogram based on quantitative parameters of dual-layer detector spectral CTand conventionalCT features in preoperatively predicting tumor deposits(TDs)in colorectal cancer.Methods This study was acasecontrol study.A total of 126 patients with pathologically confirmed colorectal cancer who underwent preoperative spectral CT scan from January 2022 to March 2023 in the First Affiliated Hospital of Soochow University were enrolled retrospectively.Patients were divided into TDspositive group(n=38)and TDs-negative group(n=88)based on pathological results.The following conventional CT features were assessed:cT stage,cN status,uniformity of enhancement in the venous phase,pericolorectal fat invasion(PFI),maximum tumor diameter,and tumor location.The following quantitative parameters were also measured andcalculated:theenormalizediodine concentration(NIC)of lesions,the normalized effective atomic number(NZerr),and the slope of the 40-100 keV spectral curve(K)in the arterial and venous phases,and the difference in NIC between the arterial and venous phases.展开更多
文摘Objective To investigate the value of the nomogram based on quantitative parameters of dual-layer detector spectral CTand conventionalCT features in preoperatively predicting tumor deposits(TDs)in colorectal cancer.Methods This study was acasecontrol study.A total of 126 patients with pathologically confirmed colorectal cancer who underwent preoperative spectral CT scan from January 2022 to March 2023 in the First Affiliated Hospital of Soochow University were enrolled retrospectively.Patients were divided into TDspositive group(n=38)and TDs-negative group(n=88)based on pathological results.The following conventional CT features were assessed:cT stage,cN status,uniformity of enhancement in the venous phase,pericolorectal fat invasion(PFI),maximum tumor diameter,and tumor location.The following quantitative parameters were also measured andcalculated:theenormalizediodine concentration(NIC)of lesions,the normalized effective atomic number(NZerr),and the slope of the 40-100 keV spectral curve(K)in the arterial and venous phases,and the difference in NIC between the arterial and venous phases.