SAFIRE重建联合80kV管电压对甲状腺癌CT检查质量及安全性的影响

目的探讨正弦图确定迭代重建(SAFIRE)联合80kV管电压对甲状腺癌CT检查质量及安全性的影响。方法选取我院疑似甲状腺癌患者(均存在甲状腺结节病变)106例,SAFIRE重建联合80kV管电压检查的53例作为试验组,滤波反投影法重建联合120kV管电压的53例作为对照组。对比两组辐射剂量参数指标有效剂量(ED)、剂量长度乘积(DLP)、容积剂量指数(CTDIvol)]、客观图像质量指标信噪比(SNR)、对比信噪比(CNR)、CT值]水平、主观图像质量评分,以病理检查结果作为“金标准”,分析应用SAFIRE重建联合80kV管电压进行CT检查诊断甲状腺癌的符合率。结果试验组ED、DLP、CTDIvol均低于对照组(P<0.05);两组图像质量均能满足诊断需要,且两组主观图像质量评分相比,差异无统计学意义(P>0.05);两组SNR、CNR、CT值相比,差异无统计学意义(P>0.05);病理检查作为“金标准”,以SAFIRE重建联合80 kV管电压CT检查诊断甲状腺癌的符合率为87.50%(14/16)。结论SAFIRE联合80kV管电压实施甲状腺癌CT检查能降低辐射剂量,保持良好图像质量,诊断符合率高。

Effect of SAFIRE Reconstruction Combined with 80kV Tube Voltage on the Quality and Safety of CT Examination for Thyroid Cancer

Objective To explore the effect of sinogram affirmed iterative reconstruction(SAFIRE)combined with 80 kV tube voltage on the quality and safety of CT examination of thyroid cancer.Methods A total of 106 patients with suspected thyroid cancer(all with thyroid nodules)were selected in our hospital.53 cases of SAFIRE reconstruction combined with 80kV tube voltage inspection were used as the test group,and 53 cases of filtered back projection method reconstruction combined with 120kV tube voltage were used as the control group.The radiation dose parameterseffective dose(ED),dose length product(DLP),CT dose index of volume(CTDIvol)],objective image quality indexsignalnoise ratio(SNR),contrast to noise ratio(CNR),CT value]level,subjective image quality score were compared between the two groups.The pathological results were used as a gold standard to analyze the application of SAFIRE reconstruction combined with 80kV tube voltage for CT diagnosis of the coincidence rate of thyroidectomy.Results ED,DLP,and CTDIvol in the test group were lower than those in the control group(P<0.05).The image quality of the two groups could meet the needs of diagnosis,and there was no statistically significant difference between the two groups of subjective image quality scores(P>0.05).There were no statistically significant difference in SNR,CNR,and CT values between the two groups(P>0.05).Pathological examination was regarded as the gold standard.The coincidence rate of SAFIRE reconstruction combined with 80kV tube voltage CT examination in thyroid cancer diagnosis was 87.50%(14/16).Conclusion SAFIRE combined with 80kV tube voltage for CT examination of thyroid cancer can reduce the radiation dose,maintain good image quality,and have a high diagnostic coincidence rate.