低剂量自适应迭代重建技术在颅面部联合外伤CT检查中应用

目的 探讨低剂量自适应迭代重建技术在颅面部联合外伤CT检查中应用。方法 选取2019年2月至2021年12月承德市中心医院收治的180例颅面部联合外伤病人，均行常规剂量CT扫描[常规组，最佳噪声指数（noise index,NI）结合30%自适应迭代重建]，在复查CT（与初次扫描间隔<24 h）中按照随机数字表法将病人按照1∶1∶1均分为A组（n=60,NI25结合40%自适应迭代重建）、B组（n=60,NI30结合50%自适应迭代重建）、C组（n=60,NI35结合60%自适应迭代重建），均使用同一设备进行扫描。比较各组扫描时间、受检者剂量容积指数（CT dose index of volume,CTDIvol）、扫描长度（length,L）、剂量长度乘积（dose length product,DLP）、有效剂量（effective dose,ED）、对比信噪比（compare signal-to-noise ratio,CNR）、信噪比（signal-tonoise ratio,SNR）、图像质量主观评价效果。结果 扫描时间：C组

Application of low-dose adaptive iterative reconstruction technique in combined craniofacial trauma CT examinations

Objective To investigate the application of low-dose adaptive iterative reconstruction techniques in combined craniofacial trauma CT examinations.Methods A total of 180 patients with combined craniofacial trauma who were treated in Chengde Central Hospital from February 2019 to December 2021 were selected and underwent conventional dose CT scans [(conventional group, optimal noiseindex (NI) combined with 30 % adaptive iterative reconstruction)], in the re-examination CT (with an interval of less than 24 h from the initial scan), the patients were equally divided into group A (n=60, NI25 combined with 40 % adaptive iterative reconstruction), group B (n= 60, NI30 combined with 50 % adaptive iterative reconstruction), group C (n=60, NI35 combined with 60 % adaptive iterative reconstruction), all were scanned with the same equipment. The scan time, subject dose volume index (CTDIvol), scan length (L), dose length product (DLP), effective dose (ED), contrast signal-to-noise ratio (CNR), signal-to-noise ratio (SNR), subjective evaluation of image quality were compared.Results Scanning time: group C < group A and routine group < group B, the difference was statistically significant (P < 0.05); CTDIvol, DLP, ED: routine group > group A > group B > group C, the difference between the two comparisons was statistically significant (P<0.05); SNR: conventional group > group A > group B > group C, the difference was statistically significant (P < 0.05); Group A(98.33 %), Compared with the conventional group (100.00 %), the satisfaction rate of group B (96.67 %) was not significantly different (P> 0.008); the satisfaction rate of group C (88.33 %) was lower than that of the conventional group (100.00 %) (P<0.008).Conclusion In CT scanning, NI30 combined with 50 % adaptive iterative reconstruction can meet the dual requirements of high quality image and low radiation dose, and can be used as an optimal combination of diagnostic parameters for craniofacial combined trauma.