摘要
Abstract
Objective To evaluate the feasibility of using iterative reconstruction technique to reduce the radiation dose of liver computer tomography (CT) scan. Method 120 patients with clinically suspecting liver tumors and need examinated by CT in our hospital from June 2016 to December 2016 were randomly divided into group A, group B, group C and group D, group A and group B patients underwent conventional dose (120 kV, 120 mAs) CT scan, group C and group D patients underwent low dose (120 kV, 80 mAs) CT scan. The technology for image reconstruction of group A and group C were filtered back projection (FBP), and iterative reconstruction was used for group B and group D. CT dose index (CTDI), CT dose length product (DLP), effective radiation dose (ED) and the subjective quality of CT images in each group were recorded and analyzed. To evaluate the feasibility of IR technology to reduce the scanning dose by compared and analyzed the data of each group. Result The CTDI, DLP and ED of group B were significantly lower than those of group A (P<0.01), the CTDI, DLP and ED of group D were significantly lower than those of group C (P<0.01), CNR was significantly higher than that in group C (P<0.01). The noise values of group B and group D were significantly lower than those of group A (P<0.01), and CNR of group B and group D were significantly higher than that of group A (P<0.05). The noise value of group D was significantly lower than that of group C (P<0.01), and CNR was significantly higher than that of group C (P< 0.01). The number of patients with less noise and artifact, higher confidence in diagnosis, more clear display offine structures and lesions in group B and group D were significantly more than those of group A and group C (P<0.05). Conclusion Iterative reconstruction technology could improve the quality of hepatic CT scan image in lower dose than the conventional scanning to meet the requirements of clinical diagnostic, and can significantly reduce the radiation dose of CT scan diagnosis process in the clinical.关键词
迭代重建/计算机断层成像/肝脏/图像噪声/低剂量Key words
Iterative reconstruction/Computer tomography/Liver/Image noise/Low dose
