Value of low-dose and optimized-length computed tomography (CT) scan in CT-guided percutaneous trans

• 作 者: Hui Yuan Da Li Yan Zhang Xiaozhen Xie Lujun Shen
• 机 构: Sun Yat-sen University Cancer Center,China;State Key Laboratory of Oncology in South China,Collabora
• 出 处: 介入医学杂志（英文）
• 发表日期: 2021年3期
• 关键词: Lung biopsy CT guided Low dose Radiation dose Optimized scan

Objective:To investigate the value of application of low-dose and optimized length CT scan on puncture results,complications and patients\' radiation dosage during CT-guided percutaneous biopsy of pulmonary nodules(PTNB).Methods:A total of 231 patients with PTNB under CT guidance were collected.Low dose scanning utilized tube current of 20 mA as compared with 40 mA in conventional dosage.Optimized length in CT is defined as inten-tionally narrowing the range of CT scanning just to cover 25 mm (5 layers) around the target layer during needle adjustment.According to whether low-dose scans and optimized length scans techniques were utilized,patients were divided into three groups:conventional group (conventional sequence + no optimization),optimized length group (conventional sequence + optimized length),and low-dose optimized length group (low dose sequence +optimized length).The ED (effective dose),the DLP (dose length product),the average CTDIvol (Volume CT dose index),total milliampere second between subgroups were compared.Results:Compared with the conventional group,ED,intraoperative guidance DLP,total milliseconds and opera-tion time in the optimized length group were reduced by 18.2％ (P=0.01),37％ (P=0.003),17.5％ (P=0.013) and 13.3％ (P=0.021) respectively.Compared with the optimized length group,the ED was reduced by 87％,pre-operative positioning,intraoperative guidance and postoperative review DLP were also reduced by 88％,total milliampere second was reduced by 79％,with an average CTDIvol was reduced by 86％,in the low-dose opti-mized length group (P＜0.001 for all).Conclusion.:Optimizing the length during CT scanning can effectively reduce the intraoperative radiation dose and reduce the operation time compared with conventional plan;low-dose and optimized length CT scan can further reduce the total radiation dose compared with optimized length group with no differences on intraoperative complications,biopsy results and operation time.