Multilayer Spiral CT Double Low Technique Scanning in Pulmonary Artery Vascular Imaging
多层螺旋CT双低技术扫描在肺动脉血管成像中的应用

摘要

目的 分析多层螺旋CT肺动脉血管成像中使用双低技术扫描的效果。方法 ①体模试验：制备肺血管模型，多层螺旋CT扫描，分析CNR。②人体试验：从2021年5月-2022年5月疑似肺动脉栓塞患者中随机抽取52例，双盲法均分为A组（常规扫描）、B组（双低技术扫描），分析图像质量。结果 管电流相同管电压不同、碘浓度不同扫描图像的CNＲ均无太大变化（p＞0.05）；B组图像质量评分、CT值（左、右肺动脉、左上叶肺动脉）、肺动脉主干（CT值、CNR、SNR）和A组差异较小（p＞0.05）；B组静脉污染评分、CTDIvol、DLP、碘摄入量优于A组（P＜0.05）。结论 多层螺旋CT肺动脉血管成像中使用双低技术扫描，能得到理想的图像质量，具有更高的安全系数，可用于诊断PE。

Abstract

Objective To analyze the effect of double low technique scanning in multi-slice spiral CT pulmonary angiography.
Methods ① Phantom test: pulmonary vascular model was prepared, and multi-slice spiral CT scan was performed to analyze CNR.② Human study: From May 2021 to May 2022, 52 patients with suspected pulmonary embolism were randomly selected and divided into group A (conventional scanning) and group B (double low-technology scanning) by double-blind method. Image quality was analyzed.
Results The CNR and SNR of the same tube current and different tube voltage and iodine concentration had no significant change (p > 0.05). The image quality score, CT value (left and right pulmonary artery, left upper pulmonary artery), main pulmonary artery (CT value, CNR) of group B and group A had little difference (p>0.05). The venous contamination score, CTDIvol, DLP and iodine intake in group B were better than those in group A (P < 0.05).
Conclusion   The use of double-low technique in MSCT pulmonary angiography can obtain ideal image quality and has higher safety factor, which can be used in the diagnosis of PE.