摘要
目的 探讨器官有效调制技术(the effect of organ effective modulation,OEM)在胸部CT扫描中对图像质量和辐射剂量的影响.方法 前瞻性纳入46名胸部增强病人(男25例,女21例).动脉期扫描时使用佳能640层CTOEM技术(OEM组),延迟期关闭OEM(常规组),其余扫描条件保持一致.对比两组辐射剂量及主、客观图像质量的差异.结果 OEM组CDTI降低了3.9％(5.84 vs 6.08 P值＜0.0001),DLP降低了4.4％(219.36 vs 229.52 P值＜0.0001),辐射剂量降低了4.3％(3.07 vs 3.21 P值＜0.0001),但OEM组客观图像质量较常规组有所降低(噪声7.9 vs 6.24 P值＜0.0001),主观图像质量两组评估均满足诊断需求且两组间观察者间一致性表现良好.结论 OEM技术在胸部CT扫描中单期辐射剂量可降低4％,多期扫描辐射剂量可降低8％～12％,客观图像质量有所下降但不影响图像诊断的可接受性.
Abstract
Objective To investigate the effect of organ effective modulation on subjective and objective image quality and radiation dose of chest computed tomography(CT).Methods This retrospective study included 46 patients with chest enhancement were prospectively included,All patients turned on OEM technology during arterial phase scanning,Control tube current through angle longitudinal modulation technology and OEM Technology(OEM group),Turn off OEM during delay scan(general group),The tube current is controlled by angle longitudinal modulation technology,The other scanning conditions such as kV,pitch,ball tube rotation time and detector row number remain the same.The radiation dose,subjective image quality and objective image quality were compared between the two groups.Results The arterial phase of opening OEM technology in the same patient was compared with the delayed phase of not using OEM,CDTI decreased by 3.9％(5.84 vs 6.08,P＜0.0001),DLP decreased by 4.4％(219.36 vs 229.52,P＜0.0001),and radiation dose decreased by 4.3％(3.07 vs 3.21,P＜0.0001).However,the objective image quality of OEM group was lower than that of conventional group(noise 7.9 vs 6.24,P＜0.0001),but the subjective image quality evaluation of the two groups met the diagnostic needs.Conclusion In chest CT scanning,OEM technology can reduce the radiation dose by about 4％without affecting the acceptability of image diagnosis.Using OEM technology for all phases can reduce the radiation dose by approximately 12％.
基金项目
云南省万人计划名医专项(YNWR-MY-2019-011)
维普
万方数据