呼吸训练对肺部磁共振自由呼吸成像序列图像质量的影响  

Effect of breathing training on image quality of MR lung free respiratory imaging sequence

作　　者：江叶海 党珊 蒲豆豆 张丽 王少彧 于楠 JIANG Ye-hai;DANG Shan;PU Dou-dou;ZHANG Li;WANG Shao-yu;YU Nan(School of Medical Technology,Shaanxi University of Chinese Medicine,Xianyang Shaanxi 712046,China;Medical Imaging Department,Affiliated Hospital of Shaanxi University of Chinese Medicine,Xianyang Shaanxi 712000,China;Magnetic Resonance Research Department of Siemens Medical Systems Co.,Ltd.,Shanghai 201318,China)

机构地区：[1]陕西中医药大学医学技术学院,陕西咸阳7712046 [2]陕西中医药大学附属医院医学影像科,陕西咸阳712000 [3]西门子医疗系统有限公司磁共振科研部,上海201318

出　　处：《中国临床医学影像杂志》2025年第1期19-23,共5页Journal of China Clinic Medical Imaging

基　　金：陕西科技厅基础研究项目(2022JM-453);国家级大学生创新创业训练计划(202210716013)。

摘　　要：目的:探讨呼吸训练对改善肺部MRI自由呼吸序列图像质量的价值。方法:前瞻性收集2022年6月—2023年6月拟接受肺部MRI检查的42例患者,按照患者年龄、性别、病变位置进行匹配,然后随机将患者分为实验组和对照组。在检查前,操作者告知患者噪音、发热、检查时间等信息。对照组接受常规的检查前准备,实验组患者在检查前30 min通过视诊方法评估患者呼吸状态。对于呼吸规律的患者继续按照现有的节奏呼吸。对于呼吸不规律的患者,操作者在一旁指导患者吸气呼气,训练持续2 min。如果呼吸仍不规律,操作者继续进行呼吸训练,将时间延长至5 min。采集所有患者的星状容积内插屏气检查(star Volumetric interpolated breath-hold examination,star VIBE)和螺旋超短回波时间(spiral Ultra-short time echo,spiral UTE)图像。两名高年资医师在不知道分组的情况下,采用5分法对肺部MRI图像进行主观图像质量评价。测量升主动脉、肺动脉干、降主动脉的信号强度(Signal intensty,SI)及标准差(Standard deviation,SD),根据信噪比(Signal to noise ratio,SNR)和SI变异系数(Coefficient of variation,CV)公式计算SNR和CV值,比较实验组和对照组的客观图像质量。结果:实验组的血管清晰度、支气管清晰度、噪声和伪影以及整体图像质量的评分均高于对照组(P<0.05)。在客观图像质量评价中,实验组升主动脉、肺动脉干、降主动脉层面的SNR值均高于对照组(P<0.05),CV值均低于对照组(P<0.05)。结论:呼吸训练能改善自由呼吸序列的图像质量,提高了检查成功率和舒适度。Objective:To explore the value of respiratory training in improving the image quality of pulmonary MRI of free breathing.Methods:A total of 42 patients who were scheduled to undergo pulmonary MRI examination from June 2022 to June 2023 were prospectively collected and matched according to their age,gender and location of lesions,and then the patients were randomly divided into experimental group and control group.Before the examination,the operator informed the patient of the noise,fever,examination time and other information.The control group received routine preparation before examination.The respiratory status of the patients in the experimental group was evaluated by visual inspection methods 30 min before examination.For patients with regular breathing,the operator told the patient to continue to breathe at the current rhythm.For patients with irregular breathing,the operator instructed the patient to inhale and exhale for 2 minutes.If breathing was still irregular,the operator continued breathing training and extended the time to 5 minutes.The star volumetric interpolated breath-hold examination(star VIBE)and spiral ultra-short echo time(spiral UTE)images of all patients were collected.Without knowing the grouping,two senior doctors used the five-point method to subjectively evaluate the image quality of lung MRI images.The signal intensity(SI)and standard deviation(SD)of ascending aorta,pulmonary trunk and descending aorta were measured.According to the formulas of signal to noise ratio(SNR)and coefficient of variation(CV),the SNR and CV values were calculated,and the objective image quality between the experimental group and the control group were compared.Results:The scores of vascular clarity,bronchial clarity,noise and artifacts and overall image quality in the experimental group were higher than those in the control group(P<0.05).In the objective image quality evaluation,the SNR values of ascending aorta,pulmonary trunk and descending aorta in the experimental group were higher than those in the contr

关 键 词：呼吸 肺 磁共振成像 

分 类 号：R56[医药卫生—呼吸系统] R445.2[医药卫生—内科学]