摘要
目的探讨非镇静状态下160 mm宽体探测器轴扫描模式在婴幼儿胸部CT检查中的临床应用价值。方法将100例行常规胸部CT检查的婴幼儿随机分为2组进行前瞻性研究,A组(n=50)在非镇静状态下行160 mm轴扫描,B组(n=50)在自然睡熟或接受水合氯醛镇静熟睡后行80 mm螺旋扫描。由2名有经验的放射科医师采用4级评分制对两组图像质量进行主观评分。测量纵膈窗左心房的CT值和SD值并计算信噪比(Signal to Noise Ratio,SNR),评价客观图像质量。记录每例患儿的扫描时间、容积CT剂量指数(Volume CT Dose Index,CTDIvol)和剂量长度乘积(Dose Length Product,DLP),并计算有效辐射剂量(Effective Dose,ED)。结果两组图像的主观质量评分和SNR无明显统计学差异(P>0.05)。两组病例的扫描时间存在显著差异(P<0.001)。A组CTDIvol(1.18±0.24 mGy)与B组CTDIvol(1.33±0.30 mGy)存在统计学差异(P=0.01)。A组的ED值(0.61±0.17 mSv)较B组ED值(0.89±0.25 mSv)降低了31.4%,具有明显统计学差异(P<0.001)。结论160 mm宽体探测器轴扫描速度快,辐射剂量低,无需对患儿进行镇静即可完成胸部CT成像,且不影响图像质量,具有良好的临床应用价值。
Objective To investigate the clinical application value of 160 mm wide detector axial scanning mode in chest CT examination of children under non sedative state.Methods A total of 100 children with routine chest CT examination were randomly divided into two groups for prospective study.In A group(n=50),the patient underwent axial scanning mode with 160 mm detector.In B group(n=50),the patient was natural sleep or sedated by chloral hydrate for the CT examination with 80 mm detector helical scanning mode.Subjective image quality was independently assessed by 2 radiologists based on a score system.CT number and standard deviation(SD)in the left atrium were measured to calculate signal to noise ratio(SNR).The scanning time,volume CT dose index(CTDIvol)and dose length product(DLP)of each patient were recorded,and the effective dose(ED)was calculated.Results There was no significant difference in subjective quality score and SNR between the two groups(P>0.05).There was significant difference in mean scan time between A group and B group(P<0.001).CTDIvol(1.18±0.24 mGy)in A group was significantly different from that in B group(1.33±0.30 mGy)(P=0.01).The ED value of A group(0.61±0.17 mSv)was 31.4%lower than that of B group(0.89±0.25 mSv),with significant statistical difference(P<0.001).Conclusion The 160 mm wide body detector has the advantages of fast axial scanning speed,low radiation dose,no need to sedate the children to complete chest CT imaging,and does not affect the image quality,so it has good clinical application value.
作者
庄勋慧
李杨
宋庆花
宋修峰
ZHUANG Xunhui;LI Yang;SONG Qinghua;SONG Xiufeng(Department of Radiology,Qingdao Women and Children’s Hospital,Qingdao Shandong266034,China)
出处
《中国医疗设备》
2020年第11期110-112,117,共4页
China Medical Devices
