双源CT低剂量扫描在副鼻窦检查中的应用(1)
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[摘要] 目的：探讨双源CT(dual-source computer tomography，DSCT)副鼻窦成像技术的最优剂量及其临床应用的可行性。方法：前瞻性纳入接受副鼻窦检查的成人患者120例，将其随机分为六组，每组20例。分别采用不同管电压和(或)管电流对不同组病例进行副鼻窦DSCT成像，第1组采用120 kV，200 mAs；第2组采用120 kV，100 mAs；第3组采用120 kV，50 mAs；第4组采用100 kV，100 mAs；第5组采用100 kV，50 mAs；第6组采用80 kV，100 mAs。由2名影像科副主任医师以双盲法对所有副鼻窦重建图像进行图像质量评分并取其平均值，对各组的得分情况进行单因素方差分析。由2名主任医师以双盲法将所有重建图像分为以下3等：①无明显伪影的优质图像；②少许伪影，但不影响诊断；③图像质量不能满足诊断要求。对不同组重建图像的质量等级行χ2检验。结果：第1~6组患者所受的辐射剂量依次为24.97、12.48、6.24、7.49、3.74、3.48 mGy。第1~5组图像质量评分差异无统计学意义(P>0.05)；第6组图像质量评分最低，与其他各组比较差异有统计学意义(P<0.05)。第1~5组重建图像均能满足诊断要求，第6组有16例(16/20)的重建图像能满足诊断要求。结论：在副鼻窦DSCT检查中采用恰当的管电流及管电压成像，可以保证图像质量并显著降低患者辐射剂量。
[关键词] 双源CT；副鼻窦；低剂量；体层摄影术
[中图分类号] R445 [文献标识码] B [文章编号] 1673-7210(2011)12(a)-109-03
Application of low-dose dual-source CT scan in paranasal sinuses imaging
YANG Jingyi, CHEN Jiayuan, TAO Keyan
Department of Radiology, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Sichuan Province, Chengdu 610072, China
[Abstract] Objective: To discuss the optimal dose of paranasal sinuses imaging with dual-source computer tomography (DSCT) and its feasibility for clinical application. Methods: 120 patients with the paranasal sinuses scanned using DSCT were prospectively enrolled in this study. These patients were randomly divided into 6 groups, 20 cases in each group. During the paranasal sinuses imaging with DSCT, different radiation doses were applied in each group, Group 1: 120 kV, 200 mAs; group 2: 120 kV, 100 mAs; group 3: 120 kV, 50 mAs; group 4: 100 kV, 100 mAs; group 5: 100 kV, 50 mAs; group 6: 50 kV, 100 mAs. The scores of all reconstructed DSCT images of paranasal sinuses were given by two double blind associate chief physicians of the imaging department ......
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