16排螺旋CT胸部低剂量扫描的图像质量分析  

Image quality analysis of 16 - slice spiral CT low - does chest scans

作　　者：邹才盛[1] 孔彪[1] 

机构地区：[1]广西北海市人民医院,536000

出　　处：《中国医学创新》2010年第31期175-176,共2页Medical Innovation of China

摘　　要：目的 探索16排螺旋CT低剂量扫描应用于胸部的可行性和合理性.方法 随机选择100例肺部CT扫描病例,用Philips 16 MSCT分两组扫描,每组50例：一组常规扫描（120 KV、250 MA、层厚2 mm）,一组低剂量扫描（120 KV、100 MA、层厚2 mm）.分别记录扫描时间（T）、CT剂量指数（CTDI）、Z轴扫描范围（L）、剂量长度（DLP）乘积.对所有图像进行三维成像（3D）、最小密度投影（MIP）、多平面重建（MPR）等处理.由5名放射科从事CT诊断5年以上的医生进行盲法评价图像质量.对两组图像的清晰度、是否有伪影、伪影对诊断的影响作评判,并进行统计学处理.结果 不同扫描剂量条件下质量统计差异无统计学意义.胸部低剂量CT扫描组的图像的清晰度与常规CT扫描的没有太大的差别.胸部低剂量CT扫描组的图像产生伪影共5例,但伪影对诊断几乎没有影响.而两组剂量长度（DLP）乘积比较差异具有统计学意义.结论 16排螺旋CT低剂量扫描在胸部的合理应用,既可以有效地保护病人,又能保证图像质量.使CT的应用范围更加广泛.Objective Explores 16 row of screw CT low dose scanning to apply in the chest feasibility and the rationality. Methods The random selection 100 example longs CT scanning case, is divided two groups with Philips 16 MSCT to scan, each group of 50 examples： A group of conventional scanniug （ 120KV, 250MA, level thick 2mm）, a grnup of low dose scanning （ 120KV, 100MA, level thick 2mm）. Distinction record trace time （T） , CT dosage index （CTD1） , Z axis swath range （L） , dosage length （DLP） product. Carries on the three dimensional image formation to all images （3D） , the smallest density projection （ MIP）, the multilevel reeonstruction （MPR） and so on processing. Is engaged in CT by 5 radiology to diagnose 5 year ahove doctor to carry on the hlind method appraisal picture quality. To two group of image clarity, whether to have the false shade, the false shade the influence to make the judgment to the diagnosis, and carries on statistics processing. Resuhs Under different scanning dosage condition quality statistics difference non - statistics significance. Chest low dose CT scanning group＇s image clarity and conventional CT scanning not too big difference. The chest low dose CT scanning grnop＇s image has the false shade altogether 5 examples, but the false shade to diagnoses has not affected nearly. But two grnup of dosage lengths （DLP） the product comparison difference has statistics significance. Conclusion 16 row of screw CT low dose scanning in chest reasonable application, both may protect the patient effectively, and can guarantee the picture quality. Causes CT the application scope to be more widespread.

关 键 词：胸部 LDCT 辐射剂量 伪影 

分 类 号：R681.53[医药卫生—骨科学]