| CT低剂量扫描的探讨 |
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| 引用本文： | 周小兵,王德杭. CT低剂量扫描的探讨[J]. 中国医学装备, 2011, 8(7): 36-38 |
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| 作者姓名： | 周小兵 王德杭 |
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| 作者单位： | 南京医科大学第一附属医院放射科,江苏,南京,210029 |
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| 摘 要： | 目的:用西门子Volume Zoom CT机扫描CT模体与人体,探讨降低常规CT扫描剂量的可能性。方法:扫描CT模体,用120kV,mAs在260～180(每次递减20)。共5次。再对50例患者随机分为5组,用120kV,mAs在260～180(每次递减20),进行头颅CT扫描,扫描图像由3名高年资放射诊断医师进行盲审,结果与模体扫描结果进行对比分析。结果:当头颅CT扫描时,mAs由260降至220时,CT剂量指数由62.4降为52.8,降幅16%,两者差异有统计学意义,而图像质量无明显下降,但头颅CT扫描的mAs达到180时,图像噪声大,影响诊断,与模体扫描结果相关。结论:在降低mAs值得情况下,受检者所接受的X线剂量明显减少,在本CT机上,头颅扫描在200mAs以上的图像质量可以满足诊断要求。
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| 关 键 词： | CT模体 CT剂量指数 影像质量 低剂量 |
Investigation on low-dose CT scanning |
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| ZHOU Xiao-bing,WANG De-hang. Investigation on low-dose CT scanning[J]. China Medical Equipment, 2011, 8(7): 36-38 |
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| Authors: | ZHOU Xiao-bing WANG De-hang |
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| Affiliation: | ZHOU Xiao-bing,WANG De-hang Department of Radiology,the First Affiliated Hospital,Nanjing Medical University,Nanjing 210029,China. |
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| Abstract: | Objective:To investigate the possibility of low dose CT scanning for Catphan 500 phantom and patients' heads by Volume Zoom CT scanner (Siemens,Germany). Methods:Catphan 500 phantom was scanned for five times by Volume Zoom CT scanner with same tube voltage 120 KV and different tube currents from 180 mAs to 260 mAs with increment of 20 mAs. 50 patients undergoing head CT scan were enrolled into five groups with same scanning protocols as Catphan 500 phantom (same tube voltage 120 KV and different tube curre... |
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| Keywords: | Catphan 500 phantom Computed tomography dose index Image quality Low dose |
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