| ZHAO Feng,ZENG Yong-ming,PENG Gang,CAO Hui-zhi,LIAO Jing-min,YU Ren-qiang,PENG Sheng-kun,TAN Huan.Correlation between the tube current and image noise in low-dose chest CT scean[J].Chinese Journal of Radiological Medicine and Protection,2012,32(1):100-103 |
| Correlation between the tube current and image noise in low-dose chest CT scean |
| Received:June 18, 2011 |
| DOI：10.3760/cma.j.issn.0254-5098.2012.01.030 |
| KeyWords:Tube current Noise Radiation dose Tomography X-rays |
| FundProject:重庆市卫生局科研基金(08-2-29) |
| Author Name | Affiliation | E-mail | | ZHAO Feng | Department of Radiology, First Affiliated Hospital, Chongqing Medical University, Chongqing 400016, China | | | ZENG Yong-ming | Department of Radiology, First Affiliated Hospital, Chongqing Medical University, Chongqing 400016, China | zeng-ym@vip.sina.com | | PENG Gang | Department of Radiology, First Affiliated Hospital, Chongqing Medical University, Chongqing 400016, China | | | CAO Hui-zhi | GE中国CT影像研究所 | | | LIAO Jing-min | GE中国CT影像研究所 | | | YU Ren-qiang | Department of Radiology, First Affiliated Hospital, Chongqing Medical University, Chongqing 400016, China | | | PENG Sheng-kun | Department of Radiology, First Affiliated Hospital, Chongqing Medical University, Chongqing 400016, China | | | TAN Huan | Department of Radiology, First Affiliated Hospital, Chongqing Medical University, Chongqing 400016, China | |
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| Abstract:: |
| Objective To analyze the distribution of image noise in low-dose chest CT scan and optimize the relative scanning parameters. Methods The CT images of the Chinese anthropomorphic chest phantom(CDP-1C) were simulated into six groups of low-dose images with different noise indexs by using an image noise addition tool. The difference between the preset noise index and analog noise value was compared. The CT images of 20 volunteers were also simulated into nine groups of low dose scans with the tube currents of 10, 30, 50, 80, 100, 120, 150, 180 and 240 mA. The noise values of images were recorded and analyzed. Results There was no statistical difference between the analog noise value and the noise index. The image noise of low-dose chest scan was increased with the decrease of tube current. The noise was increased quickly when the current was decreased from 50 to 30 mA(F=24.09-40.79,P<0.05), but the noise increased slowly when the current decreased from 240 to 80 mA. There was no statistical difference between the noise of 80 mA group and that of 120 mA(P>0.05). Conclusions The noise addition tool can be used to evaluate the image noise of low-dose chest CT scan. Adoption of 80 mA in chest CT scan would result in low radiation dose without adding image noise. |
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