| XIE Na,GAN Yun-gen,WANG Hong-wei,et al.Objective factors affecting the image quality of low-dose cranial CT of infant[J].Chinese Journal of Radiological Medicine and Protection,2010,30(4):472-474 |
| Objective factors affecting the image quality of low-dose cranial CT of infant |
| Received:March 25, 2010 |
| DOI：10.3760/cma.j.issn.0254-5098.2010.04.029 |
| KeyWords:Tomography, X-ray computed Radiation dose Head Infant |
| FundProject:深圳市科技局科技计划基金资助项目(200304193) |
| Author Name | Affiliation | | XIE Na | Department of Radiology, Shenzhen Children's Hospital, Shenzhen 518026, China | | GAN Yun-gen | Department of Radiology, Shenzhen Children's Hospital, Shenzhen 518026, China | | WANG Hong-wei | Department of Radiology, Shenzhen Children's Hospital, Shenzhen 518026, China | | ZENG Hong-wu | Department of Radiology, Shenzhen Children's Hospital, Shenzhen 518026, China | | CAO Wei-guo | Department of Radiology, Shenzhen Children's Hospital, Shenzhen 518026, China | | SUN Long-wei | Department of Radiology, Shenzhen Children's Hospital, Shenzhen 518026, China |
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| Abstract:: |
| Objective To investigate the objective factors that affect the image quality of infant cranial CT using different mAs.Materials and Methods Ninety infants were divided into three groups randomly.The maximum anteroposterior diameter (MAPD) of skull of each infant was measured. Three reference levels, cerebellar, basal ganglia and centrum semiovale levels were selected respectively. Only one level was studied in each group and scanned with 150, 100 and 80 mAs. The subjective quality grade and the objective noise of all images were recorded and analysed statistically. Result The average MAPD of ninety patients was (148.0±17.4)mm. On the cerebellar level, the subjective quality grade was lower than the other two levels, which were 6.3%, 9.4% and 22.9% respectively when mAs were 150, 100 and 80 mAs. Both quality grade of image and objective noise were significantly correlated with MAPD. Conclusion The inherent high noise of cerebellar level and MAPD were the objective factors that affect the image quality of low-dose cranial CT of infant. |
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