中国医疗设备2024，Vol.39Issue(8)：20-24,5.DOI:10.3969/j.issn.1674-1633.2024.08.003
CT扫描中非标准定位像对图像质量和辐射剂量影响的模体研究
Phantom Study on the Impact of Non-Standard Localizer Radiograph on Image Quality and Radiation Dose in CT Scanning
摘要
Abstract
Objective To investigate the impact of non-standard localizer radiographs on the image quality and radiation dose of spiral CT scans through phantom experiments.Methods A standard localizer radiograph including the phantom was utilized for scanning the phantom and obtaining baseline group images,followed by a non-standard localizer radiograph containing the phantom and syringe to scan the phantom for non-baseline group images.The quality parameters of the two groups of images were compared including noise,linear CT value(3 materials:Teflon,LDPE,Air),density resolution and spatial resolution.Additionally,dose-related parameters between the two scanning protocols including effective milliampere seconds(eff.mAs)and CT dose index volume(CTDIvol)were compared.Results The comparison of noise in baseline group was lower than that in non-baseline group(P<0.05).Regarding CT value linearity,the baseline group showed a closer alignment to the standard CT value than the non-baseline group(P<0.05).In terms of density resolution,the baseline group significantly outperformed the non-baseline group in identifying the smallest diameter of the hole array(P<0.05).The difference was not statistically significant in spatial resolution between the two image groups(P>0.05).In the comparison of scanning protocols between the two groups,the eff.mAs and CTDIvol were higher in the non-baseline group than in the baseline group(all P<0.05).Conclusion Using standard localizer radiographs in spiral CT scans can achieve image quality requirements with lower radiation doses.The use of non-standard positioning images not only increases the radiation dose,but also damages the image quality.关键词
螺旋CT扫描/模体成像/图像质量/辐射剂量Key words
spiral CT scan/imaging phantom/image quality/radiation dose分类
预防医学引用本文复制引用
卞红丽,胡梅,孙小磊,陈骥梁,张久楼,徐露露..CT扫描中非标准定位像对图像质量和辐射剂量影响的模体研究[J].中国医疗设备,2024,39(8):20-24,5.基金项目
国家自然科学基金(62101278). （62101278）
