| 孔祥闯,夏忠心,余建明.婴幼儿胸部DR摄影距离对体表入射剂量与图像质量的影响[J].中华放射医学与防护杂志,2011,31(6):719-721 |
| 婴幼儿胸部DR摄影距离对体表入射剂量与图像质量的影响 |
| Effects of source to image receptor distance on image quality and entrance surface dose of chest digital radiography for infants |
| 投稿时间：2011-03-01 |
| DOI：10.3760/cma.j.issn.0254-5098.2011.06.027 |
| 中文关键词: 婴幼儿 数字化X线摄影 源像距(SID) 体表入射剂量 图像质量 |
| 英文关键词:Infants Digital radiography Source to image receptor distance(SID) Entrance surface dose (ESD) Image quality |
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| 中文摘要: |
| 目的 探讨胸部数字化X线摄影源像距(SID)对婴幼儿体表入射剂量(ESD)与图像质量的影响。方法 先进行仿真胸部体模实验性曝光,采用同一管电压(60 kVp)和不同SID(150~80 cm, 10 cm为一组,共8组)进行曝光组合,记录每次曝光的毫安秒、ESD。选取试验中ESD相对剂量适中和较低的两组(110和90 cm)进行临床试验。42例接受两次胸部DR摄影平均年龄12个月(8个月~2岁)的住院婴幼儿,入院时使用110 cm的SID,出院前均使用90 cm的SID。由3位资深影像学专家对获取的84幅图像质量进行评判。结果 SID从150 cm降到80 cm,mAs和ESD也逐步递减。84例初检及复查患儿的图像质量均符合诊断要求,SID 110 和90 cm组的图像质量评分分别为4.4±0.3和4.2±0.4,两组比较差异无统计学意义(t=0.453,P>0.05)。SID 90 cm 组的 ESD 比SID 110 cm组降低了0.0034 mGy(t＝12.001,P <0.05)。结论 婴幼儿DR胸部摄影中不同SID,其体表入射剂量具有差异,且图像质量均能满足诊断要求,90 cm的SID在婴幼儿DR胸部摄影中值得提倡。 |
| 英文摘要: |
| Objective To investigate the effects of source to image receptor distance (SID) on the image quality and entrance surface dose (ESD) in the chest digital radiography (DR) for infants. Methods Anthropomorphic chest phantoms were exposed to 60 kVp and different values of SID (150-80 cm with the interval of 10 cm, totally 8 groups) so as to record the values of mAs and ESD. The SID values of 110 cm and 90 cm with the moderate and low ESD values were selected for clinical test. Forty-two hospitalized infants, aged 12 months (8 months to 2 years) underwent chest DR with the SID of 110 cm before admission and 90 cm before discharge respectively. The values of ESD were recorded and compared.Three experienced experts assessed the quality of 84 pieces of images. Results The values of mAs and ESD decreased gradually along with the decrease of the SID from 150 cm to 80 cm. All the 84 images from the 42 infants met the demands for diagnosis. There was no significant difference in the score of image quality of the group with the SID of 110 cm (4.4±0.3) and 90 cm(4.2±0.4) (t=0.453,P>0.05). The value of ESD of the group with the SID of 90 cm was significantly lower than that of the group of SID of 110 cm by 0.0034 mGy (t＝12.001,P<0.05). Conclusions The image quality of chest DR could meet the demands for diagnosis in spite of the value of SID, however, the SID value in chest DR significantly might influence the ESD.The SID value of 90 cm shoud be recommended in chest DR for infants. |
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