| 王鹏程,张富利,李士俊.两种数字化X射线摄影技术影像质量与成像剂量的比较[J].中华放射医学与防护杂志,2005,25(1):91-93 |
| 两种数字化X射线摄影技术影像质量与成像剂量的比较 |
| Comparison between two different digital radiographic techniques:image quality versus imaging dose |
| 投稿时间：2004-04-24 |
| DOI： |
| 中文关键词: 数字化X射线摄影 影像质量 X射线剂量 |
| 英文关键词:Digital radiography Image quality |
| 基金项目: |
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| 摘要点击次数: 2931 |
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| 中文摘要: |
| 目的 对比研究非晶硒平板探测器直接数字化X射线摄影(DR)及计算机X射线摄影(CR)两种数字化X射线摄影技术影像质量与吸收剂量的关系。方法 应用DR和CR系统分别对对比度细节体模(CDRAD2.0)进行不同吸收剂量的曝光成像。记录每次曝光的体模表面吸收剂量,并将所获取的影像在图像诊断工作站显示器上由4位观片者进行观察,计算影像质量表征因子(IQF)。应用ANOVA检验法统计、比较两种数字化摄影技术的图像质量与吸收剂量的差别。结果 与CR相比,DR具有更低的IQF值,对人体组织对比度和结构细节有更好的信息检出特性。两种成像技术产生相同IQF值时,DR系统在体模表面产生的表面剂量比CR系统降低了77%。结论 DR技术对于低对比度组织细节的检测好于CR技术。在获得相同影像信息的前提下,与CR相比应用DR大大降低了被检者吸收剂量。 |
| 英文摘要: |
| Objective To assess and compare the difference in image quality and exposure dose between an amorphous selenium flat panel digital radiography(DR) system and computed radiography(CR). Methods A contrast-detail phantom CDRAD2.0 was exposed by DR and CR with different mAs sets.The entrance surface doses were recorded for all images.Images were presented to 4 independent observers on a higher resolution monitor of diagnosis work station.The image quality figure(IQF)was measured for each image.Statistical analysis was performed using ANOVA test to compare the difference in image quality and exposure dose between DR and CR. Results Comparing to CR,DR had a lower IQF,ensuring a high image quality with respect to contrast and detail detectability.When IQFs for DR and CR were equal,DR could reduce the surface dose by 77% of that of CR. Conclusion Image quality of DR has been proved to be far superior to CR,in particular for contrast-detail.The image quality of CR is similar to that of DR only at very high dose levels.The clinical application of DR will reduce the exposure dose to the patient greatly. |
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