| 徐辉,宛然,宋鲁新,王建超,岳保荣.乳腺计算机X射线摄影图像质量和剂量最优化研究[J].中国医学影像技术,2013,29(7):1197~1201 |
| 乳腺计算机X射线摄影图像质量和剂量最优化研究 |
| Optimization of image quality and radiation dose in CR ammography |
| 投稿时间：2012-11-13 修订日期：2013-05-09 |
| DOI： |
| 中文关键词: 乳腺数字摄影 图像后处理 辐射剂量 |
| 英文关键词:Mammography Image post-processing Radiation dosage |
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| 摘要点击次数: 3359 |
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| 中文摘要: |
| 目的 比较数字乳腺系统中手动曝光与自动曝光控制(AEC)下图像质量的差异,观察图像后处理在改善图像质量和降低受检者辐射剂量方面的作用。方法 分别选用CDMAM 3.4模体和TORMAM模体,在一套乳腺CR系统中选取5个不同厚度,每一个厚度分别为1次全自动曝光和3次手动曝光,手动曝光的剂量分别为AEC剂量的80%、60%和40%。由3名放射技师对模体影像进行2次评分,一次直接对原始图像评分;另一次对图像进行后处理以符合最佳显示条件并评分。比较手动低剂量曝光的影像与AEC曝光的影像质量的差异。结果 CDMAM 3.4模体中影像质量因子(IQF)测值表明,经过后处理的图像质量优于未处理时,部分低剂量图像的质量经过处理后优于AEC曝光剂量的图像。对于不同厚度的模体,通过手动改变曝光参数降低曝光量以及图像后处理,可降低受检者辐射剂量20%~60%。在TORMAM模体中,图像后处理对于纤维丝细节和圆形细节改善显著(P<0.001),而对于颗粒群细节无明显改善(P=0.74)。结论 乳腺CR数字摄影中,通过图像后处理可以改善图像质量,并在保持图像质量的同时降低受检者辐射剂量。 |
| 英文摘要: |
| Objective To investigate the difference of image quality between automatic exposure control (AEC) and manual exposure in CR digital mammography, and to observe the effect of image post-processing on improvement of image quality and dose reduction. Methods CDMAM 3.4 phantom and TORMAM phantom were selected and exposed in a CR system in 5 different phantom thickness. Under each thickness there were 4 dose levels (once automatic and 3 times manual exposures, which corresponded to 80%, 60% and 40% dose). Three observers interpreted all the images. Each image was scored twice with unprocessed images and post-processed image. The differences of image quality were compared between 3 lower dose images and 100% dose image. Results The results of image quality figure (IQF) of CDMAM phantom showed the image quality of post-processed images were higher than unprocessed images. Part of the lower dose images exceeded AEC dose image in image quality through post-processing. The dose decreased from 20% to 60% through image post-processing in different equivalent breast thickness. From the results of TORMAM phantom, for the detection of filament details and circular details, the scores increased after post-processing (P<0.001). However for the partical details, the effect of image post-processing on image quality was not obvious (P=0.74). Conclusion In CR digital mammography, the image quality can be improved through image post-processing. Radiation dosage can decrease through the image post-processing without reduce of image quality. |
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