Evaluation of a quality control phantom for digital chest radiography.
Evaluation of a quality control phantom for digital chest radiography.
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DOI：
10.1120/1.1364176
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发表时间：
2001-01-01
影响因子：
2.1
通讯作者：
Peck, D J
中科院分区：
文献类型：
--
作者：
Mah, E;Samei, E;Peck, D J
依据和目标：为了检查的有效性和适用性的质量控制（QC）幻影的常规QC程序在digital radiography.MATERIALS和METHODS：胸部幻影由铜和铝的切口，安排类似的外观胸部。使用放置在体模“心脏”、“肺”和“横膈下”区域的高对比度和低对比度分辨率对象评价数字X射线摄影（DR）系统的性能。此外，将这些区域的信号水平与临床胸片中的类似区域进行比较。结果：体模中包含的测试对象可有效评估图像质量，但隔膜下区域除外，该区域的大部分低对比度圆盘均可见。使用体模评价的DR系统的空间分辨率范围为2.6 lp/mm至4 lp/mm，在提供的线对范围的中间。体模的心脏和膈肌区域相对于肺部区域的信号水平显著高于临床胸片（心脏和膈肌区域分别为0.67 vs 0.21和0.28 vs 0.10）。然而，心脏与隔膜的信号电平比，是可比的那些在临床radiographs.CONCLUSION：研究结果表明，该幻影的衰减特性有些不同，从实际的胸部，但这似乎并没有影响后处理所使用的成像系统和有用性，这些系统的QC。不同系统的体模的定性和定量测量结果相似，表明单个体模可用于在各种数字X射线摄影系统的常规QC程序中评价系统性能。这使得混合使用不同数字X射线摄影系统的机构更容易实施统一的QC计划。
RATIONALE AND OBJECTIVES: To examine the effectiveness and suitability of a quality control (QC) phantom for a routine QC program in digital radiography.MATERIALS AND METHODS: The chest phantom consists of copper and aluminum cutouts arranged to resemble the appearance of a chest. Performance of the digital radiography (DR) system is evaluated using high and low contrast resolution objects placed in the "heart," "lung," and "subdiaphragm" areas of the phantom. In addition, the signal levels from these areas were compared to similar areas from clinical chest radiographs.RESULTS: The test objects included within the phantom were effective in assessing image quality except within the subdiaphragm area, where most of the low contrast disks were visible. Spatial resolution for the DR systems evaluated with the phantom ranged from 2.6 lp/mm to 4 lp/mm, falling within the middle of the line pair range provided. The signal levels of the heart and diaphragm regions relative to the lung region of the phantom were significantly higher than in clinical chest radiographs (0.67 versus 0.21 and 0.28 versus 0.10 for the heart and diaphragm regions, respectively). The heart-to-diaphragm signal level ratio, however, was comparable to those in clinical radiographs.CONCLUSION: The findings suggest that the attenuation characteristics of the phantom are somewhat different from actual chests, but this did not appear to affect the post-processing used by the imaging systems and usefulness for QC of these systems. The qualitative and quantitative measurements on the phantom for different systems were similar, suggesting that a single phantom can be used to evaluate system performance in a routine QC program for a wide range of digital radiography systems. This makes the implementation of a uniform QC program easier for institutions with a mixture of different digital radiography systems.