...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Digital Imaging >Influence of Image Metrics When Assessing Image Quality from a Test Object in Cardiac X-ray Systems
【24h】

Influence of Image Metrics When Assessing Image Quality from a Test Object in Cardiac X-ray Systems

机译：在心脏X射线系统中评估测试对象的图像质量时图像度量的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Modern fluoroscopic systems used for invasive cardiology typically acquire digital images in a 1,024 × 1,024 × 12 bits. These images are maintained in the original format while they remain on the imaging system itself. However, images are usually stored using a reduced 512 × 512 × 8-bits format. This paper presents a method for digital analysis of test objects images. The results obtained using image-intensifier and flat-detector systems are given for the original and reduced matrices. Images were acquired using a test object (TO) and a range of polymethyl methacrylate (PMMA) thicknesses from 4 to 28 cm. Adult patient protocols were evaluated for 16–28 cm of PMMA using the image-intensifier system. Pediatric protocols were evaluated for 4–16 cm of PMMA using the flat-detector system. The TO contains disks of various thicknesses to evaluate low contrast sensitivity and a bar pattern to evaluate high-contrast spatial resolution (HCSR). All available fluoroscopic and cine modes were evaluated. Entrance surface air kerma was also measured. Signal-to-noise ratio (SNR) was evaluated using regions of interest (ROI). HCSR was evaluated by comparing the statistical analysis of a ROI placed over the image of the bar pattern against a reference ROI. For both systems, an improvement of approximately 20% was observed for the SNR on the reduced matrices. However, the HCSR parameter was substantially lower in the reduced metrics. Cardiologists should consider the clinical influence of reduced spatial resolution when using the archived images.
机译：用于侵入性心脏病的现代荧光检查系统通常以1,024×1,024×12位来获取数字图像。这些图像保留在成像系统本身上时仍保持原始格式。但是，通常使用缩小的512×512×8位格式存储图像。本文提出了一种对测试对象图像进行数字分析的方法。对于原始矩阵和简化矩阵，给出了使用图像增强器和平面检测器系统获得的结果。使用测试对象（TO）和一系列厚度为4至28 cm的聚甲基丙烯酸甲酯（PMMA）采集图像。使用图像增强系统对成年患者的PMMA评估方案为16–28 cm。使用平板探测器系统评估了4-16 cm PMMA的儿科方案。 TO包含各种厚度的光盘以评估低对比度灵敏度，而条形图则用于评估高对比度空间分辨率（HCSR）。评估了所有可用的透视和电影模式。还测量了入口表面空气比释动能。使用感兴趣区域（ROI）评估信噪比（SNR）。通过将放置在条形图案图像上的ROI的统计分析与参考ROI的统计分析进行比较来评估HCSR。对于这两个系统，在简化矩阵上的SNR均提高了约20％。但是，在降低的指标中，HCSR参数明显较低。心脏病专家在使用存档图像时应考虑空间分辨率降低的临床影响。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号