IMAGE QUALITY INDEX (IQI) FOR SCREEN FILM MAMMOGRAPHY
IMAGE QUALITY INDEX (IQI) FOR SCREEN FILM MAMMOGRAPHY
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DOI：
10.1088/0031-9155/36/1/003
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发表时间：
1991-01-01
影响因子：
3.5
通讯作者：
VALLEY, JF
中科院分区：
文献类型：
--
作者：
DESPONDS, L;DEPEURSINGE, C;VALLEY, JF
用于评价乳房X线摄影中的图像质量的合适的量是对象的最小可见尺寸。 这个量，称为图像质量指数（IQI），可以从基本的图像参数：对比度，MTF，Wiener频谱中导出。 几种评价方法的像质指数，都是基于统计决策理论，已被认为是。 一个实验的能见度测试，使用模拟的微钙化已经进行，以比较不同的像质计模型所获得的结果。 以前的方法，基于简化的假设，产生了良好的相关性与可见性测试，但未能预测的实际大小的可见对象。 改进的模型已经推导出一个理想的观察者和一个“准理想”的完美或逼真的视觉特性。 实验的视觉结果是很好的模拟的IQI方法，提供了一个合适的阈值信噪比用于这些模型中的每一个。
A suitable quantity for evaluating the image quality in mammography is the smallest visible size of an object. This quantity, called the image quality index (IQI), can be derived from the basic image parameters: contrast, MTF, Wiener spectrum. Several evaluation methods of the IQI, all based on statistical decision theory, have been considered. An experimental visibility test using simulated microcalcifications has been performed in order to compare the results obtained with different IQI models. A previous approach, based on simplifying assumptions, yields a good correlation with the visibility test but fails to predict the actual size of the visible objects. Improved models have been derived for an ideal observer and for a 'quasi-ideal' one with perfect or with realistic visual characteristics. The experimental visual results are well modelled by the IQI method, provided that a suitable threshold signal-to-noise ratio is used for each of these models.