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A task-based quality control metric for digital mammography

机译：基于任务的数字乳腺X射线摄影质量控制指标

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摘要

A reader study was conducted to tune the parameters of an observer model used to predict the detectability index (d′) of test objects as a task-based quality control (QC) metric for digital mammography. A simple test phantom was imaged to measure the model parameters, namely, noise power spectrum, modulation transfer function and test-object contrast. These are then used in a non-prewhitening observer model, incorporating an eye-filter and internal noise, to predict d′. The model was tuned by measuring d′ of discs in a four-alternative forced choice reader study. For each disc diameter, d′ was used to estimate the threshold thicknesses for detectability. Data were obtained for six types of digital mammography systems using varying detector technologies and x-ray spectra. A strong correlation was found between measured and modeled values of d′, with Pearson correlation coefficient of 0.96. Repeated measurements from separate images of the test phantom show an average coefficient of variation in d′ for different systems between 0.07 and 0.10. Standard deviations in the threshold thickness ranged between 0.001 and 0.017 mm. The model is robust and the results are relatively system independent, suggesting that observer model d′ shows promise as a cross platform QC metric for digital mammography.
机译：进行了一项读者研究，以调整观察者模型的参数，该模型用于预测测试对象的可检测性指标（d'），作为数字乳房X线照片的基于任务的质量控制（QC）指标。拍摄了一个简单的测试体模，以测量模型参数，即噪声功率谱，调制传递函数和测试对象对比度。然后将这些用于非预增白的观察者模型中，并结合了眼图滤镜和内部噪声，以预测d'。该模型是通过在四项强制选择读者研究中测量光盘的d'来调整的。对于每个圆盘直径，d'用于估计可检测性的阈值厚度。使用变化的探测器技术和X射线光谱获得了六种类型的数字化乳腺摄影系统的数据。发现d'的测量值与模型值之间存在很强的相关性，皮尔森相关系数为0.96。对测试体模的单独图像进行的重复测量显示，对于不同系统，d'的平均变化系数为0.07至0.10。阈值厚度的标准偏差范围为0.001至0.017 mm。该模型是健壮的，并且结果是相对独立于系统的，这表明观察者模型d'显示了作为数字乳腺摄影的跨平台QC度量的希望。

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