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Characterization of the effects of the FineView algorithm for full field digital mammography

机译：表征FineView算法对全场乳腺X线摄影的效果

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The aim of this study was to characterize the effect of an image processing algorithm (FineView) on both quantitative image quality parameters and the threshold contrast detail response of the GE Senographe DS full-field digital mammography system. The system was characterized using signal transfer property, pre-sampling modulation transfer function (MTF), normalized noise power spectrum (NNPS) and detective quantum efficiency (DQE) of the system. An algorithmic modulation transfer function (MTF a) was calculated from images acquired at a reduced detector air kerma (DAK) and with the FineView algorithm enabled. Two sets of beam conditions were used: Mo/Mo/28 kV and Rh/Rh/29 kV, both with 2 mm added Al filtration at the x-ray tube. Images were acquired with and without FineView at four DAK levels from 14 to 378νGy. The threshold contrast detail response was assessed using the CDMAM contrastdetail test object which was imaged under standard clinical conditions with and without FineView at three DAK levels from 24 to 243 νGy. The images were scored by both human observers and by automated scoring software. Results indicated an improvement of up to 125% at 5 mm 1in MTF awhen FineView was activated, particularly at high DAK levels. A corresponding increase of up to 425% at 5 mm 1was also seen in the NNPS, again with the same DAK dependence. FineView did not influence DQE, an indication that the signal to noise ratio transfer of the system remained unchanged. FineView did not affect the threshold contrast detectability of the system, a result that is consistent with the DQE results.
机译：这项研究的目的是描述图像处理算法（FineView）对定量图像质量参数和GE Senographe DS全视野数字化乳腺摄影系统的阈值对比度细节响应的影响。利用系统的信号传递特性，预采样调制传递函数（MTF），归一化噪声功率谱（NNPS）和检测量子效率（DQE）对系统进行了表征。根据在减少的检测器空气比释动能（DAK）处获取的图像并启用FineView算法，计算出算法调制传递函数（MTF a）。使用了两组射束条件：Mo / Mo / 28 kV和Rh / Rh / 29 kV，均在X射线管上添加了2 mm的Al过滤。使用和不使用FineView在14至378νGy的四个DAK级别上获取图像。使用CDMAM对比度细节测试对象评估阈值对比度细节响应，该对象在标准临床条件下使用和不使用FineView在24至243 vGy的三个DAK水平下成像。图像由人类观察者和自动评分软件评分。结果表明，激活FineView时，MTF在5 mm 1处提高了多达125％，特别是在DAK水平较高的情况下。在NNPS中也看到了在5 mm 1处相应增加高达425％的情况，同样具有相同的DAK依赖性。 FineView不会影响DQE，这表明系统的信噪比传递保持不变。 FineView不会影响系统的阈值对比度可检测性，这一结果与DQE结果一致。

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