Alam S K, Ophir J
Radiology Department, University of Texas Medical School, Houston 77030, USA.
Ultrasound Med Biol. 1997;23(9):1427-33. doi: 10.1016/s0301-5629(97)00186-5.
Bamber and Bush (1995) used the correlation coefficient for freehand elasticity imaging. Varghese and Ophir (1996) found it to be a biased estimator of strain with a large variability. In this study, we systematically investigate the effect of changes in various system and processing parameters on the performance of the correlation coefficient strain estimator, and demonstrate, using simulated data, that noise and frequency-dependent attenuation can introduce variable bias in this estimator.
班伯和布什（1995年）将相关系数用于徒手弹性成像。瓦尔盖斯和奥菲尔（1996年）发现它是应变的一个有偏差的估计量，且变异性很大。在本研究中，我们系统地研究了各种系统和处理参数的变化对相关系数应变估计量性能的影响，并使用模拟数据证明，噪声和频率相关衰减会在该估计量中引入可变偏差。
