Rhyne T L, Sagar K B
Research and Development, Marquette Electronics Inc., Milwaukee, Wisconsin 53223.
Ultrason Imaging. 1990 Jul;12(3):189-204. doi: 10.1177/016173469001200303.
Various methods have been developed to measure the coefficient of volume backscatter. For these measures, correction has made for signal energy, instrumentation/transducer filtration, diffraction and bulk loss, while using various square law or log magnitude detectors. Also, tissue backscatter has been measured as a function of frequency and the statistics of the backscatter has been examined. This paper unites methods of measuring a properly scaled (unbiased) estimate of the backscatter coefficient with knowledge of the scattering statistics and frequency response using statistical communications techniques. The maximum likelihood, minimum variance, unbiased estimator for wideband measurement of backscatter is developed together with its performance. The measurement technique has strong implications for system design for measuring cyclic myocardial backscatter.
已经开发出多种方法来测量体积反向散射系数。对于这些测量方法，在使用各种平方律或对数幅度探测器时，已对信号能量、仪器/换能器滤波、衍射和体积损耗进行了校正。此外，还测量了组织反向散射与频率的函数关系，并研究了反向散射的统计特性。本文运用统计通信技术，将测量反向散射系数的适当缩放（无偏）估计的方法与散射统计知识和频率响应相结合。开发了用于宽带反向散射测量的最大似然、最小方差、无偏估计器及其性能。该测量技术对测量周期性心肌反向散射的系统设计具有重要意义。
