Title :
On the method-independent lower bound (MILB) to the variance of attenuation estimation in random reflection
Author :
Liu, Dong-lai ; Ikeda, Kenji ; Saito, Masao
Author_Institution :
Inst. of Med. Electron., Tokyo Univ., Japan
fDate :
3/1/1990 12:00:00 AM
Abstract :
Based on the Cramer-Rao inequality, the MILB is calculated for the problem of estimating the frequency slope of the attenuation coefficient of tissue from random reflections of ultrasonic waves. Under typical signal conditions, this bound for a 1-cm×1-cm region was found to be about 0.08 db/(MHz-cm), rather close to the clinical requirement of 0.1 dB/(MHz-cm). Comparison to existing methods (including an autoregressive deconvolution method) shows room for further improvement
Keywords :
bioacoustics; ultrasonic absorption; ultrasonic reflection; US waves; autoregressive deconvolution method; bioacoustics; method-independent lower bound; random reflection; signal conditions; tissue; tissue attenuation coefficient variance; Attenuation; Biological tissues; Deconvolution; Frequency estimation; Helium; RF signals; Radio frequency; Reflection; Stochastic processes; Time domain analysis;
Journal_Title :
Medical Imaging, IEEE Transactions on
