SPECKLE REDUCTION IN PULSE ECHO ULTRASONIC-IMAGING USING A 2-DIMENSIONAL RECEIVING ARRAY

被引:6
作者
GIESEY, JJ
CARSON, PL
FITTING, DW
MEYER, CR
机构
[1] UNIV MICHIGAN HOSP,DEPT RADIOL,ANN ARBOR,MI 48109
[2] NATL INST STAND & TECHNOL,DIV MAT RELIABIL,BOULDER,CO 80303
关键词
D O I
10.1109/58.139111
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
An experimental pulse-echo imager was developed for the purpose of reducing speckle in ultrasonic images. The system utilized a 64 element spherically focused segmented annuli array receiver with a common transmitter. Compounded images were formed using subapertures of varying size, shape and overlap, and the speckle and resolution characteristics of the final images observed. A point-like scatterer was imaged to determine the resolution, point spread function and sensitivity of the system along with a new measure called the resolution cell size. The response of the system was also simulated for comparisons. Images were made of a uniformly scattering material to determine the speckle signal-to-noise ratio, the speckle spot size and a measure of image quality, the normalized contrast-to-speckle ratio. Lateral resolution and resolution cell sizes only gradually increased with a decrease in subaperture size and system sensitivity was not greatly diminished. Incoherent summation of signals from small groups of elements, as compared to coherent summation, decreased the speckle noise by a factor of four while maintaining enough resolution to improve the image quality as measured by the CSR/d by a factor of almost two. The subaperture shape and orientation of overlap were also found to be significant.
引用
收藏
页码:167 / 173
页数:7
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