Ultrasound speckle reduction using coded excitation, frequency compounding,and postprocessing despeckling filters

Joshua S. Ullom, Michael Oelze, Jose R. Sanchez

Research output: Chapter in Book/Report/Conference proceedingConference contribution


A technique for improvement of ultrasonic B-mode imaging that uses codedexcitation, pulse compression, and frequency compounding was developed. A codedexcitation and pulse compression technique known as resolution enhancementcompression (REC) was used to enhance the bandwidth of an imaging system by afactor of two. This bandwidth was subdivided into smaller subbands through thespeckle-reducing technique known as frequency compounding (REC-FC). Frequencycompounded images were generated using various subband widths and then averagedto reduce speckle and to improve contrast while preserving spatial resolution,known as enhanced REC-FC (eREC-FC). In this study, further improvements incontrast and reduction in speckle were obtained by applying post-processingdespeckling filters. The following post-processing despeckling filters wereexplored and analyzed in regard to contrast improvement, speckle reduction, andimage feature preservation: median, Lee, homogeneous mask area, geometric, andspeckle reducing anisotropic diffusion (SRAD). To quantify the performance ofeach filter, contrast-to-noise ratio was used. Data from thirty simulatedphantoms and experimental data from a tissue-mimicking phantom were generatedand filtered. Results demonstrated that post-processing despeckling filterscoupled with the eREC-FC technique could improve the image by up to 563%, interms of the contrast-to-noise ratio, when compared to conventional ultrasonicimaging.

Original languageEnglish (US)
Title of host publication2010 IEEE International Ultrasonics Symposium, IUS 2010
Number of pages4
StatePublished - 2010
Event2010 IEEE International Ultrasonics Symposium, IUS 2010 - San Diego, CA, United States
Duration: Oct 11 2010Oct 14 2010

Publication series

NameProceedings - IEEE Ultrasonics Symposium
ISSN (Print)1051-0117


Other2010 IEEE International Ultrasonics Symposium, IUS 2010
Country/TerritoryUnited States
CitySan Diego, CA


  • Coded excitation
  • contrast improvement
  • frequency compounding
  • pulse compression
  • speckle reduction
  • ultrasound

ASJC Scopus subject areas

  • Acoustics and Ultrasonics


Dive into the research topics of 'Ultrasound speckle reduction using coded excitation, frequency compounding,and postprocessing despeckling filters'. Together they form a unique fingerprint.

Cite this