Ultrasound imaging system using combinational coded excitation

Katsunori Asafusa, Takashi Azuma, Ryuichi Shinomura, Hiroshi Kanda, Shin Ichiro Umemura

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


Increasing penetration to a deep body is one of the most important targets for clinical ultrasound imaging. To this end, coded excitation technique is known as a fundamental solution to improve signal to noise ratio (SNR) without degradation of axial resolution. In order to improve the SNR, the coded excitation requires longer pulse containing many wavelengths. However, a nonlinear characteristic of signal processing such as dynamic beam forming degrades the resolution. Decoding error tends to appear at different distances where focusing parameters vary at the long pulse decoded. In the last symposium, our group has proposed a new approach subaperture decoding to enhance performance of Coded Excitation, in which the Combinational Codes with multiple Codes with relatively small size taps are transmitted and then received signals are decoded with these Combinational Codes. In other words, this approach's transmission combines and compounds two or more codes of relatively small code length, and decoding processes divide into two or more decoding filters correspond to each code. In this report, we report more detailed simulation and preliminary experimental results for this approach of Combinational Coded Excitation. Using this new Coding approach, higher SNR without degrading lateral resolution is achieved In the case of 3 × 5 codes, the combinational coding technique improves SNR up to 11.4dB experimentally and this result is relatively coincidence with calculated value (11.5dB).

Original languageEnglish
Title of host publicationProceedings - 2004 IEEE Ultrasonics Symposium
Subtitle of host publicationA Conference of the IEEE International Ultrasonics, Ferroelectrics, and Frequency Control Society, UFFC-S
EditorsM.P. Yuhas
Number of pages4
Publication statusPublished - 2004 Dec 1
Event2004 IEEE Ultrasonics Symposium - Montreal, Que., Canada
Duration: 2004 Aug 232004 Aug 27

Publication series

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


Other2004 IEEE Ultrasonics Symposium
CityMontreal, Que.


  • Combinational Code
  • Component

ASJC Scopus subject areas

  • Acoustics and Ultrasonics


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