Evaluation of Acoustic Imaging System Using Correlation Division in Synthetic Transmit Aperture with Multicarrier Signals
スポンサーリンク
概要
- 論文の詳細を見る
This paper presents and evaluates a new acoustic imaging system that uses multicarrier signals for correlation division in synthetic transmit aperture (CD-STA). CD-STA is a method that transmits uncorrelated signals from different transducers simultaneously to achieve high-speed and high-resolution acoustic imaging. In CD-STA, autocorrelations and cross-correlations in transmitted signals must be suppressed because they cause artifacts in the resulting images, which narrow the dynamic range as a consequence. To suppress the correlation noise, we had proposed to use multicarrier signals optimized by a genetic algorithm. Because the evaluation of our proposed method was very limited in the previous reports, we analyzed it more deeply in this paper. We optimized three pairs of multicarrier waveforms of various lengths, which correspond to 5th-, 6th- and 7th-order M-sequence signals, respectively. We built a CD-STA imaging system that operates in air. Using the system, we conducted imaging experiments to evaluate the image quality and resolution of the multicarrier signals. We also investigated the ability of the proposed method to resolve both positions and velocities of target scatterers. For that purpose, we carried out an experiment, in which both moving and fixed targets were visualized by our system. As a result of the experiments, we confirmed that the multicarrier signals have lower artifact levels, better axial resolution, and greater tolerance to velocity mismatch than M-sequence signals, particularly for short signals.
論文 | ランダム
- SY-3-9 直腸肛門管癌に対するISRの適応 : 経肛門操作を先行させた術式の観点から(シンポジウム3 直腸肛門管癌に対するISRの適応と手技,第64回日本消化器外科学会総会)
- Gilbert症候群を伴った直腸癌肺転移に対するFOLFOX療法
- 男性不妊症の評価におけるSperm Penetration Assayの有用性に関する検討
- In Vitroにおけるヒト精子受精能獲得の検討
- ヒト先体反応精子のscoringに対するflow cytometryの応用