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Related Concept Videos

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Cardiac imaging studies encompass a wide range of noninvasive and minimally invasive techniques designed to visualize the heart's structure and function in detail. One such technique is echocardiography, which uses high-frequency ultrasound waves to produce detailed images of the heart, known as echocardiograms.
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Coded excitation for diverging wave cardiac imaging: a feasibility study.

Feifei Zhao1, Ling Tong1, Qiong He1

  • 1Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing 100084, People's Republic of China.

Physics in Medicine and Biology
|January 12, 2017
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Summary
This summary is machine-generated.

Coded excitation significantly improves signal-to-noise ratio (SNR) and penetration depth in diverging wave (DW) cardiac imaging. This technique enhances image quality for both non-compounded and compounded DW imaging schemes.

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Area of Science:

  • Medical Imaging
  • Ultrasound Technology
  • Biomedical Engineering

Background:

  • Diverging wave (DW) imaging offers ultrahigh frame rates but suffers from low signal-to-noise ratio (SNR), contrast, and penetration depth.
  • Coded excitation is a known method to enhance SNR and penetration in ultrasound imaging.

Purpose of the Study:

  • To evaluate the feasibility of applying coded excitation to DW imaging.
  • To improve SNR, contrast, and penetration depth in DW B-mode images.

Main Methods:

  • Tested linear frequency modulated chirp codes and complementary Golay codes.
  • Investigated three DW imaging schemes: 1-angle non-compounded, 3-angle compounded, and 5-angle compounded.
  • Compared coded excitation with regular pulsed excitation and conventional focused imaging via simulations and in vitro experiments.

Main Results:

  • Coded excitation improved SNR by approximately 10 dB.
  • Penetration depth increased by 2.5 cm (chirp code) and 1.8 cm (Golay codes).
  • Contrast ratio (CR) and contrast-to-noise ratio (CNR) gains varied with depth and compounding, with notable improvements in non-compounded schemes.

Conclusions:

  • Coded excitation is feasible for enhancing DW imaging quality.
  • Demonstrated improved SNR and penetration depth in preliminary in vivo cardiac images.
  • Coded excitation offers a promising approach to overcome limitations in DW cardiac imaging.